Vector Graphic ZCB User manual

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ZCB SmGLE OOARD. mtPt1I'ER
Revision 1
USER I S MANUAL
Revision B
JlB'le 11, 1980
Ccpyright 1980 Vector Graphic Inc.
7200-0203-03-02

Vector ZCB Single Board CCJtplter
Section
Table of Contents
Specifications
I. Perspective
1.1 The ZCB as a system •••••••••••••••••••••••••••••• ~ ••••••••• l-l
1.2 The ZCB as part of a system •••••••••••••••••••••••••••••••• 1-1
1. 3 c::l'{J sectiOll ••...••••.••••.................•.............•.. 1-1
1.4 ~ section .•...•..•••••.••......••.•................ 1-2
1.5 I/O sectial ••••••••••••• ~ •• o ••••••••••••••••••••••••••••••• 1-2
1.5 .• 1 Serial Ports Generally •••••••••••••••••••••• e •••••••• 1-2
1.5.2 Serial Asynchronous Communications ••••••••••••••••••• 1-3
1.5.3 Serial Synchronous Communications •••••••••••••••••••• 1-3
1.5.4 RS-232C Theory ••••••••••••••••••••••••••••••••••••••• 1-4
1.5.5 RS-232C on the ZCB ••••••••••••••••••••.•••••••••• e ••• 1-5
1.5.6 Paral.lel l?C)'rts ••••••••••••••••••••••••••••••••••••••• 1-6
II. User's Guide
2.1 Introduction ••••••••••••••••••••••••••••••••••••••••••••••• 2-1
2.1.1 Standard Jumpering and what it does ••••••••••••••••• 2-1
2.2 Cl?U Sec-tial •.••••••.••••••...•••• 0 ••••••••••••••••••••••••• 2-1
2.2.1
2.2.2
2.2.3
Running the system at 2 or 4 MHz •••••••••••••••••••• 2-1
~ erlable/ disable •.' ....... It ••••••••••• e ••• III ..... • 2- 2
Auto WAIT state erlab1e/disab1e •••••••••••••••••••••• 2-2
2. 3 ~ SectiCll"l •••••••••••••••••••• ' •••••••••••••••••••••• 2-2
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2708 EPRCMAddressing ••••••••••••••••••••••••••••••• 2-3
AuXiliary Memory Disab1e •••••••••••••••••••••••••••• 2-4
2716 EPROM Addressing ••••••••••••••••••••••••••••••• 2-5
2732
EPROM Addressing ••••••••••••••••••••••••••••••• 2-6
Enable on-board EPROM on boot ••••••••••••••••••••••• 2-6
Phantan enab1e/disab1e •••••••••••••••••••••••••••••• 2-7
Jumper areas K, Land M ••••••••••••••••••••••••••••• 2-7
2.4 I/O Sectial •••••••••••••••••••••••••••••••••••••••••••••••• 2-7
2.4.1
2.4.2
2.4.3
2.4.4
Rev. 1-8 6/1l/80
I/O Pc>rt Mdressing ••.•••••••••••••••••••.•••••••••• 2-7
Address Mirroring disab1e/enab1e •••••••••••••••••••• 2-9
Asynchronous
Serial Baud Rate Se1ection ••••••••••••• 2-11
HOw to connect most serial terminals and printers ••• 2-11

Section
2.4.5
2.-4.6
2.4.7
2.4.S
2.4.9
Vector ZCB Single Board Ccltplter
~
How to connect. JOOSt low speed accustic cooplers ••••• 2-15
COnnecting-additional RS-232C handshaking lines ••••• 2-l5
USing the Parallel Ports •••••••••••••••••••••••••••• 2-lS
COnnecting Sprint 3 to ZCB •••••••••••••••••••••••••• 2-l9
Connecting Vector MP to ZCB ••••••••••••••••••••••••• 2-19
2.9 Spare
Clip- and Patch areas ••••••••••••••••••••••••••••••••• 2-20
III. 'lheory of Operation·
3.1 System operation Block Diagram ••••••••••••••••••••••••••••• 3-l
3.2 Serial Ports ••••••••••••••••••••••••••••••••••••••••••••••• 3-2
N. Schematics
Rev. l-B 6/ll/S0

