+.v
[
iiODsii@)
!~:t
.~
704LSJ.4
"
I.
I.
I.
74LS144
I
I
I.
MD,
IS
MD7
MD_
WAiT
iiffiT
",0
..
V
•
-=
•
24
26
14
IS
•
17-
16
D,
I
2
D7
•
iiiT
iEi£T
NMI
iiiQ
U23
ZIOI
MK3"4-6
PROCESSOR
\
-=
HAlT
iUiiK
iFiii
ii
iii
iii
iRED
iOiiQ
v
II
10
W-
.E
GNO
-=
II
23
2.
27
22
21
19
20
'iREQ
IAI5
BAI
IA13
..
u,,~
+llV
•
-5V
•
+SV
•
."11
-=
-=
ROn
p,
20
01
>------=~
.,.
74LS14
"
+.v
...
I.
~~---~~--_JL_-=:::::t1t::::::::::~L-~~
,r:-~
......
-...:.=<><lI3/-'''-< .....
-
--
--iii
- - - - -
.,
__
~L'
---
D(SCRIPTlDN
,----+~
+:v
"~I$
l:--f
2 ~ 2
e
7.
I ~ I
,.
----!
:-
r OfAIOGND
1011,
------.
~
......
~
---....r-
~
:=:::
12.
vee
I
U20
~
3 2732.
~
•
(27XX)
:"-?'
0-
6
--:;;
7
,#
••
PRG./Ci
All
19
~2
'21
1374L520
::r-'
tT---'~~~U~'30"!'4-",!1~3.f>i
12 V 1
7.lSI.
~~12!.t-!-1
+:v
12.
iEffi
74LS74
10
PR 9
~D
ar----~l1
lllljl
>U27 12
-I
Q~
-=
CLR
13
+sv
I 2 13 1 2
~, ~ ~.~:q:
~
:r.-::
:g/
!~ ! s~
,~
.~ • 7~
D7:!!;
.07
~02
~13
U2'
12
U9
~-+~""fv------~-.+'v
~
vee
· 2
0-
2
~
,.~.
I ~ •
.AIiI ~ A9
~
PRGtl/CE
*"
r OE"IO
_...!..-_
ItOM2
1097
14t>.IJJ~JPHANTO
~15
74LS10
R4
4.7K
1t3
4.7k
D'1!c(
2
2~2:X
I
fIT"
GND
••
112
7"
~-----
~
2~
!~
,~
.~
07
All
121
I
Rlr
II(,
f!V
67
3
:
7
iii-.......~·ROM.
IAI4-~
'AI3-~
IAI:I
J--""
..
Ull
-+",0-(:>'-+-""":'-1
IAIO
1~?:~:J--..:.::.t.
__
....:~f""1~=£:3
cr·~~+---~~-+~~~~~4
2 12
Qi
Q.!
r--
tt
7~3
l2.e
...
~.~
11
74LS...
10'
• 9 U9 3 ~ 3
1
12 13
:
5
:~
~
.!...
~IO
J
..
I7--+....;.I-
L 74S0'
2 7 I
74504
I
U9
9600
~:~~
1200"...,.
60
300,.
:~..
.......
6
BAUDS1RATE
r-::::
~
.ESET-,I'~3po.:.2-t
5 220
11:26
•
2~364"
~
"21
___
......
..,2,,2"r.
~+SV
,24,
-----1+5V
UI
22
+,y
-:!,- _ I
-=-
~
Girt"
r
lit
:C
I
----
~=F;~~t~~7~=;~iSE~L~E~CT
r ,
~
L...!..c
eK
~A
UI
Q~
~
CUt
Q 6
~
13
:-.0
UI
ac
,-E-
eLR
••
_
IJr-
~
CK
a
UI
:~t-~5
2 eL"
g,
t
~
""
OA6
lA,
•
3 6
:2
.1.
Z1
L~·lmi~·~·f·~ES!!I~ST~O!.~p.;e:.~'~:+~':v_..1
.~~.~
2
,
IIID~
::;
..".,..t+
-
INP 3
OUT~~j>~2~
..
2
1A3
...
_____ 1.-.-.:;
_
SER
IIIA"-.g
74LS14
po
74LSO'
15
741.$42
14
'3
12
~
--;.:.
..
u2
a~
ROM
11--
L-E.,
U4
AOIII
74LSJ2
+1:.
~
0"
,"1
'=!
D~
20
elK
TiC
22"'tm
II
_
cs
c/O
~
WRiffiGNDR:E::'rYr
____
________________________________________
0
.
2
3
TXD~~~"
:2
U6
RXD 3 11
AM95S
I 9 I w
m
s _
QSR
iTS
_
CTS
TX
ROV~
TUT
SYND£T~
.3=
I..
1"
=-
+
____
.-.-
3
•
10
1"'1"'1
,
15
MAl>
•
MAT
2
l
•
,
•
"---..!. 3
~
•
2
!
s
.
,.07
•••
• '--...!.!.
'0
11
12
.2.
••
'J:;:;-
MollS
.3
..
'--.l!.
•
+,v
•
••
si@..;
'''LSD''
+'V_-1
__
--,
I
L1..D
"3
4.7K
el
J
til--=-
7.lS7.
'4lSI.
7
'-
PRi'iET
7 5
I
2
.>-'",,12""1I0"°---1~_·--t3
"'
___________
+,v
+
X··
-,~:vtiUr:~
••
16 13
r<?15
24
10 UIS •
~.
