Re: Which Z-80 Card Should I Keep?

[shirsch@adelphia.net (Steven N. Hirsch)]

In article <98xLPK0mjgFa9dT7Tr4+W2iC78NH@4ax.com>, John L wrote:
> On Sat, 19 Jan 2002 20:00:14 -1000, "Bryan Villados"
><news001@macgeek.org> wrote:
> 
>>I have two Z-80 cards, and I want to sell one of them. But I can't decide
>>which one to keep. They both work. The two cards are:
>>
>>- Applied Engineering Z-80 Plus
> 
> This one is better. It has a faster Z-80 processor and with the right
> bundled software (Applied Engineering CP/AM 5.x) you can run CP/M
> programs off a unidisk 3.5" drive.

The AE card operates at the same effective speed as the Microsoft one.
You could plug an 8Mhz. Z80 in if you like, but the clock rate is
synchronously locked to the motherboard signals on the "traditional"
softcards.  Only devices which used ports for inter-CPU communication
were able to go faster (e.g. PCPI Applicard, which could be easily
modified to run a Z80H at 8Mhz.)


> BTW, anyone here running CP/AM 5.x  with a Z-80 Plus card ?

Yes.  I actually wrote most of the extended device support and setup
utilities for the AE card back in 1985-86.  Fun project, and it taught
me a LOT about Z80 and 6502 assembly coding.