vector ZCB Single Board COtplter
canpatibility:
Po\oter Requirements
Availabili ty:
EPRQ1s included with
board
Mem:n:y Speed
SPOCIFlCATICNS-System
Most 5-100 systems.
+8VOC @ 970 rna. (typ.)
+16 VDC @ 120 mao
-16 VDC @ SO rna.
Shi~ assenbled, tested, burned in ~ no kits.
SPECIFlCATIctS-EPRCM/RAM
65536 bytes addressable, 1024 bytes RAM on board,
3 EPRCM sockets on board, up to 12K addressable
nooe
RAM: 300ns.
EPRCM: User selected (450. ns. typical)
RAM: 2114 static
EPROM: 270S, 2716, 2732
Standard r.ocatiat of EOOOH-E7FEH
Systems ~i tor EPIOt
1?oWer-on~set Junp Auto bOot on power on/reset, jl.mpS to rneIID1:Y location
Options EOOOS. Shipped enabled.
SPOCIFlCATICNS-CPU
Processor Z-SOA
Nunber of Data Bits
S
N\:mt)er of Mdress Bits 16
Instructions
Clock speed
Interrupts
I/O devices
Dynamic RAM
Rev. I-B 6/11/80
15S, including all 78 S080 instructions
2 or 4 MHz, j~r selectable, enabled for 4 MHz.
Z-SO Mode 0 (SOSO rro::1e), MODE 1, mDE 2
256
I/O addresses
Supports dynamic mem::>ty by sending Z-80 RFSH
on bus line 66 ~ fast resetlJ;:ower on clear signal
generated on board.

•
Static RAM
MWRITE
wai t state generation
for memories slower
than 300 ns.
Bus !Dad
Bufferin;
Phantan:
Mirrorin;
. capacity
vector ZCB Single Board catpJter
Fully canpatible
Jumper option to generate MWRITE on board
Standard: option enabled.
3 options: generate one wait state on each bus
cycle, generate one wait state after each Ml
instruction, generate no wait states.
Standard: generate one wait state after each Ml
instruction.
1 stamard T1'L load .on all inputs
Fan out: 15 standard (60 low power shottky)
OUtput buffer disable canpatible with Vector Graphic
~ Boards, which generate phantan in response to
Power-on-clear (PCX:). Jumper selectable: on/off.
Standard: enabled
Standard: enabled, can be disabled.
SPECIFlCATICt&-I/O . ,,.--.;)
1 serial RS-232 and 3 8-bitparallel ports programnablt:.
as input or output.
Serial port 1, using 8251 controller chip.
Port addresses Any increnent of four fran OOH to FFH. Preset
addresses are: Data, 04H (echoed on 06H) 1
Control, 05H (echoed on 07H.)
Signal levels EIA RS-232C
RS-232 handshakin; Typical handshakin; is provided, ie. RI'S, ers, OrR,
DSR, etc.
Asynchronous
Rates
Data bits
Step bits
parity
Uo-9600 baw (switch selectable)
5 - 8, programnable
1, 1 1/2, or 2, programnable
Even, ood, or oone, programmable
Rev. l-B 6/11/80