~~
~3
13
U15
17
J 1 (s)
1419
r.::-
____________________________
+,v.---,
ZI ItS
I.
T1
r9
(.)
7
'23
13
A22
~1
(01-2')
(PINs)
EXT
_NIIONS
,UCTIONS
"
IK
APPliCATION
Asn
lOl£JtANCU
-
ANClU-
xu.-
1(X-
MOl ~ 07
••
IIIAI--.!.
PAR~
US£D
lfit
,;0,
II
rf{12
6'1-'--+-<.,":Y;~-J""01\,'''.7r.''''+'v
'n.L·'~'-I"""'VV"V-'
...
~O
-=
I.
•
"
•
••
2
••
• 3 7
17 3
..
•
.2
•••
7
..
LS2
....
.3
7
•
39
••
•
'2
•
,
15
2
••
•
••
3
3
•••
r-k-
as
021
> 3
Q
~
eLR
-b
I
+!y
,~r..~_'-~~~~~------~{)~--'
.~
I
2'¥. 2
l~
.~
s~
.~
,--2.
3
.
,
.
A'
AI
'255
r""
rIAl
U
r
r""
u
r
r"
lAIO
r
rIA"
lA12
r
r"
rIA,
riAl'
.7
".
..
2.7K
rt<
..
1~1~1
6
58
a
UII
rt:~ Q ~
.-:-:-:-:
-=+5\1
74unl
R"
4.11(,
~
+ r
t:;;l-S
14
e15
X
100
[2
•
U
..
'
•
A7
Al3
...
14LS'l'2
S •
6
U1I:>o','-1
+sv
iiffii
cs
..:3,'
"E'ET
S
RD
~3~==WRW'
l
__
~~~~F====18~~J
GHO
-:!,-7
OAT(
OWN
ON
INeHlS
ENG
....
SCAlE
DATE
DATE
SHEET
I
or
TllU
SCHEMATIC
CODE
1.0.
I
OWG
A
<1!1
tI
:::liI'
(!j]2
<JIl3
~
.
"G!J'
,-ru
•
~
~A7
Aa
::::E
~.
'0
~
.:E
"
::::m
'2
:::E
'3
<!!J
14
A15
-::::B:
1091
4~5
Jr',~·t>I""""
~
NO
3501000'
r"'r
99
;oc
lCI
O'
00
Sill
D
+:v
....
...,,~
yee
.,
~
.
.,
I~
'~D'
,:--g
I
l'4
•
~3
,'-f
•
':-+.
S
''fi
6
,~
D7
U23
llOI
.K3114-6
PROCESSOR
--.!.
+
~iiii
-2!.
iEffi
'7
-l--!!MiI
~iiiQ
~
BuiiiQ
I
GND
AIS
iiii.l1":::·---'1·,I<·"'p...:.:'-....:.:.toj:~--<41
RFiH
iii
WiI'·~1'-
is
~~I~·------·~~:.R£.
IoiiQ
I
•
?V
•
3,¥./ 3
4~
4
:~
:
7
:g..-
7
.
*'
I
.~
.
11O~
10
11
+-'
11
12~
"
13~
13
I
~
I.
2../
MAtS
1:~LSO:a
3/(.
V
2'
21
____
21
20
dF~>,>-,I,-------....,
I
~"'S;4LS109+S~
l.! J
PR
Q 6
,-4
...
U26
p---c
I
~ K Q~
I ±
(LR
- 1
+SV
Cl0
.,
330
ell
~L.J'HOI~~
~...--,'
Y I D
100
12
PF I MHZ
J
~2
C
13
K Q 9
+SV 15 13
.1
>.,
3,0
JI
_
:~
MHZ/
.,
...--
-
~
74LSIO •
~"'
+sy
,
~
-
3
U19 !
+~
o"!"
U30
11
,.
~
.,1
4.71\
..----!
+Sy
•
O..!..
0
U30
3
>
• ,'_
I~
• M
• N 4
sN.
.~
'~7
'~I
IIlA9 ~ "9
R!!
WR.....:.:.c
.~097;
14
1~3
U)
:I:
~ J ~RFSH
14
I
1~
~1~2~~ii
10
I 9
6
W--
~s
~2
~>-'~0-""sh6
PI
QI"'O"+--t,,-,,12'iD
U26
..........:....>
CUt CUt
I 3
~'.:>c":"""'-O-j>
74504
I
+IVm:>-J
"
IE>-
m>-
ffi>-+
GND
!E:"
[E>--<
1§9>-
16y
-
::TI::
I"~'_.,
~.,
yee •• "
I
...
i!!/
~
~
U2S
j I
flV
.".-.
.flV
--ioc
CE
6
WE
GND
D3
11
f!!-/
.D3 7 l.,.,.
~ ~
SOSI
SHlTA
9
~PHLD~
'iT
iD
10RO
+SY
10
PR~Cl
II
U46
Q~
+SY 13
TOLS74
(.)
__
r
~
~
'2
9
SY
+r
I7_
PI! 5 A
U.6
CLR
+sv
.--
U17
12
~I
U17)
f--
1
S
Y
'
,+3..
_
Q~+--Y-'l
Q
~
I
I
'1R"
T
(9 + 7IDS
~o
21f
___
-=-
e
.... _ .... _-+_
'905
c
i9f
L---+---"-,
,r;;;,o
7.1.'
