Document Number: 30722-000-002
PTC-2124
DOS Software
Guide
Chapter 3 Configuring TN-3270/5250
PTC-2124
DOS Software Software Guide
Document Number: 30722-000-002
Release Date: November 2000
Chapter 3 Configuring TN-3270/5250
Symbol is a registered trademark of Symbol Technologies, In c.
Windows 95 and Microsoft are r egistered trademarks
of the Microsoft Corporation.
All other product or trade references appearing in this manual are registered
trademarks of their respective owners.
The information in this manual is subjectto changewithout notice.
Symbol Technologies shall not be liable for technical or editorial omissions or
mistakes in this manual. Nor shall it be liable for in cidental or consequential
damages resulting from the use of the information contained in this manual.
This manual is copyrighted. No part of this manual may be photocopied or
reproduced in any form without the prior written consent of Symbol.
Technical Writer: Norm Walters
© Copyright 2000 Symbol Technologies, Inc.
All rights reserved.
This Guide’s Purposeand Scope
Introduction
This Guide’s Purpose and Scope
This manual was written by the Symbol Technical
Publications Group. This group is tasked with
providing technical documentation for the Symbol
PTC-2124 product line that uses the Microsoft®
Windows CE® Operating System. Ev ery effort has
been made to provide accurate and concise information
to you, our customer.
The PTC-2124 DOS Software Guide pr ovides
information that allows the use r to set up and use the
PTC-2124. This manual is meant to provide
information on the various components of this
product, including
• General regulations,
• Overview of the PTC-2124,
• Maintenance and trouble shooting,
• Available accessories.
This manual, h owever, does not provide instructions
on how to perform t he tasks specific to your job within
your organization. For job-specific information, refer to
the instructions provided b y your organization.
PTC-2124 DOS Software Guide i
Chapter 3 Configuring TN-3270/5250
Contacting Symbol’s Support Center
Symbol’s Support Center may be contacted to obtain
help in resolving any PTC-21 24 system problem that
you may experience.
If you have a problem running your unit or using your
equipment, contact your facility’s technical or system
support. If there is a problem with the equipment, the
system s upport willcontact the Symbol Support
Center at 1-800-653-5350.
For additional information on Sym bol’s products and
services, please visit our website at
www.symbol.com.
ii PTC-2124 DOS Software Guide
Table of Contents
Introduction..................................................................................... i
This Manual’s Purpose and Scope.................................................. i
Contacting Symbol's Product Support Center............................... i
PTC-2124 O verview ........................................................................ 1
Functional Overview....................................................................... 2
BIOS ............................................................................................. 2
Operating System ........................................................................ 3
Application ................................................................................... 3
Other Software Components .......................................................... 4
SoftwareKernel ........................................................................... 4
PenRight! Operating Environment............................................. 4
Power Management..................................................................... 4
SoftwareDevelopment Kits......................................................... 5
PTC-2124 U nit Configurations ..................................................... 6
Radio Options.................................................................................. 7
Batch............................................................................................. 7
LAN Radio Ready......................................................................... 7
WAN Radio Factory Installed..................................................... 7
Memory............................................................................................ 8
RAM.............................................................................................. 8
ROM .............................................................................................. 8
Storage Options............................................................................... 8
ATA............................................................................................... 8
SRAM............................................................................................ 8
Compact Flash.............................................................................. 9
PCMCIA Slots.................................................................................. 9
External Slots............................................................................... 9
Display............................................................................................. 9
IrDA ................................................................................................. 10
Ethernet........................................................................................... 10
DCD Devices.................................................................................... 10
Scanners....................................................................................... 10
PTC-2124 DOS Software Guide iii
PTC-2124 A ssignments .................................................................. 11
Resource Map .................................................................................. 12
Memory Allocation Table ............................................................. 12
Hardware Interrupts....................................................................... 13
InterruptTable............................................................................. 13
COM Port Assignments .................................................................. 14
Boot Options..................................................................................... 15
POST................................................................................................ 16
What Happens During POST...................................................... 16
Changing BIO S S ettings ................................................................. 17
Boot Sources and Drive Letter Mapping........................................ 18
Normal Boot ................................................................................. 18
Booting from an ATA Card.......................................................... 19
Booting from an SRAM Card....................................................... 20
Reflashing the BIOS....................................................................... 23
TFLASH Utility ...................... ..................................................... 23
Automatic Genesis Flash............................................................. 25
Resetting/Rebooting the PTC-2124 ................................................ 26
Cold Reboot................................................................................... 26
Console Reboot............................................................................. 26
Power Management........................................................................ 28
APM ................................................................................................. 28
Monitoring....................................................................................... 29
APM Driver...................................................................................... 29
POWER.EXE................................................................................ 29
Command Line Parameters......................................................... 29
Power Management S tates............................................................. 31
Magic Packet Mode ...................................................................... 32
Features of Power Management in the Standby State.............. 33