,. ~ -~
vector ZCB Single Board COtplter
Synchronous
Rates
Synch detect
Clock
Parity
Data bits
Sync character
Parallel Ports
Port Addresses
latching
Signal level
N\..mi:)er of lines
rata transfer
cable
Rev. 1-8 6/11/80
OC-56K.
can be wired for internal or external synch.
8251 SYNDET line is not connected.
N:lt now connected to the external \4\Orld as required
for synchrcnous operatioo.
Even, odd, or none, progranmable
5 - 8, programmable
Single or double synch character can be progtaliiled.
2-8 bit, 2-4 bit can be programned as 3-8 bit. Uses
an 8255 parallel I/O controller chip.
Any increment of four fran OOH to FFH. Preset
addresses are: :Ebrt A, 08H; Port B, 098; :Ebrt C, OAH
and the Cootrol Status Register at 000.
output latched, input not latched.
Tl'L (i.nt:ut = 1 low power Tl'L load; output drives 1 'l"l'L
load) •
8 lines per channel, progranmable for input or output.
+5 VOC and GND are also provided.
OVer lOOK bytes/second.
Cptional. Has 34-pin female connector and 34-line
ribbon cable. N:l connector is at the other end,
allowin3 user to configure as required. r-tlst be
ordered separately.

vector ZCB Single Board c.atplter
I. PERSP&:TIVE
1.1 '!be ZCB as a system
The Vector Graphic ZCB Single Board canputer provides the capability of a
canplete canputer system on a single toard. '!be ZCB rontains what you ~uld
normally find on a CPU board, a PROM/RAM board and an I/O board, all
rontained on one 5-100 bus canpatible board. -
'!be ZCB contains a Z-aOA miCtopLocessor, 1024 bytes of static RAM rnerII)ty,
sockets for up to 12K of PRQ1, one serial I/O port and three 8-bit parallel
ports. Circuitry is provided to support static or dynamic merrcries. All
5-100 8080 signals are also generated making the ZCB compatible with 8080
based systems. ~ power regulation and filtering is provided using IC
regulators and heat sinks _for power dissipation. Input loading on the bus is
1 low power 'r!'L load while - ootput fanoiit is 10 'tTL loads. .
While the ZCB does replace 3 boards in a typical system, it is not a
complete stand alone microcallputer on one board. A tenninal device of sane
sort is needed as ~ll as additional RAM mem:n:y, for rrost applications. The
ZCB could, however, be used as a complete microcollplter in many process
control applications. In this case, preprogrammed PROMs (up to 12K bytes
worth) could be used on a ZCS board. that was Eqripped with a power supply.
Sense data ccW.d arrive by an input parallel p:Jrt, be processed by the CPU
section of the board and any data output (ca1trol signals, for instance)
could be ccmmunicated to the equipnent via the outp~t parallel port. The
data input and a SlIt'I'IBry of actions taken rould be cx:mnunicated to a central
data processing location by the serial PJrt. Thus the ZCB might be used as
an intellegent node on a ~lete process control system, which rould decide
and provide ootput bmmediately and provide information to a higher level
data proceSSill3 system.
1.2 '!be ZCB as part of a system
In most applications, h9Wever, the ZCB will be used a ~rt of a canplete
Vector Graphic microcuuputer system. Since 3 boards are replaced by one,
. significant cast savings are realized. It _also reduces the physical size of
the overall ccmputer that it is used with by freeing up two 5-100 slots.
Demands on the };:OWer supply are also reduced, thereby lightening the load on
the canplete system.
The ZCB carbines the IOOSt used features of 3 boards.: CPU board, PRaVRAM
board and SerialjParallel I/O board.
1.3 CPU section
The Vector Graphic ZCB is designed around the powerful Z-80A
mictq?rocessor. '!be board is 5-100 bus ccmpatible. All input and output
lines are fully buffered. tDading on the bus is no nore than one standard
'r!'L load. In addition, the board has the necessaty circuitry to work with
Rev. I-a 6/11/80
1-1

