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The auto-jump feature can be disabled by removing the 74LS175
chip from location 4G.
ON-BOARD PROM OPTION
The ZPB has provision for one on-board 2708 type EPROM.
The
PRO~l
address can be specified by jumper wire selection (5E) to start
on any lK address boundary.
The address comparison to test for
on-board PROM addresses is'performed by the exclusive-or gates
(5C, 5D) The PROM is enabled (PROM-EN) if the high order 6
address bits compare during a memory read operation.
A wait
state is provided for the PROM so that the rest of memory may run
at full speed.
27
North Star z80A PROCESSOR BOARD
_.
~ - .
__ ._ ....
~ _
......
~._._
--v'
.
~
Imrm _ _...._
___UJ.
..1...
,1/J;IiI
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