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Old 8th Jul 2019, 9:35 am   #138
john_newcombe
Hexode
 
Join Date: Apr 2019
Location: Skipton, North Yorkshire, UK.
Posts: 252
Default Re: Gemini 80-Bus System

The RP/M monitor, as I am sure you know behaves like a cassette based CP/M and so the transient area starts at 0100. Would the following code, loaded at 0100h be enough to pulse the IVC's CPU reset from the CPU Board?

Code:
21 B3 00    loop:   ld hl, 0x00b3           ; port B3
7E                  ld a, (hl)              ; read 
77                  ld (hl), a              ; then write
18 F9               jr loop
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