Vector ZCB Single Board Catplter
dynamic merories, such as Vector Graphic's 64K rnenory board. Simplicity of
des i9n has been s· tressed to enhance reliability of operation by the use of
MSI and LSI integrated circuits.
1.4 P10VIWI section
The PROM/RAM section features lK of on-board RAM meI'OC)ry (using 2114's)
and up to 12K of PRCM, RCM or EPRQt. Note: For the purposes of discussion
in this manual, the terms PROM, El'R<l" and RCM may be used interchangably.
Their technical distinction makes no difference in how they are used in the
ZCB. The PROM may be implemented using either 2708's, 2716's or 2732's.
This allows the user maximum flexibility with regard to choice of operating
systems, languages, etc. Several jumper options such as jump on
p::lWer-on/reset are available. h3vanced address decoding logic permits a
wide
ran9E! of addressing cptions.
1.5 I/O sectioo
The I/O section of the ZCB single board computer offers three 8-bit
parallel ports or ports programmable as input or output and one RS-232C
level serial port for interfacing with multiple perpheral devices such as
printers, nodems and terminals.
The CPU sends data to the serial and parallel ports via I/O addresses.
The I/O addresses used by the board can be changed as a group. The board
uses e igh t I/O addresses from OOH to FFH. You specify the value of the
addresses by jumper(s), as listed in Section 2.4.1. Thus, the entire range
of 256 possible port addresses may be accessed with the advanced decoding
logic built into the Vector Graphic ZCB.
The ZCB Board does not cane with arry software for specific applications,
though Vector Graphic supplies certain items of software that make use of
its features. The Vector Graphic ExteOOed Systems ~nitor 4.0 will work with
the board as it canes fran the factory without arry tredification.
1.5.1 Serial ports generally
Discussion of the serial port centers around the industry standard 8251
. tJSARI' (Universal Synchronous/Asynchrooous Receiver/l'ransmitter) chip. Much
of the flexibility of the ZCB board derives fran the flexibility of this
chip and its parallel counterpart, the 8255, both of which can be modified
via software. You, through software, can control the rate of serial
transmission, and the fotmat of the transmitted data. Data is transmitted
as ASCII code· having between 5 and 8 bits per character, with an optional
added-on parity . bi t (choice of even or odd), and wi th one start bi t and a
choice of one, one and a half, or two stop bits per character. ~r,
using the 8251, the board can handle either asynchronous or synchronous
communication. Baud rates, format, handshaking, and whether cannunication
is asynchroncus or synchronous, is specified tbroogh software and, in some
cases, hardware nodifications.
1-2
Rev. I-B 6/11/80
~.'\
I
/
- ~ .\
)

Vector ZCB Single Board catpJter
It is not within the scope of this manual to detail the functioning of
the 8251 USART chip, nor to teach the theory of serial ccmnunication. In
order to write your own communications software or to mOdify the ZCB serial
port, yoo will need to be thoroughly familiar with this chip. You can refer
to Intel's Application Note #16, entitled "Using The 8251 Universal
Synchronous/Asynchronous ReceiverjTransmitter," which Intel will provide.
This Note is also an excellent reference on basic communications theory.
More readily available references on the 8251, but ones that have less to
sc::/ about a:mnunication theory, are the "INrEL 8080 Microcomputer Systems
User's Manual," available either fran Intel or most canputer retail stores,
am Mam Osborne's "An Introduction to Microcanputers, volume II -Sane Real
Products," also available in many canputer stores.
1.5.2 serial asynchronous cc:mm.micatial
You can select the rate of transmission and reception fran a choice of
110, 150, 300, 600, 1200, 2400, 4800, or 9600 bi ts/second • You choose the
rate usin;J a small DIP-swi tch on the bocm:1.
If you are writ~ custan software, there is also a simple way to divide
the chosen rate of a port by 4, allowing sate software control of the rate
without physically opening up the computer. For example, if you have a
modem
that is switch selectable for either 1200 bits/second or 300
bits/second, you can write a program that enables the operator using the
keyboard to change the canputer
l s
rate of catmunication to match that of the
IlDdem at ar'¥ given time.
You can select via software the number of data bits in each ASCII
character, selecting either 5, 6, 7, or 8. You can also select the nuni::ler
of step bits in each character, selecting either 1, 1-1/2, or 2. Finally,
you can select whether or not a parity bit is included for each character,
and if chosen, whether or not it is even or odd parity. For how to do this
in software, see the references given earlier for the 8251 USARl'.
1.5.3 serial synchrooous <XJmI.lnication
You can enable the serial port to carmunicate in the synchronous ItDde.
Modifications to the board will be required to acccmplish this. In brief,
the 8251 SYNDEr pin and the TxC and RxC clock pins must be connected to the
outside ~rld, which is not the case in the standard configuration of the
board.
Olce set up for sync:hrornJS communication, you can select the rate of
carmunicaticn, by usinq an external clock between 0 and 56K bits/seconj. As
with asynchronous camumication, you can select via software the character
length, selecting either 5, 6, 7, or 8 bits. You can also select via
software whether or not a parity bit is included for each character, and if
chasen, whether or not it is even or odd parity. Also via software, yoo can
select separately for each port whether you are using internal or external
synchronization, and whether one or ~ synch characters are used.
Rev. 1-8 6/11/80
1-3

