Minimal CP-M SBC design
ethan.dicks at usap.gov
Sun May 11 08:01:31 CDT 2008
On Sun, May 11, 2008 at 08:23:13AM -0400, Dave McGuire wrote:
> Well I wasn't talking about a diskless system...only one in which
> CP/M itself was in ROM.
I personally find the idea intriguing, and I am about to cobble up
a system from (nearly) scratch. I used Kaypros and the like, back
in the day, and really won't miss floppies (not that there's an FDC
chip within 3000 miles I could slap on this thing, anyway).
I don't mind the idea of stuffing "the OS" in ROM vs loading off
of removable media since I doubt I'll want to upgrade. I want to
run a few CP/M-80 programs, and that's about it.
> >I still don't have the hang of this "vintage" thing yet, probably
> >because I'm vintage myself. Please forgive my density...
> I often suffer from the same problem. I think very few of us, even
> here, actually used stuff like CP/M and PDP-11s when they were
> considered current technology.
I was a kid when S-100 machines were "in", but, as came up earlier
in this thread, I did hit the Osborne/Kaypro CP/M era.
I consider myself quite fortunate that I've gotten to program PDP-11s
on two different jobs right at the tail end of their heyday (I was 18-20
at the time). I also consider myself fortunate that I was working at
a place that supported VAX/BSD customers in addition to our VAX/VMS
customers, so I was able to pick up some UNIX skills nearly 25 years
ago. When folks bandy about "All the World's a VAX", it really means
something to me (I learned C from K&R on an 11/750 running 4.1BSD, so
I _know_ how easy it is to write non-portable code).
I do run things inemulation, but I also enjoy running things on real
iron. Right now, I have a modern Elf within reach, as well as an
SBC6120. The SBC6120 boots off of CF... no floppies, no 1/3 HP rotating
media, but there's still a real 12-bit processor on the board. I don't
consider that emulation in the slightest, even if my "disks" don't rotate.
OTOH, I also have, at home, "real" PDP-8s with real DEC-made disks; they
just aren't so portable as to be worth hauling down here. Same goes for
a CP/M machine - I'm working on something smaller than a princess phone.
Quite portable compared to an S-100 or an Osborne.
Just my take on why I mix classic CPUs with modern peripherals... runs
the original software, weighs a lot less.
Ethan Dicks, A-333-S Current South Pole Weather at 11-May-2008 at 12:40 Z
South Pole Station
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Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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