I~
I • M
, 4 N 4
••
6~
'~I
IIlA9 ~ "9
RA~
Wi
__
r--2l
3
I
+2
0
F---f-t"-e-'-"t'"-------+Sy
F-t---<~---1~-------------<l+SY
~f--1-----
.F~-"t'"J..-e-s-----
f-t--'r------+
H:=====:"'L-~:""-I'CLK
.574
'
.,
+Sy
Til
~.,
yee
I
~
U24 j I
.".-,
N s ,fE/ 6
6
7
~
CE
~
WE
GND
+sy
10
.:.:12'-jD
PR
Q!-'9,-..".6j4
>UIO
13
eL'-i"
+Sy
'097
.........
rIO~~-=~.,..:.._-<l.
I'
~
~PCLK
~.~.
-,
74104
13f.:':t...
1'2
V
PUK
"",VV'\r4>--+-i
12
1-+
e6
1.
,
f
...
_._'_..J
T
.~
...
~-
l'f
~
S •
.~
D3
6~
.!!/
.D'
7
'~I
1Il..,9 ~ A9
~
~
Roh
1097
""b~'--<!'.
~
-
"
(30
33
PF
11:25
t-t--'V'VIr-<P"-'V\""'.
R27
~
~f>';':---"""Vv\"'.
(20,21,22,23.24,
.1
e12.
1
·
~
1.2
74S04
'S,,..27,.....
13.16.
17,
11,19
-
Sy
~g
-12Y
12Y
+!y
~.,
~
:"4 • ('7XX)
'::+.
r
220
I"
yee
•
I
U.O
~
213
..
s
6
'
PRGIIl/CE
0(1010G"D
All
19~2
11
ill
""14-
r:o
IAIJ-r:o
BAll
-f~30-<Y:-f-~"
1126
22
+.y
2~13644
"21
22
-::!=-
~
.."
~
~
~I'
•
~
•
3~
3.:"4.
.~
• s ~ s
.~
S16~
6~16'N:'
~7
~
1107
IIlA9,,#
? r
7
..
LS14
13
g::
'.LS393
13
1
r---:~"
L.::o
•
DI· ~ 11
UI
til
U:
Q.
'---
I .
r----
L...!c
Ck Q 3
01"
Ul
ac
r-L
CUI
Q 6 I
'---
I
~
~~:O:-'
UI
QC~
,-E-eUlQ'.!...
-
~r-3
:.:~
~
eUOD..!...-
1'--
,.uo
..
12
IAT
•••
us
,
+:v
I ••
~.,
yee
!
~
; u21
~
3
27XX
6
.~
•
"9
rl
PRc.1ff
DE
AIO
GND
,,.
112
-=
iiEffi
10
PR
Q~~l
>U27
ii~
CUt
13
+sv I
7'LSIO
10
9 8
9 u
12 13
7 SELECT
74$04
'2
All
9600
"100
2400
1200
_~_
ROIllI
14LS14
12
l
-=
C 9
5
r1lo
1
11
J
-t-.J
~O
t-~s
U9
6
74S04
,,'
21
'.LSD'
12
13
~-+~'VIty---~
U9
u2I
lr"'l
13
12
74LSID
"4
R34.71(
.097
~--
14~131
.......
L.:JIS
4.7K
C,.,.IPM(i;i
~F-'
__
Rll
1M,
+SY
,,!L
+Sy
flO
.,
t'¥.
D'
,~,
.N
,
-'-."'0
0
'2
3
3
..
07
eLK
13
_____
U6
..
""
g
__
-
3
I.~
I
IAUi1RATE
r::::::::
......
......
~~
150
::.
110
,.
'---
••
S.T~I~~3~~1-i----~--
INP 3
OUT-L~P.""'-<I>-
...
IAl
""
•
"l-:-
:~ ! Dsi~
MD7'-!
'--
__
7"LSI"
r:::...
..
l7
74LSO"
IS
U.
74U42
14
13
0
"
10
_1':
TXD
...
_,
OTlt
ru
'21
~_
_
11
'
1
Vector
Section
ZCB
Single
Board CCJtplter
Table
Specifications
I.
Perspective
1.1
1.2
1.
1.4
1.5
II.
User's
2.1
2.2
of
Contents
The
ZCB
The
ZCB
3
c::l'{J
sectiOll
~
I/O
sectial
1.5
.•
1
1.5.2
1.5.3
1.5.4
1.5.5
1.5.6
Guide
Introduction
2.1.1
Cl?U
Sec-tial
2.2.1
2.2.2
2.2.3
as
a system
as
part
••••••••••••••••••••••••••••••
of
a system
••••••••••••••••••••••••••••••••
••...••••.••••.................•.............•..
section
••••••••••••• ~ •• o
Serial
Serial
Serial
RS-232C
RS-232C
Paral.lel l?C)'rts
.•...•..•••••.••......••.•................
•••••••••••••••••••••••••••••••
Ports
Generally
••••••••••••••••••••••
Asynchronous Communications
Synchronous Communications
Theory
on the
•••••••••••••••••••••••••••••••••••••••
ZCB
••••••••••••••••••••.••••••••••
•••••••••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••••••••••••••••
Standard
Running
~
Auto
Jumpering
•.••••••.••••••...••••
the
system
erlable/
WAIT
disable
state
erlab1e/disab1e
and
at 2 or 4 MHz
•. '
what
.......