Features of Power Management in the Suspend State.............. 34
SC 400 Power Control Flow............................................................ 35
iv PTC-2124 DOS Software Guide
Driver Su pport ................................................................................ 36
Cradle Information......................................................................... 37
Cradle O verview.............................................................................. 37
PTC-2124 Cradle Interactio n ......................................................... 38
Cradle Serial Interface ................................................................ 39
DTR and RTS Latching ............................................................... 41
Ring Indicator .............................................................................. 41
DB-9 Serial Connector Pinout..................................................... 41
Ethernet Port ............................................................................... 42
KeyboardPort .............................................................................. 43
Crad TSR Overview......................................................................... 44
Invoking CradTSR ....................................................................... 44
Specifying Interrupt Vector......................................................... 45
Binary Interface of CradTSR....................................................... 45
Command Line Arguments ......................................................... 46
SCRNBLNK....................................................................................... 48
Purpose............................................................................................ 48
User Interface Functions................................................................ 48
Reject Standby (/r option)............................................................ 48
Time-out (/t option) ...................................................................... 49
Unload (/u option) ........................................................................ 4 9
Vector (/v option).......................................................................... 49
TSR Internal Functions.................................................................. 50
Events........................................................................................... 50
INIT State .................................................................................... 50
SBL_ON State.............................................................................. 50
SBL_OFF State............................................................................ 50
INACTIVE State.......................................................................... 51
Standby/Suspend/Resume........................................................... 5 1
State Machine .............................................................................. 51
PTC-2124 DOS Software Guide v
Ethernet Power Management...................................................... 52
Cradle TSR Function ...................................................................... 52
Ethernet Drivers/Utilities................... .. .......................................... 53
Installing Ethernet Drivers......................................................... 53
ETHERCTL.EXE......................................................................... 53
TEP.COM ..................................................................................... 53
ETHERNET.BAT ......................................................................... 54
IrDA.................................................................................................... 55
IrDA Power Management............................................................... 55
JIRDAON.EXE............................................................................. 5 5
JIRDAOFF.EXE........................................................................... 55
LP20.EXE..................................................................................... 55
LitePlus 2.0 IrDA Print Driver ................................................... 55
LitePlus 2.0 IrDA DOS D river Architecture.............................. 56
IrDA Related Specification.......................................................... 56
IrDA Compatibility ...................................................................... 62
DOS BIOS INT17H Function Extension.................................... 62
DOS BIOS INT14H Function Extension.................................... 64
Miscellaneous............................................................................... 7 5
Discussions................................................................................... 79
NTMOUSE ......................................................................................... 80
What is NTMOUSE?.................................................................... 80
Pencal ........................................................................................... 81
Using NTM OUSE ........................................................................ 81
NTMOUSE Interaction with APM.............................................. 82
Special Notes for Programmers................................................... 83
2124POP ............................................................................................ 84
Command Line............................................................................. 84
Options.......................................................................................... 84
PENCAL ............................................................................................ 86
What is PENCAL?........................................................................... 86
Why Use PENCAL?......................................................................... 87
Using PENCAL ............................................................................... 88
PENCAL Usage Notes .................................................................... 90
vi PTC-2124 DOS Software Guide
PenRight!.......................................................................................... 91
PenRight! Overview ........................................................................ 9 1
Features........................................................................................... 91
MobileBuilder............................................................................... 93
System Requirements.................................................................. 94
Installation ...................................................................................... 9 4
PC Installation............................................................................. 94
RAM Disk Installation................................................................. 95
PCMCIA Card Installation.......................................................... 95
Command Line Parameters......................................................... 96
Radio Types and Functions.......................................................... 99
RadioID Overview........................................................................... 100
Radio Ty pe.................................................................................... 100
Utility Features............................................................................ 100
Usage............................................................................................ 101
Help Screen.................................................................................. 101
Silent Mode ................................................................................... 102
Verbose Mode ............................................................................... 102
Radio Ty pe Identifying Messages ............................................... 103
DPOWCTRL.EXE............................................................................ 104
Packet Drivers................................................................................. 105
Introductionto Packet Drivers....................................................... 105
