8-bitters and multi-whatever
Roy J. Tellason
rtellason at verizon.net
Mon Sep 10 15:12:00 CDT 2007
On Sunday 09 September 2007 23:23, Dave McGuire wrote:
> On Sep 7, 2007, at 11:49 PM, Roy J. Tellason wrote:
> > Unfortunately instead of RS232 Televideo has something else going
> > there (RS422?), not easy to interface too, and they distribute their
> > "network" out amongst what other Televideo boxes you have, which in my
> > case is none.I guess with an S-100-based system you could always add more
> > cards, and somehow or other make it work.
> They were RS422 if memory serves.
Probably. I never could keep those straight. I remember reading up on it at
the time and that it was some kind of differential-current interface, and I
might even have the datasheets for the chips they used, though heaven only
knows where I'd get one if I needed one (probably ask on this list :-).
> I worked at a computer store when I was in high school, from 1984 to
> 1986...we used one of those > Televideo distributed CP/M-ish systems (810?)
> there, for store operations/POS/inventory stuff. It worked very well and
> was reliable, but it wasn't very fast. Our POS and inventory system was
> written in CBASIC-80. It was good stuff.
The difficulty I see is that if I were to ever want to try and use one of
those I'd have to find hardware that would talk to it. Though I *did* get a
hold of an ISA card with a boot rom that wanted to talk to that. I haven't
the assembly skills to do a dump of it and see what it's trying for, but
apparently it wants to load some file from the other end and of course isn't
I guess if I'm ever gonna do anything with that box I'm gonna have to find
some more TeleVideo hardware.
Got a 40M _eight inch_ HD in it, along with a tape drive, I forget what kind
but the book tells me that it stores a whopping 14MB. :-) The HD is
belt-driven, and that slipping was I think one of the difficulties I was
having the last time I tried to boot the machine. Don Maslin (sp?) sent me
another belt, but I never got around to putting it in there.
Too bad those aren't rs232 ports, that box could be useful for some things
even if I never went anywhere near the original application.
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
Information is more dangerous than cannon to a society ruled by lies. --James
More information about the cctalk