•••••••••••••••••••
••••••••••••••••••••
it
does
•••••••••••••••••
0
•••••••••••••••••••••••••
••••••••••••••••••••
It
•••••••••••
••••••••••••••••••••••
~
•••••••••
e
••••••••
e
•••
III
.....
l-l
1-1
1-1
1-2
1-2
1-2
1-3
1-3
1-4
e
•••
1-5
1-6
2-1
2-1
2-1
2-1
•
2-
2
2-2
Rev.
2.
2.4
1-8
3
~
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
I/O
2.4.1
2.4.2
2.4.3
2.4.4
6/1l/80
SectiCll"l
2708
AuXiliary
2716
2732
••••••••••••••••••••
EPRCMAddressing
Memory
EPROM
EPROM
Addressing
Addressing
Enable on-board
Phantan enab1e/disab1e
Jumper
Sectial
I/O
areas
K,
••••••••••••••••••••••••••••••••••••••••••••••••
Pc>rt
Mdressing
Address Mirroring
Asynchronous
HOw
to
connect
Serial
most
'
••••••••••••••••••••••
•••••••••••••••••••••••••••••••
Disab1e
••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••
EPROM
on
boot
•••••••••••••••••••••••
••••••••••••••••••••••••••••••
Land M
•••••••••••••••••••••••••••••
••.•••••••••••••••••••.••••••••••
disab1e/enab1e
Baud
Rate
serial
••••••••••••••••••••
Se1ection
terminals
and
•••••••••••••
printers
•••
2-2
2-3
2-4
2-5
2-6
2-6
2-7
2-7
2-7
2-7
2-9
2-11
2-11
Vector
ZCB
Single
Board Ccltplter
Section
2.
III.
'lheory
3.1
3.2
N.
Schematics
2.4.5
2.-4.6
2.4.7
2.4.S
2.4.9
9 Spare
of
System
Serial
How
to
connect.
JOOSt
COnnecting-additional
USing
the
COnnecting
Parallel
Sprint
Connecting Vector
Clip-
and
Patch
areas
Operation·
operation
Ports
Block Diagram
•••••••••••••••••••••••••••••••••••••••••••••••
low speed
RS-232C
Ports
3
to
ZCB
MP
to
accustic
handshaking
cooplers
lines
••••••••••••••••••••••••••••
••••••••••••••••••••••••••
ZCB
•••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••
~
•••••
•••••
2-15
2-l5
2-lS
2-l9
2-19
2-20
3-l
3-2
Rev.
l-B
6/ll/S0
Static
RAM
Fully
canpatible
vector
ZCB
Single
Board
catpJter
•
MWRITE
wai t state
for
memories
than
300
Bus
!Dad
Bufferin;
Phantan:
Mirrorin;
.
capacity
Serial
Port
generation
ns.
port
addresses
slower
Jumper
Standard:
3
cycle,
instruction,
Standard:
instruction.
1
Fan
OUtput
~
Power-on-clear
Standard:
Standard:
1
as
1,
Any
addresses
Control,
option
option
options:
stamard
out:
serial
input
using
increnent
generate
generate
generate
T1'L
15
standard
buffer
Boards,
enabled
enabled,
SPECIFlCATICt&-I/O .
RS-232
or
output.
8251
are:
05H
to
generate
enabled.
one
generate
one
load
disable
which
(PCX:).
can be
and
controller
of
four
Data,
(echoed
MWRITE
one
wait
state
wait
wait
state
all
inputs
generate
Jumper
disabled.
chip.
OOH
(echoed
07H.)
state
states.
selectable:
wait
no
.on
(60 low power
canpatible
3
8-bitparallel
fran
04H
on
on
after
after
with
phantan
to
FFH.
on
board
on
each
each
each
shottky)
Vector
in
ports
Preset
06H)
1
bus
Ml
Ml
Graphic
response
on/off.
programnablt:.
to
,,.--.;)
Signal
RS-232
Asynchronous
levels
handshakin;
Rates
Data
Step
parity
bits
bits
EIA RS-232C
Typical
DSR,
Uo-9600
5 -
handshakin;
etc.
baw
8,
programnable
1, 1 1/2,
Even,
ood,
is
(switch
or
2,
or
oone, programmable
selectable)
programnable
provided,
ie.
RI'S, ers, OrR,
Rev.
l-B
6/11/80
vector
1.1
'!be
The
canplete
normally
rontained
'!be
sockets
ports.
5-100
based
regulators
1 low power 'r!'L
ZCB
ZCB
as
Vector
ZCB
for
8080
systems.
Single
a
Board
system
Graphic
canputer
find
on
on a CPU
one
5-100
system
contains a Z-aOA
up
to
Circuitry
signals
and
12K
are
~
heat
load
is
sinks
while -ootput
c.atplter
I.
PERSP&:TIVE
ZCB
Single
Board
on a single
board, a PROM/RAM
bus
canpatible
miCtopLocessor,
of
PRQ1,
one
provided
also
generated
power
serial
to
regulation
_for power
fanoiit
canputer
toard.
board.