Definition...................................................................................... 105
802.11-Compliant (DS and FH) Packet Driver Configuration...... 105
List of packet drivers................................................................... 105
Initialization file .......................................................................... 106
How to Load an 802.11-Compliant
(DS and FH) Packet Driver................................................................ 106
Packet driver requirements......................................................... 106
Classification of Devices.............................................................. 107
802.11-Compliant (DS and FH) Configuration Structure............. 108
Example ........................................................................................ 108
Packet Driver Loading Options...................................................... 110
Packet Driver Options List.......................................................... 110
PTC-2124 DOS Software Guide vii
Startup R eason Codes..................................................................... 112
Code List....................................................................................... 1 12
ARLAN Diagnostic Reason Codes.................................................. 114
List of Codes................................................................................. 114
WAND TSR Installation................................................................. 115
Bar-Code System............................................................................. 1 15
Bar Code....................................................................................... 115
Plessey (WNDCD01.EXE) ........................................................... 116
Universal Product Code (WNDCD02.EXE)................................ 116
Codabar (WNDCD 03. EXE).......................................................... 116
Code 39 (WNDCD04.EXE)........................................................... 117
Interleaved 2 of 5 (WNDCD05.EXE)........................................... 117
Code 128 (WNDCD07.EXE)......................................................... 118
Ames Code (WNDCD10.EXE) ..................................................... 118
Code 93 (WNDCD09.EXE)........................................................... 119
Code 16k (WNDCD12.EXE) ........................................................ 120
SuperCode (WNDCD13.EXE)...................................................... 120
WANDDRVR.EXE........................................................................... 122
Loading Wand Drivers ................................................................. 1 22
WANDT130.EXE............................................................................. 123
Command Line............................................................................. 123
Command Line Option:................................................................ 123
WNDCDxx.EXE............................................................................... 124
PCMCIA............................................................................................. 125
The PCMCIA Card.......................................................................... 125
Formatting an SRAM Card ............................................................ 127
Formatting an ATA Card................................................................ 127
Installing a PCMCIA Modem ......................................................... 127
PCMCIA Card System Software .................................................... 128
CNFIGNAM.EXE......................................................................... 129
PCFORMAT.EXE......................................................................... 129
HDFMT.EXE ................................................................................ 1 31
PCM.EXE ..................................................................................... 133
Editable Fields ............................................................................. 135
Advanced Information ................................................................. 1 37
Configure...................................................................................... 138
viii PTC-2124 DOS Software Guide
Edit Config Parameters............................................................... 141
Information................................................................................... 143
Card List....................................................................................... 143
Client Information ....................................................................... 1 45
Option........................................................................................... 146
PCMATA.SYS............................................................................... 1 47
PCMCS95.EXE............................................................................. 150
PCMSCD.EXE.............................................................................. 154
PCMSSIT.EXE............................................................................. 156
PCMAPM ...................................................................................... 157
DPMS.EXE................................................................................... 158
PCM.INI........................................................................................... 159
AUTOEXEC.BAT............................................................................ 161
CONFIG.SYS................................................................................... 161
Miscellaneous Utilities .................................................................. 162
GETID.COM.................................................................................... 163
ROWMGR.COM Version 1.0........................................................... 165
Rowmgr.com Overview ................................................................ 165
Command Line Syntax................................................................ 166
Installation................................................................................... 166
DOS INTERLNK.EXE.................................................................... 167
Overview....................................................................................... 167
Requirements............................................................................... 167
Configuring the Client................................................................. 1 68
Starting the Server ...................................................................... 169
Establishing a Connection Between Client and Server............. 1 70
Breaking the Connection Between Client and Server............... 170
TXRX.EXE....................................................................................... 171
TXRX File Transfer Utility Overview......................................... 171
Using TX RX.EXE......................................................................... 171
DOS Return Codes....................................................................... 173
Execution — Menu Driven .......................................................... 174
Execution — Us ing Configuration File ....................................... 176
Cable Requirements..................................................................... 177
PTC-2124 DOS Software Guide ix
WHICH.BAT.................................................................................... 1 78
USERAPP.BAT ............................................................................... 179
Accessories....................................................................................... 180
References ........................................................................................ 181
x PTC-2124 DOS Software Guide
PTC-2124 Overview
The PTC-2124 is a rugged AMD™SC400
processor-powered, pen-based Portable
Teletransaction Computer (PTC). It couples standard
PC tec hnology with Symbol’s expertise in data
collection and radio technology to provide a flexible,
high-performance portable system.
