Re: CP/M cartridge
Date: 2000-03-28 21:37:07

Hallo allemaal,

> Funny thing, and I don't know if anyone else has noticed this, is that
> when I used my CP/M cartridge, I would have to try about a billion times
> to get it to boot, but once it did boot, it would work for as long as I
> cared to use it for (which, to be honest, wasn't ever very long since it
> was so dang slow). Just an observation I thought I would throw in there.
> :)

The times I used I never had problems booting except for the fact that the 
resetbutton did "not" work. 

> when the internal bus on the Z80 is in a "float" condition, the address
> multiplexorss on the CPM cart are exposed to a voltage that is neither a "1"
> nor a "0"

This remark I do not understand. There are no multiplexers on the card, only 
buffers. The Z80 itself is only tri-stated when the 6510 is active. It even is 
not tristated when the VIC-chip is in command. In this case the buffers are 

The moment I'll find my own cartridge again, I'll revise my SCH and give an 
technical explanation with it.

Groetjes, Ruud

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