'!be
1024
I/O
support
static
making
and
dissipation.
is
10 'tTL
provides
ZCB
board
-
bytes
port
or
the
ZCB
filtering
Input
loads.
rontains
and
of
and
three
dynamic
compatible
is
loading
the
capability
what
an
I/O
static
8-bit
merrcries.
provided
.
board,
RAM
on
you
rnerII)ty,
parallel
with
using
the
bus
of
a
~uld
all
All
8080
IC
is
complete
sort
ZCB
control
worth)
Sense
section
could
data
data
an
and
data
1.2
'!be
Vector
.
significant
the
Demands
the
board
1.3
CPU
mictq?rocessor.
lines
'r!'L
While
the
stand
is
needed
could,
applications.
could
data
of
be
ccmmunicated
input
processing
intellegent
provide
proceSSill3
ZCB
as
In
most
Graphic
overall
on
canplete
The
ZCB
and
SerialjParallel
section
The
Vector
are
load.
ZCB
does
alone
as
~ll
however,
be
the
used
arrive
board
a
SlIt'I'IBry
ccW.d
and
location
node
ootput
bmmediately and
system.
part
of a system
applications,
microcuuputer
cast
savings
ccmputer
the
};:OWer
system.
carbines
Graphic
'!be
fully
In
buffered.
addition,
replace 3 boards
microcallputer
as
additional
be
used
In
on a ZCS
by
and
to
on
a
as a complete
this
case,
an
input
any
the
equipnent
of
actions
by
the
~lete
board.
data
serial
h9Wever,
system.
are
it
IOOSt
I/O
the
realized.
is
are
used
board.
ZCB
is
5-100
tDading
board
used
also
is
that
supply
the
board
in a typical
on
one
board.
RAM
mem:n:y,
preprogrammed
that
was
parallel
output
via
taken
the
rould
PJrt.
process
control
provide
the
ZCB
will
Since 3 boards
It
_also
with
by
reduced,
features
designed
bus
ccmpatible.
on
the
has
the
necessaty
A
for
rrost
microcollplter
PROMs
Eqripped
p:Jrt, be
(ca1trol
outp~t
be
cx:mnunicated
Thus
the
system,
information
be
used a
reduces
freeing
thereby
of
3 boards.:
around
bus
is
no
circuitry
system,
tenninal
applications.
(up
with
processed
signals,
parallel
ZCB
might
which
to a higher
~rt
are
replaced
the
physical
up
two
lightening
CPU
the
powerful
All
input
nore
than
it
is
device
in
a power
many
to
by
for
of
process
12K
supply.
the
instance)
port.
to
a
central
be
used
rould
decide
of a canplete
by
size
5-100
board,
slots.
the
load
PRaVRAM
Z-80A
and
output
one
standard
to
work
not
sane
The
bytes
CPU
The
level
one,
with
a
as
of
on
Rev. I-a
6/11/80
1-1
dynamic
des
i9n
MSI
1.4
P10VIWI
The
and
in
this
Their
ZCB.
This
systems,
p::lWer-on/reset
wide
1.5
I/O
The
parallel
level
printers,
The
The
uses e igh t I/O
addresses
of
256
logic
merories,
has
and LSI
section
PROM/RAM
up
to
manual,
technical
The
allows
ran9E!
sectioo
I/O
ports
serial
CPU
I/O
addresses
possible
built
such
been s·tressed
integrated
section
12K
of
PRCM,
the
distinction
PROM
may
the
user
languages,
are
available.
of
addressing
section
or
ports
port
nodems
sends
and
data
used
addresses
by
jumper(s),
port
into
the
as
Vector
to
circuits.
features
RCM
or
terms
be
implemented
maximum
etc.
cptions.
of
the
programmable
for
interfacing
terminals.
to
by
the
as
listed
addresses
Vector
Graphic's
enhance
EPRQt.
PROM,
makes
flexibility
Several
h3vanced
ZCB
single
the
serial
board
from
OOH
may
Graphic
reliability
lK
of
Note: For
El'R<l" and
no
difference
using
address
board
as
with
and
can
be
to
FFH.
in
Section
be
accessed
ZCB.
Vector
64K
rnenory
on-board
RCM
either
with
regard
jumper
input
multiple
parallel
changed
2.4.1.
ZCB
board.
of
operation
RAM
the
purposes
may
be
in
how
2708's,
to
options
decoding
computer
or
output
perpheral
ports
as a group.
You
specify
Thus,
with
Single
meI'OC)ry
used
interchangably.
they
are
2716's
choice
such
logic
offers
and
devices
via
the
the
the
advanced
Board
Catplter
Simplicity
by
the
use
(using
of
of
2114's)
discussion
used
in
or
2732's.
operating
as
jump
permits
three
one
RS-232C
such
I/O
addresses.
The
value
of
entire
decoding
of
of
the
on
8-bit
as
board
the
range
a
~.'\
I
/
-~.\
)
The
though
its
the
1.5.1
.
tJSARI'
Serial
of
chip
via
transmission,
as
added-on
choice
using
communication.
is
asynchroncus
cases,
1-2
ZCB
Board does
Vector
features.
board
as
ports
The
it
generally
Discussion
(Universal
the
flexibility
and
its
parallel
software.