This section of the manual provides a basic overview
of the PTC-2124’s software environment, including
brief discussions of
•thesystemBIOS,
• the operating system and applications,
• the software kernel,
• the PenRight! operating environment,
• power management, and
• software development kits (SDKs).
PTC-2124 DOS Software Guide 1
Chapter 3 Configuring TN-3270/5250
Functional Overview
The PTC-2124 uses a PC-type software architecture
consisting of three major software layers:
•BIOS(Basic Input/Output System)
•OperatingSystem
• Application
BIOS
Application
Operating Syst em
BIOS
Hardware
The BIOS is the lowest software layer and typically
exists i n ROM memory. It provides basic input/output
services for the system and an insulating interface
between the upper software layers and the hardware
layer.
The PTC-2124 uses a customized version of the
Phoenix™ BIOS to support PTC-2124 hardware
features. To achieve this level of support while
maintaining PC compatibility, a system extension
called the Sym bol BIOS, or TBIOS, is used.
TBIOS is a method for expanding the BIOS functions
without reserving a function number that could be
used by another application. This is accomplished by
forcing the TBIOS code to r eside with standard BIOS
code, but by providing a differententry point t o the
TBIOS. The entrypoint is defined by the contents of a
static lo cation in the BIOS Compatibility Area
(COMPAS).
2 PTC-2124 DOS Software Guide
Functional Overview
Operating System
The operating system provides additional h igher-level
services to the Application Layer and uses the BIOS
interface for performing hardware functions. By using
standardized BIOS interfaces , the PC architecture
supports standard operating systems. The PTC-2124
supports the MS-DOS 6.22 operating system.
Application
The application is the highest software layer and
provides controlling sof tware programs for the unit.
PTC-2124 DOS Software Guide 3
Chapter 3 Configuring TN-3270/5250
Other Software Components
Software Kernel
The softwarekernel is a simple program loader that is
used to reprogram the PTC-2124 Flash PROM
memory areas.
PenRight! Operating Environment
PenRight! is a graphical application development tool
used to create forms containing objects such as
buttons, l ist boxes, and writing fields for pen-based
computers. These objects are activated with a stylus
pen, which may be used to select options, highlight
items, enter strings of characters, or en ter a s ignature
on a digitized screen.
PenRight! applications are DOS progra ms that are
driven by events. Each depression or release of the
stylus on the digitized screen triggers a particular
type of programmed action.
Power Management
Power management is a necessity for ba ttery-operated
devices such as the PTC-2124. The unit is designed to
incorporate battery-saving p ower management
functionsdirectlyintothe unit hardware and s oftware
architecture. The platform hardware incorporates
features t hat allow most internal elements to be
slowed down or deactivated. Together, the hardware
and software constantly monitor system activity and
implementpower management activity states that are
used for power management functions.
4 PTC-2124 DOS Software Guide
Other Software Components
Software Development Kits
Symbol provides application development tools in the
form of Software Development Kits (SDKs) to help
developers design application programs for the SC4 00
product family. The SDK is a collection of run-time
libraries and TSRs that assist in the development of C
application programs on PC-compatible computers.
Once an application program is developed, it may be
copied to a PCMCIA card and in serted into th e
PTC-2124 to load or run the app lication.
Note: If converting applications from a PTC-1124,
any portion of the applicationsoftware that
directly manipulates the SLC (PTC-1124)
hardware will have to be rewritten before it
will work on the PTC-2124. The internal
architecture of the PTC-2124 is not
compatible with SLC. Any software (BIOS,
drivers, or applications) that manipulates
hardwaremust be written specificallyforthe
PTC-2124.
PTC-2124 DOS Software Guide 5
Chapter 3 Configuring TN-3270/5250
The PTC-2124 DOS unit is available in a wide variety
of configurations.
This section will cover the configuration options for
the following devices:
•Radio,
• RAM,
•ROM,
•Storage,
• PCMCIA Slots,
•Displays,
•IrDA,
PTC-2124 Unit Configurations
• Ethernet, and
•DCDDevices.
