[Coladam] Memory expander

Geoffrey Oltmans oltmansg at gmail.com
Wed Aug 1 16:11:35 CEST 2012

I was thinking I might just make a CP/M program to do this. I'm sure
SmartBASIC would work just fine as well though. Main reason for doing a
CP/M program would be to brush up on my Z80 assembly. I've been wanting to
make a CP/M 3+ BIOS for a long time, (I think I've seen some indication you
were interested in that at one point too) so I think I'll start working on
that too. I figured the memory expander would be nice to have maxed out
just for the sake of working on a proper banked CP/M BIOS...but I'm sure
that could also be done with a 64k expander as well.

On Wed, Aug 1, 2012 at 4:23 AM, Rich Drushel <drushel at apk.net> wrote:

> On Tue, July 31, 2012 11:13 pm, Geoff Oltmans wrote:
> > Also, anyone have a copy of a RAM tester program handy? I used to have
> one
> > that would test up to 256k from the MI card, but I have no idea where
> this is
> > now.
>      Geoff, by chance do you have a copy of my SmartBASIC 1.x?  If so,
> a program to check the size of RAM is fairly trivial (the enhanced PEEK
> and POKE commands can take a bank number argument, and all the necessary
> bank-switching magic is taken care of).  Just a FOR-NEXT loop writing to
> the same address in each bank in turn, and seeing if you get back what you
> wrote; when you start getting garbage back, you have exceeded the size of
> your
> XRAM expander card.  Let me know and if so, I can write the program and
> send it to you (probably even post it to the list, it would be short
> enough).
>      If all you have is regular SmartBASIC 1.0, then you have to handle the
> bank-switching through machine code POKEd into "safe" places (i.e., where
> it won't get switched out when you do a bank switch and CALL it).  It has
> been 15 years since I programmed regularly at that level, so I would have
> to do a bit of research and relearning.  However, I bet that some ANN disk
> somewhere has a SmartBASIC 1.0 program that can do this.
>      *Dr. D.*
> --
> Richard F. Drushel, Ph.D.            | "They fell:  for Heaven to them no
> hope
> Department of Biology                |  imparts / Who hear not for the
> beating
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> Cleveland, Ohio  44106-7080  U.S.A.  |         -- Edgar Allan Poe,
> "Al-Aaraaf"
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