ASCII
and
code·
parity. bi t (choice
of
one,
the
8251,
hardware
not
cane
with
arry
Graphic
Vector
canes
of
the
supplies
Graphic
fran
serial
the
certain
ExteOOed
factory
port
centers
Synchronous/Asynchrooous
of
the
ZCB
board
counterpart,
You,
the
fotmat
having
one
and a half,
the
board
Baud
or
synchronous,
through
of
between
of
can
rates,
the
software,
the
5
and
even
or
handle
format,
is
specified
transmitted
or
nodifications.
software
items
Systems
without
around
for
of
software
~nitor
arry
tredification.
the
Receiver/l'ransmitter)
derives
8255,
8
bits
odd),
two
stop
either
handshaking,
fran
both
control
data.
per
and
of
character,
wi
can
bits
asynchronous
and whether
tbroogh
specific
industry
the
flexibility
which
the
Data
th
one
per
character.
software
applications,
that
4.0
will
standard
chip.
can
be
rate
is
transmitted
with
start
or
synchronous
cannunication
and,
Rev.
I-B
make
use
work
of
modified
of
serial
an
optional
bi t and
~r,
in
6/11/80
of
with
8251
Much
this
a
some
Vector
the
order
port,
to
ZCB
It
is
8251
to
yoo
Intel's
Single
not
within
USART
write
your
will
need
Application
Board
chip,
own
the
to
nor
be
Synchronous/Asynchronous
This
Note
is
also
an
More
readily
sc::/
about
User's
am
Manual,"
Mam
Products,"
available
a:mnunication
Osborne's
also
excellent
available
"An
available
Introduction
catpJter
scope
of
this
to
teach
communications
thoroughly
Note
#16,
manual
the
software
familiar
entitled
ReceiverjTransmitter,"
reference
references
theory,
either
in
many
are
the
fran
to
canputer
on
the
"INrEL
Intel
Microcanputers,
to
theory
on
basic
8251,
or
stores.
detail
of
serial
or
to
with
mOdify
this
"Using
which
communications
but
8080
ones
Microcomputer
most
canputer
the
functioning
ccmnunication.
the
chip.
The
8251
Intel
You
will
that
retail
volume
II
ZCB
serial
can
refer
Universal
provide.
theory.
have
less
Systems
stores,
- Sane Real
of
In
to
1.5.2
serial
You
110, 150,
rate
If
the
without
modem
bits/second,
keyboard
IlDdem
You
character,
of
step
you
and
in
software,
1.5.3
serial
You
Modifications
the
outside
board.
Olce
carmunicaticn,
with
length,
software
chasen,
select
synchronization,
asynchronous
can
select
300,
usin;J a
you
chosen
small
are
rate
physically
that
is
you can
to
change
at
ar'¥
given
can
select
selecting
bits
can
if
in
select
chosen,
see
synchrooous
can
enable
8251
SYNDEr
~rld,
set
up
asynchronous
selecting
whether
whether
separately
cc:mm.micatial
the
rate
600,
1200,
DIP-swi
writ~
of
custan
a
port
opening
switch
write
the
canputerl s
time.
via
software
either
each
character,
whether
whether
the
or
or
references
<XJmI.lnication
the
to
pin
which
for
by
the
usinq
serial
board
and
the
is
not
sync:hrornJS
an
camumication,
either
or
not
not
for
a
it
each
or
and whether one
of
transmission
2400,
4800,
tch
on
the
software,
by
4,
up
the
selectable
a program
5,
6,
selecting
not a parity
not
it
is
given
port
will
be
TxC
and
the
case
communication,
external
you can
5,
6,
parity
is
even
port
bit
whether you
or
or
bocm:1.
there
allowing
computer.
for
that
rate
of
the
number
7,
or
even
earlier
to
carmunicate
required
RxC
in
the
clock
7,
or 8 bits.
is
odd
~
included
synch
or
and
reception
9600
bi
ts/second • You
is
also a simple
sate
software
For
either
1200
enables
catmunication
of
8.
either
bit
or
clock
data
You
can
1,
is
included
odd
parity.
for
the
to
acccmplish
pins
standard
you
between 0 and
select
via
You
for
parity.
are
Also
using
characters
fran a choice
control
example,
bits/second
the
operator
to
match
bits
also
1-1/2,
in
select
or
for
For
8251 USARl'.
in
the
synchronous ItDde.
this.
must be
connected
configuration
can
select
56K
bits/seconj.
software
can
each
also
character,
via
software,
internal
are
way
if
each
2.
each
how
the
the
or
used.
choose
to
divide
of
the
you
have
or
using
that
of
ASCII
the
nuni::ler
Finally,
character,
to
do
this
In
brief,
to
of
rate
character
select
and
yoo can
external
of
the
rate
a
300
the
the
the
the
of
As
via
if
Rev.
1-8
6/11/80
1-3
1.5.4
RS-232C
This
theory
manual
description,
by
Electonic
Street,
Da
tapro
N.W.,
or
articles
infocnatioo,
cannot
obtain
Industries
washin;ton,
Auerbach
describing
however,
a
will
cc:py
reports
the
describe
of
the
Association,
D.C. 20006.
protocol
be
of
the
RS-232C
RS-232C
EIA
Engineering
Alternately,
on
cormnunications,
and
irrmediate
its
relevance
Vector
protocol
ZCB
S'I'ANIl\RD
Single
in
detail.
document,
Department,
if
you
they
~lications.
in
contain
this
Board
For
published
have
access
The
following
manual:
Ccl1plter
a
full
2001 Eye
to
thorough
An RS-232C
Positive
industry
RS-232C
to
and
fran
(about 0 Wc)
An RS-232C
data
line
cot'resp)nd
also
associated
by
the
and
are
ccmnunication
receive
handshakin;
equipment
and a few
specifies
definitions
signals.
applications
In
fact,
the
very
above.
handshaking
protocol.
requires
.
expects
It
to
is
directional,
travels
on
protocol
device
short,
Tetminal
given
which
of
and
line
kind
signal
is
ON
wide cc:nventions
line
drivers
'rl'L
and
cable
carries
with
can
or
SPACING,
signals.
