Re: info cpm board for cbm 8032

From: Ruud_at_Baltissen.org Date: Tue, 17 Nov 2009 18:36:20 +0100 Message-ID: <4B02DF14.13406.3C7347@Ruud.Baltissen.org>

Hallo Didier,

As promised: http://www.baltissen.org/images/z80card.jpg

The unpopulated socket is meant for a 6502. As the you can see there 
is no EPROM onboard. The unpopulated 24 pins socket is NOT meant for 
an ERPOM. Pin 1 and 3 are connected to ground, pin 12 isn't. Pin 2 
is connected to +5V, pin 24 isn't. I have no idea at all what could 
fit there.

The Z80 communicates with the 6502 through the 6821/PIO combination. 
And even there are anomalies; the pins are connected to each other 
in a weird way (or I did something wrong). That rules out that the 
Z80 could address the $A000 expansion for example.

--
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