Vector ZCB Single Board Ccl1plter
1.5.4 RS-232C theory
This manual cannot describe the RS-232C protocol in detail. For a full
description, obtain a cc:py of the RS-232C EIA S'I'ANIl\RD document, published
by Electonic Industries Association, Engineering Department, 2001 Eye
Street, N.W., washin;ton, D.C. 20006. Alternately, if you have access to
Da tapro or Auerbach reports on cormnunications, they contain thorough
articles describing the protocol and its ~lications. The following
infocnatioo, however, will be of irrmediate relevance in this manual:
An RS-232C signal can either be POSITIVE (+12 Wc) or NmATIVE (-12 Vdc).
Positive is ON or SPACING, Negative is OFF or MARKn«;. (These te1:l1lS are
industry wide cc:nventions that date back to the days of key telegraphy.)
RS-232C line drivers typically invert these signals wilen they are converted
to and fran 'rl'L signals. Hence, RS-232C POSITIVE corresponds to TTL low
(about 0 Wc) and RS-232C NB:;M'IVE corresponds to 'l'1'L high (about 5 Wc).
An RS-232C cable consists of 25 lines. An RS-232C transmit or receive
data line carries a serial sequence of PCSITIVE and NEGM'IVE pulses that
cot'resp)nd with the characters you want to transmit or receive. There is
also associated foonating and parity information attached to the information
by the ccmnunication device such as an 8251. In addition to the transmit
and receive data lines, there are ground lines, (lines 1 and 7), and there
are handshakin; lines that are used by ccmmunication, tetminal, and caaputer
equipment to inform each other of their status (lines 4, 5, 6, 8, 20, 22,
and a few others that are rarely used). The full RS-232C protocol also
specifies a set of rarely used "secondary" lines which have the same
definitions as sane of the primary lines, but carry an independent set of
signals. Altogether there are 25 RS-232C lines defined, but most
applications use oo1y a few of then.
In the real world, vety few devices require "full RS-232C" protocol. In
fact, very few devices even require all of the handshaking lines mentioned
above. Many require one or even none. Further, many devices use
handshaking lines differently than defined by RS-232C, violating the
protocol. In short, it is oonfusing at this tine to say that a given device
requires "full RS-232C." You IIIlSt specify exactly what signals it sends and
. expects to receive on each line.
It is important to understand that most of the RS-232C lines are
directional, that is, the protocol specifies which direction the signal
travels on each line, relative to the ends of the cable. Therefore, the
protocol specifies that at one end of an RS-232C cable there must be a
device of the type called "Data Conununications Equipment", or "DeE" for
short, and at the other end there must be a device of the type "Data
Tetminal Equipnent, or "m'E" for short. The direction of the signal on a
given line can be determined once you decide which end of your cable has
which kind of device •
.'!be
terms Data Ccrmunication E):;Iuipment and Data Terminal Equipment derive
1-4 Rev. I-a
6/11/80
..' ",