RS-232C
consists
a
the
characters
typically
serial
foonating
device
data
lines,
to
others
a
set
as
lines
inform
sane
that
of
of
that
each
are
rarely
the
Altogether
use oo1y a few
real
world,
few
devices
Many
require
lines
In
short,
"full
RS-232C." You IIIlSt
receive
important
that
each
line,
specifies
the
type
at
the
Equipnent,
can
be
of
device
vety
even
differently
it
on
each
to
is,
relative
that
called
other
or
"m'E"
determined
•
either
be
Negative
that
date
invert
Hence,
NB:;M'IVE
of
25
sequence
you want
and
parity
such as
there
are
are
used
other
rarely
used
primary
there
of
few
are
then.
devices
require
one
or
is
oonfusing
line.
understand
the
protocol
to
at
one
"Data
end
there
for
once
POSITIVE
back
is
to
these
(+12
OFF
the
signals
Wc)
or
RS-232C POSITIVE
corresponds
lines.
of
to
information
an
8251.
ground
by
ccmmunication,
of
their
used).
"secondary"
lines,
25
require
all
of
even
than
none.
defined
at
this
specify
that
RS-232C
to
An
RS-232C
PCSITIVE and
transmit
attached
In
lines,
status
The
full
lines
but
carry
"full
the
handshaking
Further,
by
tine
exactly
most
of
specifies
the
ends
of
the
end
of
an
RS-232C
Conununications
must
short.
you
be a device
The
direction
decide
which end
or
of
wilen
NmATIVE
key
telegraphy.)
they
are
MARKn«;. (These
days
corresponds
'l'1'L
high
(about 5 Wc).
transmit
NEGM'IVE
or
receive.
to
addition
(lines
the
to
the
1
and
7),
tetminal,
(lines
lines
4,
RS-232C
which
an
independent
defined,
RS-232C"
5,
6,
protocol
have
protocol.
lines
many
RS-232C,
to
say
that a given
what
signals
the
RS-232C
which
direction
cable.
cable
Equipment",
of
of
devices
violating
Therefore,
there
or
the
the
of
your
(-12
Vdc).
te1:l1lS
converted
to
TTL
or
receive
pulses
that
There
information
transmit
and
caaputer
8,
20,
there
and
also
the
same
set
but
most
mentioned
device
it
sends
lines
the
signal
must be a
"DeE"
type
signal
"Data
on
cable
are
low
is
22,
of
use
the
and
are
the
for
has
In
a
.. '
",
. '!be
1-4
terms
Data Ccrmunication
E):;Iuipment
and
Data
Terminal
Equipment
Rev. I-a
derive
6/11/80
vector
from
ZCB
Single
the
original.purpose
communication
involved
when
equiptent,
either
one
look
then
on
connection
FOrt
connected
as
or
the
like
the
RS-232C
the
same
so
that
at
when
OCE
other
OCE,
can
Board
CaIplter
for
RS-232C
device
all.
to
such
Since
a modem,
as
a modem. A
a cx:mputer
or
it
can
can
either
play
connect--eato a tetminal, a canputer
or
at
and
cannectioo
lines
be
it
receives
lJ1'E.
made,
However, a
aIrf
one
you
and
receiving
in
want
this
and
tUne.
to
will
not
case,
transmits
given
If
serial
the
connect
~rk.Both
on
the
you
on
-'to
connect a terminal
computer
play
the
the
part
serial
FOrt
port
it
to
same
must
the
rewire
lines
can
happens
another
ends would
lines.
specified
does
part
of
only
to
OCE
Before
the
CCJrq?uter' s
with
not
have
of a terminal,
communication
FOrt
can
be
be
wired
be
wired
such
as
a rrodem,
be
transmitting
the
RS-232C
serial
for
lJ1'E.
to
used
up
up
a
be
as
to
1.5.5
RS-232C
the
serial
end
of
end,
havin;
the
computer.
board
Data
of
are
catmunications
the
Drivers
and
Receive
r,
eceivers
jl.JIlt)erirq.
to
RS-232C
In
addition,
appropriate
table
the
are
fran
"1!ddi
pin
available
the
install
.
control
FUrther,
the
standard
output
board,
and
of
nor
Connections
these
on
the
FOrt
this
line
an
RS-232C
directed
cx:mputer
are
provided
oata
and
drivers
When a serial
lines
pins
tional
assignments.
on
8251 which
jumpers
any
two
a
l'IJlri:)er
serial
lines,
lines.
are
but
drivers
ZCB
to
ccrrmunicate
to
the
The
cable
to
the
Equitxnent.
is a OCE
lines
3 and 2
four
of
on
the
RS-232C
the
cable's
can
and
RS-232C
of
them
of
I/O
they
on
ZCB
over
serial
standard
is
designed
RS-232C
RS-232C
for
the
to
input
are
already
I/O
cable
respectively.
the
RS-232C
8251.
handshakirq
When a
DB-25.
be
accessed:
line
via
software.
other
cable
are
and
RS-232C
mentioned
not
receivers
Board"
an
port
socket
08-25
femal~
lines
'lbus,
the
pjrt.
