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Vector ZCB Single Board Computer
2.2.2 MWRITE enable/disable
Jumper area
D
Connections as manufactured:
jumper installed
Function: when connected, the
ZCB board will generate the MWRITE signal
(S-lOO line 68).
You will want
to
disconnect this jl.lITper if there is some
other source of MWIDTE in the system, such as a front panel.
Options:
if
MWRITE generation is not wanted, cut the jumper in area D.
2.2.3 Autanatic WAIT state disable/enable
Jumper area
N
Connections as manufactured: pads 1 and 2 are jumpered (wait on Ml)
Function: wnen enabled, this options permits the automatic generation of
WAIT states according
to
the following.
When pads 1 and 3 of jl.lITper area N
are jumpered, no automatic wait states are enabled.
When pads 1 and 2 are
jumpered, an automatic wait state is inserted only after the Ml machine
cycle.
If no pads are jumpered, one automatic 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 jumper between pads 1 and 2 and install a jumper between pads 1 and 3.
2.3
EPRa1/RAM SECTION
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 from 3K to
12K bytes of EPROM on the single board.
The EPROM type chosen directly
determines the address ing scheme used.
See the appropriate section below
for the EPRCM
type
you have chosen.
See appendix section for important imforrnation regarding PRCM addressing on
current ZCB boards.
2-2
Rev. I-B 6/11/80
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