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vector ZCB Single Board Computer
II.
USER'S GUIDE
2.1
Introduction
The User's Guide explains how the board functions as manufactured and
tells how
to
change various user selectable options by means 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/RAM section and I/O section.
2.1.1 Standard jumpering and what it dces
The Vector Graphic ZCB single board computer has been prejumpered at the
factory
to
fit current Vector Graphic Microcanputer Systems.
If
you wish to
use the ZCB in another model computer or one of your own design, the
following information will prove useful.
The standard jumpering does the following:
2708 EPROM's are selected for 2 PRCM sockets.
2716 EPRCM selected for 1 PRCM socket.
EPRCM base address is EOOO.
lK on-board merrory is addressed 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.
Mwrite is enabled
One wait state is inserted on each Ml cycle.
On-board EPRCM is enabled to boot on reset.
Phantan
(line 67) is enabled.
2.2 CPU SECrION
2.2.1 Running system at 2 or 4 MHz.
Jt.nTIper area
A
Connections as manufactured:
pad 1 jumpered to pad 2
Function: selects 2 or 4 MHz. operation.
The Z-80 CPU is capable of 4 MHz.
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
bet~en
pad 1 and
3~·
Rev. I-B 6/11/80
2-1
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