vector ZCB Single Board CaIplter
from the original.purpose for RS-232C -'to connect a terminal with a
communication device such as a modem. A computer does not have to be
involved at all. Since a cx:mputer can either play the part of a terminal,
when connected to a modem, or it can play the part of communication
equiptent, when connect--eato a tetminal, a canputer serial FOrt can be used
either as OCE or lJ1'E. However, a given serial FOrt can only be wired up as
one or the other at aIrf one tUne. If the port happens to be wired up to
look like OCE, and you want to connect it to another OCE such as a rrodem,
then the RS-232C cannectioo will not ~rk.Both ends would be transmitting
on the same lines and receiving on the same lines. Before the RS-232C
connection can be made, in this case, you must rewire the CCJrq?uter' s serial
FOrt so that it receives and transmits on the lines specified for lJ1'E.
1.5.5 RS-232C on the ZCB
TO enable
the serial FOrt to ccrrmunicate over an RS-232C line, you will connect one
end of this line to the serial port socket on the ZCB boaJ:d, and the other
end, havin; an RS-232C standard 08-25 femal~ connector, to the back panel of
the computer. The cable is designed so that appropriate signals fran the
board are directed to the RS-232C lines at the DB-25 connector as if it were
Data catmunications Equitxnent. 'lbus, the resulting Il3-25 socket at the rear
of the cx:mputer is a OCE RS-232C pjrt.
Drivers are provided for the serial port to enable the 8251 Transmit Data
and Receive oata lines to input or output at RS-232C voltage levels. These
r, eceivers and drivers are already connected on the board, requiring no
jl.JIlt)erirq. When a serial I/O cable is installed these signals are connected
to RS-232C lines 3 and 2 respectively.
In addition, four of the RS-232C control lines are connected to the
appropriate pins on the 8251. These are Dl'R, I:SR, RI'S and Cl.'S. See the
table "1!ddi tional RS-232C handshakirq lines available- in Section 2.4. 2 for
the pin assignments. When a serial I/O cable is installed, these signals
are available on the cable's DB-25. 'lbere are four other signals available
fran the 8251 which can be accessed: TxRDY, TxMr, SYNDEr and RxRDY. You can
install jumpers and RS-232C line drivers to enable the 8251. to dynamically
. control any two of them via software.
FUrther, a l'IJlri:)er of other RS-232C lines are available on the board using
the standard serial I/O cable mentioned above. These are both input and
output lines, but they are not camected to anything other than pads on the
board, nor are drivers and receivers connected to them. The table "RS-232C
and Connections on ZCB Board" in Section 2.4.6 lists the functions of each
of these lines.
Any RS-232C line can be connected to +12 vrx; on the board. In addition,
for each t=Ort, the 8251 can be used to ll'Cnitor in software anyone RS-232C
handshaking line, and the 8251 can be used to control fran software the
output of any two RS-232C handshaking lines, and lastly, the 8251'5
transmi tter can be disabled or enabled by anyone RS-232C incoming
Rev. 1-8 6/11/80
1-5
._ --- .. . _ - ---- -

