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Figure 1. NEC Ready 325, 425, 433, 466
Specifications
Processor
• Intel 386SX/25, 486SX/25, 486DX/33, 486DX2/66MHz
Memory
• 325: 2MB standard, expands to 20MB
• • 425, 433: 4MB standard, expands to 64MB
• 466: 8MB standard, expands to 64MB
I/O Expansion Slots
• Three 8/16 bit slots
Diskette Drive
• 325: 1.44MB, 3.5’‘ and 120MB hard drive
• 425, 433: 1.44MB 3.5’‘ and 170MB hard drive
• 466: 1.44MB 3.5’‘ and 240MB hard drive
Integrated Features
• Diskette drive and IDE interface controller
• PS/2 Enhanced keyboard
• SVGA controller
325: with 512 KB vRAM
425, 433, 466: with 1MB vRAM
• PS/2 Mouse
• One Parallel port and One RS-232C serial port
• 2400 Baud Modem
Internal Expansion Bays
• One user accessible 5.25’‘ bay
• One user accessible 3.5’‘ bay
• One internal 3.5’‘ bay.
I/O Architecture (Bus’s supported)
• Industry Standard Architecture (ISA)
Dimensions
• 4.2’‘ h X 15.4’‘w X 16.8’‘d
Power Supply
• 145 Watt
CMOS Access
• QAPlus/FE
Tools and Software Requirements
• 1/4’‘ Flat bladed and 2PT Phillips screwdrivers
• Diags and formatted blank diskette
• Anti-static wrist strap
NECNEC
Ready 325, 425, 433, 466Ready 325, 425, 433, 466
Jumper/Switch Settings
System Configuration, Switch SW1 for all units
Switch Setting Function
1 ON Turns off built in video
OFF * Turns on built in video
2 ON Turns off diskette controller
OFF * Turns on diskette controller
3 ON Turns off password feature
OFF * Turns on password feature
4 ON Disallows BIOS changes
OFF * Allows BIOS reprogramming
* Default
Network Flash Jumper, Ready 325 Only
Jumper Setting Function
J15 1-2 * Turns off network flash
2-3 Turns on network flash
* Default
Network Flash Jumper, Ready 425, 433 and 466 only
Jumper Setting Function
JP14 1-2 * Turns off network flash
2-3 Turns on network flash
* Default
CPU Select Jumpers, Ready 425, 433 and 466 only
Jumper Setting Function
JP1,JP2 1-2 * 486SX-QFP,486DX,487SX,Overdrive
2-3 486SX-PGA
2
JP12
JP15
* Default, JP12 is on the upgrade for 433 and 466 only.
When upgrading a 486SX, change the jumper before installing a
486DX or 486DX2
CPU Select Jumpers, Ready 425, 433 and 466 only
Jumper Setting Function
JP1,JP2 1-2 * 486SX-QFP,486DX,487SX,Overdrive
JP12
JP15 11-2 * 25/50MHz
* Default
Printer Port Interrupt Jumper, Ready 425, 433 and 466
only
Jumper Setting Function
JP13 1-2 * LPT1 IRQ7
* Default
1-2 486SX-QFP, 487SX Coprocessor
2-3 * 486SX-PGA, 486DX, Overdrive
2
1-2 25/50MHz
2-3 * 33/66MHz
2-3 486SX-PGA
1
1-2 * 486SX-QFP, 487SX Coprocessor
2-3 486SX-PGA, 486DX, Overdrive
2-3 33/66MHz
2-3 LPT1 IRQ5
IBM Document: NEC 02/97 Doc # MT0019
Page 1 of 2 Copyright International Business Machines, 1997
All rights reserved
Page 2
Jumper/Switch Settings (Continued)
System Board Connectors
Connector Description Ready
325
Battery J13 J8
Power Supply J10, J11 J7, J8
Hard Disk Drive J7 J2
Diskette Drive J8 J1
Speaker J12 JP11
Hard Disk Lamp J14 JP9
Keyboard/Mouse interface P5 P1
Ready
425,433,46
6
Removal Procedures
Before beginning removal complete the following steps:
1. Turn off the computer and any peripheral devices.
2. Disconnect AC power cord from outlet and system.
3. Disconnect all peripheral devices from the computer.
4. Discharge any static by touching static strap to chassis.
System Cover
1. Locate the cover release at the top of the system in
the back of the unit.
2. Turn the cover release with a coin or slotted
screwdriver so that the slot is in the vertical position.
3. Slide cover to the front of system a few inches.
4. Lift the cover up and off to remove.
Special Notices:
• All NEC hard drives are formatted at the factory and need
no formatting and are configured as primary by default.
• All switch settings will not be reflected until the system
has been completely repowered.
• IDE drive can not be used with the ST506 or ESDI type
controller boards. Remove the Non-IDE boards.
• When removing the processor chips, use a chip puller.
• Multi-Sync monitors contain high voltages, any internal
adjustments are to be made only by certified engineer.
• For Advanced Diags use a PC Diagnostic Utility.
• Troubleshoot according to errors found during test.
• Add memory to system, closest to the drive bays first.
• Different size SIMMS may be intermixed when adding
memory to system board, however, same speed SIMMs
are recommended.
• SIMMs memory chips have 72 pins
Field Replaceable Units
Memory OEM Part IBM Part
1MB @ 1MB x 9 SIMM 158-082066-080 61H5863
2MB @ 2MB x 9 SIMM 158-050294-002 61H6760
4MB @ 4MB x 9 SIMM 158-082182-000 48H7041
8MB @ 8MB x 9 SIMM 158-053380-000 61H6762
1MB @ 256KB x 36 SIMM2158-082315-080 61H5865
1MB @ 1MB x 9 SIMM
4MB @ 1MB x 36 SIMM
4MB @ 1MB x 36, SIMM 158-053409-003 48H7042
16MB @ 4MB X 36 SIMM 2158-053409-004 67H9767
16MB @ 4MB x 36 SIMM 2158-082316-080 61H5867
1
Ready 325, 2 Ready 424, 433, and 466
Internal Hard Drive OEM Part IBM Part
120MB, 3.5’‘, IDE HD 158-050395-304 20H9516
170MB, 3.5’‘, IDE HD 158-050395-308 20H9517
240MB, 3.5’‘, IDE HD 158-050395-305 20H9532
System Boards OEM Part IBM Part
G8KGR- 325 system
board
G8KGQ- 425 system
board
G8KHE- 433 system
board
G8KHG- 466 system
board
Diskette Drives OEM Part IBM Part
3.5’‘, 1.44MB Floppy 808-870954-101A 37H8753
5.25’‘, 1.2MB Floppy 134-505442-0060 22H1966
Cables OEM Part IBM Part
HD IDE signal cable 158-050324-002 55H1077
Floppy signal cable 158-050503-001 66H7465
Keyboard/mouse intf.
Cable
Miscellaneous OEM Part IBM Part
ISA backboard 158-126135-000A 61H6765
Power supply (145 Watt) 158-050490-000 22H1963
Battery 3.6v 158-060155-000 20H9490
Keyboard PS/2 style 808-897060-001A 49H5552
2
158-053409-002 61H6763
2
158-082311-080 61H5866
158-026129-001B 67H9667
158-026128-001A 48H6996
158-026128-100A 48H6997
158-026128-201A 61H5862
158-050366-001 61H6761
IBM Document: NEC 02/97 Doc # MT0019
Page 2 of 2 Copyright International Business Machines, 1997
All rights reserved
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