6 PTC-2124 DOS Software Guide
Radio Options
Radio Options
Batch
A batch unit does not have an antenna c able
integrated in the unit. It is still possible to install a
radio in the unit by way of the user accessible
PCMCIA slots. However, an antenna must be
installed on the radio. Either of the PCMCIA slots
may be used for a radio c ard.
LAN Radio Ready
The radio ready unit has an RSMA antenna cable
integratedintotheunit.Theendofthecableroutes
through the unit to the externally accessible PCMCIA
slot do or . A radio may be installed into PCMCIA Slot
0 (closest to the display) or in PCMCIA Slot 1 (slot
farthest from the unit’sdisplay).
WAN Radio Factory Installed
When ordered with a WAN radio such as a DataTac or
Mobitex network radio, the radio mo dule is installed
internally in the unit. Because these radio types are
not PCMCIA form factor, they require additional
spacein the unit. The unit thereforehas a deeper
backshell than non-WAN-radio-equipped units.
PTC-2124 DOS Software Guide 7
Chapter 3 Configuring TN-3270/5250
Memory
RAM
The PTC-2124 has RAM configurations of 4, 20, 36, or
64 MB on the CPU board. When the 16- and 32-MB
memory modules are added, the 4 MB is included. The
64-MBconfigurationactually contains68 MB of RAM,
but the SC400 is able to address only 64 MB and the
4 MB on the CPU board is disabled.
ROM
The PTC-2124 comes with 512 KB of ROM, which
contains the BIOS for DOS.
Storage Options
ATA
The PTC -2124 supports ATA drives, both solid state
and rotating. ATA Type II cards may be used in either
of the user accessible PCMCIA slots. Symbol offers
factory installed card options of 60, 110, and 175 MB.
The 520-MB rotating ATA disks (any Type III) are
installed in PCMCIA Slot 0.
SRAM
The PTC-2124 also supports SRAM (static RAM)
cards. Generally, these cards are used for special
purposes like reloadin g the ROM images (Genesis
procedure) or booting the unit, r ather t han data
storage because the capacities are rather low — 1, 2,
and 4 MB. However, these cards may also be used by
the application for data storage.
8 PTC-2124 DOS Software Guide
PCMCIA Slots
Compact Flash
The PTC-2124 has an internal Compact Flash ad ap ter
which is a standard 50-pin port that supports a
variety of Compact Flash module sizes.
PCMCIA Slots
The PTC-2124 has two PCMCIA slots that are user
accessible. These external slots are controlled by an
Intel PCMCIA controller.
External Slots
Slot 0
This is the card slot closest to the display.
Slot 1
This is the card slot farthest fro m the display.
Display
The PTC-2124 is designed with a 4.7” (11.9 cm)
diagonal ¼ VGA screen offering 12 lines x 40
characters of text in DOS mode. The standard
monochrome transflective LCD display offers 320 x
240 pixel resolution, 64 levels of gray, and an EL
backlight. A scratch- and impact-resistant touch
digitizer protects the display.
The PTC-2124 includes a transparent, resistive-touch
digitizer mounted above the LCD display. The
digitizer is designed to support both stylus and finger
activation and incorporates a minimal amount of
“palm rejec tion” to helpminimize hand contact. It also
uses transparent ma terial and will not interfere with
the LCD display.
PTC-2124 DOS Software Guide 9
Chapter 3 Configuring TN-3270/5250
IrDA
The PTC-2124 supports an IrDA 1.0 port loc ated on
the right side of the unit that pr ovides an optical
serial communication interface. The IrDA
communication port uses an infrared (IR) light beam
to support a half-duplex, point-to-point
communication link with a peripheral device.
Ethernet
The PTC-2124 supports Ethernet communications
using a full 16-bit controller to provide a high-speed
Ethernet interface via the cradle c ontacts for transmit
and receive operation at 10 Mbps.
DCD Devices
Auto ID devices are attached to the 30-pin
Scanner/Expansion moduleat the top of the unit.
Scanners
The PTC-2124 supports an optional laser scanner
module. Using an attached laser scanner, the unit
may be programmed to recognize, read, and
discriminate automatically a mong six 1D barcode
types. For instructions on using a laser scanner
module, refer to the PTC-2124 User’s Guide.