vector Z,CB Single Board Carplter
- -"' ",
harrlshakin:] line. '!bere is one spare RS-232C receiver aro one spare RS-232C J
driver available qn the 00ard whidl can be used to connect one input and one
output handshaking line.
For the large majority of applications, no additionalRs-232C lines will
be required other than those already connected to active catqX)nents on the
ZCB beam. '!bus the serial ports can very often be used as DeE RS-232C
input/output ports without modification. Most serial printers, and
tenninals, can be connected with little or no difficulty._
, To connect to a modem, acoustic coupler~-Or other kind of Data
Ccrrmunications Ek;IUipment, a serial port lIllSt be cooverted into a orE RS-232C
port. 'lbis , can either be d.one by dlanging the boan:3 wiring slightly or by
attaching a Null Modem cable to the external oa-25, which accanplishes the
sane thing. However, if l&-232C handshaking is required, other than the
lines already connected, then additional IIDdifications to the board will be
necessary as explained in 'Section 2.4.$. '
Of course, software is necessary in order to operate specific devices
connected to the serial port. Section 2.4 gives the standard I/O port
addresses and instructs you how to dlange them as necessary. Other documents
fran Vector Graphic describe ' the particular I/O addresses and peripheral
devices whidl eadl Vector Graphic soft\ere product controls.
For example, at the t.ime of this writing, any Extended Systems Monitor
having option C enables a standard serial terminal to be plugged directly
into the seriaL The Version 4 Extended Systems Moni~or (any option)
contains a progran that enables . the cperator to ccmnunicate to a time share
service via a lrodeIn connected via an RS-232C cable to the serial port which
has to be converted to a r:7rE port first. Lastly, operating systems such as
MOOS and CP/M from Vector Graphic, and Vector Graphic's Word Managagment
System, output to printers via the serial port.
1.5.6 Parallel Ports
The ZCB has three independent parallel input or output ports, called
Parallel Ports A, 8 aro C. '!hey are connected to ' the outside 'NOrld via one
34-pin connector whidl is l10Jnted on the .tcp of the cam. vector Graphic
'supplies an optional 34-line ribbon cable that connects to this edge
connector. The other end of this cable has no connector on it, allowing you
to configure it as desired. Many of the 34 lines are not used, as discussed
below.
Each parallel port has eigh 't pins which can be p~ogrammed for input,
output or, in the case of Port C, control. 16 different canbinations are
possible in l-tJde 0, nore are available in ~es 1 and 2. See Intel's 8080
Microcomputer Systems User's Manual for nore information on ~es 1 and 2.
Additional pins provide +5 VOC and GND. Exact pin assignments are given in
Table 12 in Section 2.8.
Input and output is accomplished using IN(put) and OUT(put) machine
1-6 Rev. 1-8 6/11/80
) '

vector ZCB Single Board Carplter
language instructions within software prepared for-specific applications.
Output is latched on the board, so that after an OUT instruction is
executed, the eight bits of data remain available to the external device
until the canputer dlanges it. Input is mr latched, so that software must
be written to sense in sane way that data is available and to input that
data. '.1llere are no interrupt lines connected to the parallel ports.
Rev. l-B 6/l1l80
1-7

vector ZCB Sir)gle Board catp.tter
II. USER I S GUIDE
2.1 Introduction
The User's Guide explains how the board functions as manufactured and
tells how to change various user selectable cptions by zreans of jumpers and
switches to fit other than standard requirements. The User's Guide is
divided into 3 sections to cover the three main areas of board operation:
CPU section, EPRCM/EW't section and I/O sectioo.
2.1.1 Standard jtmJ)erin9 and what it does
The Vector Graphic ZCB single board c::atpUter has been prejunp!red at the
factory to fit current Vector Graphic Microcallputer Systems. If ~ wish to
use the ZCB in another model computer or one of your own design, the
follCJWin3 infocnation will prove useful.
'lbe st.andartl jl.JDPering does the following:
2.2 CPU SEX:TIaI
2708
EPRCM' s are selected for 2 Pro-t sockets.
2716 EPRCM selected for 1 PRCM socket.
EPRCM base address is EOOO.
1K on-board merrDry is adda!ssed at FCOO.
Serial port is addressed at 04(control) and 05(data)
(Same information is duplicated at addresses 06 and 07)
Parallel ports A,B,C and Control Status Register are
addressed at 08,09,OA and OB, respectively.
Clock speed, 4MHz.
Mwri te is enabled
Q'le wait state is inserted on each Ml cycle.
On-board EPRCM is enabled to boot on reset.
Phantan (line 67) is enabled.
2.2.1 IUuti.r¥J system at 2 or 4 fEz.
Jumper area: A
Connections as manufactured: pad 1 jl.Jll1?ered to pad 2
Function: selects 2 or 4 MHz. qJeratioo. 'lbe Z-80 CPU is capable of 4 r-tiz.
operation but some peripheral boards are not. The board is shipped for
operation at 4 Mhz.
Options: to operate at 2 MHZ, cut the jumper between pad 1 and 2 and
install a jumper between pad 1 and 3~
Rev. 1-B 6/1l/80
2-1

