User`s guide

Vector ZCB Single Board Canputer
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 q>tions by neans 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 does
The Vector Graphic ZCB single roard canputer 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 infonnation will prove useful.
The standard jumpering does the following:
2.2 CPU SECrIGl
2708 EPROM's are selected for 2 PROM sockets.
2716 EPROM selected for 1 PROM socket.
EPROM base address is EOOO.
lK on-board menory is addressed at FCOO.
Serial p::>r.t is addressed at 04(control) and 05(data)
(Same information is duplicated at addresses 06 and 07)
Parallel p::>rts A,B,C and Control Status Register are
addressed at 08,09,OA and OB, respectively.
Clock speed, 4MHz.
Mwri te is enabled
One wait state is inserted on each Ml cycle.
On-board EPROM is enabled to boot on reset.
Phantan (line 67) is enabled.
2.2.1 Running system at 2 or 4 MHz.
Jumper area A
Connections as manufactured: pad 1 jumpered to pad 2
Function: selects 2 or 4 MHz. q:>eration. The Z-80 CPU is capable of 4 MHz.
operation but same 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 be~n pad 1 and 3.
Rev. l-B 6/11/80
2-1