10 PTC-2124 DOS Software Guide
PTC-2124 Assignments
This section provides information on the following
PTC-2124 com p o ne nts:
• Resource Map,
• Hardware Interrupts, and
• COM Port Assignments.
PTC-2124 DOS Software Guide 11
Chapter 3 Configuring TN-3270/5250
Resource Map
PTC-2124 c omponents are assignedvarious address
ranges within s ystem memory.
Memory Allocation Table
PTC-2124 m emory is allocated as follows:
Address Size Resource Comments
000000-09FFFF
0A0000-0BFFFF
0C0000-0C7FFF
0C8000-0C9FFF
0CA000-0CBFFF
0CC000-0CCFFF
0CD000-0CDFFF
0CE000-0CEFFF
0CF000-0CFFFF
0D0000-0DFFFF
0E0000-0EFFFF
0F0000-0FFFFF
100000-xxxxxxxx
640 KB Base Base Memory
h
128 KB Video Video Display Frame Buffer
h
32 KB Video VGA BIOS ROM
h
8 KB ASIC SharedRAM area for ASIC
h
8KB -- Unused
h
8 KB PCMCIA/UMB PCMCIA Window or Upper
h
8 KB PCMCIA/UMB PCMCIA Window or Upper
h
8 KB PCMCIA/UMB PCMCIA Window or Upper
h
8 KB PCMCIA/UMB PCMCIA Window or Upper
h
64 KB UMB Upper Memor y Block
h
64 KB UMB Upper Memor y Block
h
64 KB BIOS System BIOS (shadowed)
h
>1 MB EMS Extended Memory
h
Memory Block
Memory Block
Memory Block
Memory Block
(reserved)
12 PTC-2124 DOS Software Guide
Hardware Interrupts
Hardware Interrupts
Knowledge of hardware inte rrupt ass ignments will be
useful for making system configuration decisions.
Interrupt Table
PTC-2124 hardware is assigned to the following
interrupts (IRQs):
H/W Interrupt PC/AT Usage PTC-2124 Usage Notes
IRQ 0 Timer 0 Timer 0
IRQ 1 Keyboard Keyboard
IRQ 2 IRQ(15:9) Cascade IRQ(15:9) Cascade
IRQ 3 COM 2 COM 2/4 COM 2 = User Port
COM 4 = WAN Radio
Serial Port
IRQ 4 COM 1 COM 1 IrDA Port I/F
IRQ 5 LPT 2
IRQ 6 Floppy Disk
IRQ 7 LPT 1 LPT 1
IRQ 8 RTC RTC Alarm
IRQ 9 PCMCIA Open for PCMCIA
IRQ 10 Ethernet
IRQ 11 PCMCIA Open for PCMCIA
IRQ 12 Mouse Digitizer
IRQ 13 Math Exception ASIC
IRQ14 HardDisk IDEATASSHardDisk
IRQ 15 PCMCIA Open for PCMCIA
PTC-2124 DOS Software Guide 13
devices
devices
devices
Chapter 3 Configuring TN-3270/5250
COM Port Assignments
ThefollowingarethedefaultCOMPortsettingsfor
the PTC-2124:
• COM1: IrDA,
• COM2: 15 pin serial or cradle serial ports,
• COM3:Scanner,and
• COM4: WAN radio.
14 PTC-2124 DOS Software Guide
Boot Options
The PTC-2124 uses a customized version of the
Phoenix BIO S (Basic Input/OutputSystem) that
supports PTC-2124 features. Because the BIOS
interfaces with the hardware, it must be aware of the
physical devices present in the system. This section
provides information on the following:
• The behavior of the BIOS at boot-up,
• Changing the BIOS settings,
• Changing the boot source,
• Drive letter mapping,
• Reflashing the BIOS, and
• Resetting/Re booting the PTC-2124.
PTC-2124 DOS Software Guide 15
Chapter 3 Configuring TN-3270/5250
POST
In PC-base d systems, afte r a boot, the BIOS is
responsible for testing and initializing all hardware
components and boot loading the operating system
into memory. This process is known as the Power-On
Self Test, or POST.
What Happens During POST
During the POST process, messages must be
generated for the system. The POST, initializations,
and messages are customized for the PTC-2124.
Once the POST operations are complete, the BIOS
loads the operating system. Once a bootable disk is
found, the boot loader is loaded into memory and
executed. If no bootable disk i s found, the system
displays the message: No Boot Device Available.
16 PTC-2124 DOS Software Guide
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