vector ZCB Single Board CCJTplter
2.2.2 MWRITE enable/disable
Jumper area: D
Connections as manufactured: jtmp!r installed
Function: when connected, the ZCB board will generate the MWRITE signal
(S-lOO line 68). You will want to disconnect this junper if there is some
other source of MWlUTE in the system, such as a froot panel.
Options: if lwMUTE generation is not wanted, cut the jtmp!r in area D.
2.2.3 Alltanatic WALT state disable/enable .
Junq;:ler area: N
Connections as manufactured: pads 1 and 2 are j~red (wait on Ml)
Function: When enabled, this options permits the autanatic generatioo of
WAIT states according to the followin;J. ~en pads ·1 and 3 of junper area N
are j umpered, no au tanatic wait states are enabled. When pads 1 and 2 are
jumpered, an autanatic wait state is inserted only after the M1 machine
cycle. If no pads are jumpered, one autanatic wait state is inserted on
every bus cycle
Options: To insert one wait state after every bus cycle, cut the jumper
between pads 1 and 2. To disable wait state generation by the ZCB board cut
the jmtper between pads 1 and 2 and install a jumper between pads 1 and 3.
2.3 . EPlO!/RAM SEC.'ICN
The Vector Graphic ZCB Single Board Computer presents the user with
unprecedented flexibility in EPROM type choice and address selection. You
can choose from 2708, 2716 or 2732 type EPRCMs, giving the user fran 3K to
12K bytes of EPRCM 00 the single board. The EPROM type chosen directly
determines the addressing schetre used. See the awrq?riate section below
for the EPROM type you have chceen.
see appendix sectioo for ilrpJrtant imfocnation regardin;J POCM address ing on
current ZCB boards.
2-2
Rev. 1-8 6/1l/80

Vector ZCB Single Board COrplter
2.3.1 2708 EPOCM Addressing
2708 type. EPROMs are the....:.:..easiest type of PRa-t to chese ••• they are the
factory standard and the board is prejumpered to use them. The standard
jumpering of the ZCB provides for the Vector Graphic 4.0 Monitor addressed
at EOOOH.
The board is prejumpered to use 2708's at the following memory
addresses:
PRCM 1· 020
PRCM 2 - 021
PRCM 3 022
EOOOH-E3F:EB
E400H-E7F:EB
a:OOH-EFFFH
RAM U2~,25 FCOOH-FFFFH
The span between FOOOR and FBFFH is taken up, in the s~ Vector
System, by the Flashwriter II board and the Disk Controller board. There is
a 1K gap in merrory fran ESOOH to EBFrn if standard jumpering is used.
If you want to change EPROM/RAM memory addresses within the.memory
address block EOOOH to FFFffi, use the followiDJ procedure.
1·) Subtract EOOOH fran the desired PRCM or RAM base address.
2) Consult the 1K coluIm of the Palative .Address (bart (below) to deter.ni.ne
the jumper area F pad IUJ1'lt)er MliCh corresponds to the result obtained in .
step 1.
3) Consult the Area F EPRao1/RAM SOcket Pad Chart to detetmine the pad IUJ1'lt)er
of the particular socket ycu ~ to change.
4) SOlder a jumper between the twg pads.
5) Olt away art:! pre-existiDJ jumpers as necessary.
Relative Address Olart
Increment 1K .2K 4K
Area F Pad No. Call-addresses 1n hex)
14 000O-03FF 0000-o7FF OOOo-OFFF
13 0400-07FF . - 0800-0FFF 100o-1FFF
12 0800-0BFF· 100o-17FF 200o-2FFF
11 OCOO-OFFF 180o-1FFF 3000-3FFF
10 100o-13FF 200o-27FF 400o-4FFF
9 1400-l7FF 28Qo-2FFF SOOo-SFFF
8 180o-1BFF 300Q-37FF 600o-6FFF
7 lCOO-lFFF 380o-3FFF 700o-7FFF
Rev. I-a 6/11/80
2-3