serial
or
output
connected
is
control
These
lines
serial
'lbere
TxRDY,
drivers
lines
camected
connected
in
Section
RS-232C
on
connector,
so
that
at
the
resulting
port
to
at
RS-232C
installed
are
Dl'R, I:SR,
available-
I/O
cable
are
TxMr,
to
enable
are
above.
to
anything
2.4.6
line,
the
you
ZCB
appropriate
DB-25
connector
Il3-25
enable
the
voltage
on
the
these
lines
four
is
installed,
other
are
SYNDEr
the
available
These
other
to
them. The
lists
will
boaJ:d,
to
the
socket
8251
board,
signals
connected
RI'S
and
in
Section
signals
and
8251.
on
are
than
the
functions
connect
and
back
signals
as
at
Transmit
levels.
requiring
are
Cl.'S.
these
RxRDY.
to
dynamically
the
board
both
pads
table
TO
enable
one
the
other
panel
if
fran
it
the
of
the
were
rear
Data
These
no
connected
to
the
See
the
2.4. 2 for
signals
available
You
can
using
input
on
and
the
"RS-232C
of
each
Any RS-232C
for
each
t=Ort,
handshaking
output
transmi
Rev.
of
tter
1-8
the
line,
any
two
can
6/11/80
line
._
can
8251
can
and
the
RS-232C
be
disabled
---
..
be
connected
be
used
8251
handshaking
. _ -
----
can
or
to
to
ll'Cnitor
be
enabled
-
+12 vrx;
used
lines,
by
on
in
software
to
and
anyone
the
control
lastly,
board.
anyone
fran
RS-232C
In
addition,
RS-232C
software
the
8251'5
incoming
the
1-5
harrlshakin:]
driver
output
For
be
required
ZCB
beam.
input/output
tenninals,
,
To
Ccrrmunications Ek;IUipment, a
port.
attaching
sane
thing.
lines
necessary
Of
connected
addresses
fran
Vector
devices
For
example,
having
into
the
contains
service
has
to
MOOS
and
System,
line.
available
handshaking
the
large
'!bus
can
connect
'lbis,can
a
already
as
course,
to
and
Graphic
whidl
option C enables a standard
seriaL
a
progran
via
a lrodeIn
be
converted
CP/M
output
'!bere
qn
the
line.
majority
other
Null
However,
than
the
ports
serial
without
be connected
to a modem,
either
Modem
connected,
explained
software
the
serial
instructs
describe
eadl
Vector
at
the
The
that
connected
to
to
Vector
printers
from
is
00ard
those
be d.one
cable
if
l&-232C
in
is
port.
you how
t.ime
Version 4 Extended
enables
a
one
spare
whidl
of
applications,
already
ports
modification.
with
acoustic
serial
by
to
then
additional
'Section
necessary
to
'
the
Graphic
of
this
.
via
r:7rE
port
Graphic,
via
the
RS-232C
can
be
connected
can
very
little
handshaking
Section
particular
the
or
coupler~-Or
port
lIllSt be
dlanging
the
external
2.4.$.
in
dlange
soft\ere
writing,
serial
cperator
IIDdifications
2.4
them
an RS-232C
first.
and
Vector
serial
port.
vector
used
no
no
the
order
product
terminal
Systems
cable
Lastly,
Z,CB
receiver
to
connect
additionalRs-232C
to
Most
cooverted
boan:3
oa-25,
is
required,
'
to
gives
as
necessary.
addresses
active
be
serial
other
wiring
which
operate
the
often
difficulty._
I/O
controls.
any
Extended
to
to
Graphic's
Moni~or
ccmnunicate
to
the
operating
Single
aro
one
one
catqX)nents
used
into
to
the
standard
Systems
be
serial
Word
Board
Carplter
spare
RS-232C J
input
and
lines
as
DeE RS-232C
printers,
kind
slightly
accanplishes
other
specific
Other
and
plugged
to a time
systems
of
a
orE
RS-232C
than
board
will
devices
I/O
documents
peripheral
Monitor
directly
(any
option)
port
such
Managagment
one
will
on
the
and
Data
or
the
the
port
share
which
by
be
as
-
-"'
",
1.5.6
Parallel
Parallel
34-pin
'supplies
connector.
to
below.
output
possible
Microcomputer
Additional
Table
1-6
Ports
The
ZCB
Ports
connector
an
configure
Each
parallel
or,
in
12
in
Input
and
has
A, 8
optional
The
it
in
l-tJde
pins
Section
output
three
aro
whidl
other
as
desired.
port
the
case
0,
nore
Systems
provide
2.8.
is
independent
C.
'!hey
is
l10Jnted
34-line
end
of
this
Many
has
eigh
of
Port
are
available
User's
+5
VOC
accomplished
are
ribbon
cable
of
't
pins
C,
Manual
and
GND.
parallel
connected
on
the
cable
has
the
34
which
control.
in
~es
for
nore
Exact
using
input
to 'the
.tcp
of
that
no
connector
lines
can
16
information
pin
IN(put)
or
output
outside
the
cam.
connects
are
not
be
p~ogrammed
different
1
and
2.
assignments
and
ports,
'NOrld
vector
to
on
it,
allowing
used,
as
canbinations
See
Intel's
on
~es
are
OUT(put)
Rev.
1-8
called
via
Graphic
this
discussed
for
input,
1
and
given
machine
6/11/80
one
edge
you
are
8080
2.
in
) '