24 Dec
2010
24 Dec
'10
8:24 p.m.
On 12/24/2010 9:54 PM, Dave McGuire wrote:
On 12/24/10 8:47 PM, Alexandre Souza - Listas wrote:
Is there a link handy to a minimal schematic. Alexandre's question
piqued my curiosity, so I went looking, thinking there would be a ez80
Acclaim + SRAM + SD, using the RS232 for a terminal. I can't find
anything that minimal.
If true (I'm happy to be wrong), I agree a small board with the minimal
components might be useful to a wide range of people. But, it would
require someone who can write a BDOS for it.
Jim
--
Jim Brain, Brain Innovations
brain at jbrain.com
www.jbrain.com
www.jbrain.net (eStore)
I'll try to ask a different question here
What is needed to CREATE (and not build) a CP/M compatible computer?
Now it got me puzzled. I have some circuit adaptations of MSX and TRS-80
computers, as minimal computers to run CP/M code. But what is needed -
beyond Z80 and 64K of RAM - to run CPM? Is there any kind of doc
discussing it?
Very little is required beyond a CPU and memory. First, a Z80 isn't
required; you can use an 8080 or an 8085. (or one of the later Z80
implementations) You also don't need 64K; CP/M will run in much less,
16KB I think was the minimum.
Beyond that, you need some sort of ASCII textual console device
(like a serial port, or a video subsystem + keyboard interface) and a
mass-storage device.
That's it!
-Dave