25 Jan
2002
25 Jan
'02
10:21 a.m.
Hi!
any help finding out what items are missing from my want list
(and of course from my collection) would be VERY APPRECIATED!
Want-List:
http://www.homecomputer.de/pages/f_want.html
Have-List:
http://www.homecomputer.de/pages/f_gallery.html
Please note that this list only covers HOMEcomputer and
not micro/business-computer although the destinction is of
course not that easy to make - at least I have a kind
of "working-definition":
http://www.homecomputer.de/pages/faq.html#items
Stefan.
www.HomeComputer.de
26 Jan
26 Jan
2:04 p.m.
What!!! No OHIO SCIENTIFIC???
----- Original Message -----
From: "Walgenbach, Stefan" <walgen(a)e-Spirit.de>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, January 25, 2002 1:21 PM
Subject: Request for Review ...
Hi!
any help finding out what items are missing from my want list
(and of course from my collection) would be VERY APPRECIATED!
Want-List:
http://www.homecomputer.de/pages/f_want.html
Have-List:
http://www.homecomputer.de/pages/f_gallery.html
Please note that this list only covers HOMEcomputer and
not micro/business-computer although the destinction is of
course not that easy to make - at least I have a kind
of "working-definition":
http://www.homecomputer.de/pages/faq.html#items
Stefan.
www.HomeComputer.de
5:42 p.m.
--- Jack Noble <apple(a)cmc.net> wrote:
What!!! No OHIO SCIENTIFIC???
I wouldn't mind finding some of that - and _I'm_ in Ohio! I used a
C3 owned by a family friend around 1978, give or take a year. At
one point, I had a C4P mainboard, but I gave it to Hans Franke when
I visited him a couple of years ago.
The C3 was kinda cool - my experience up to that point was PETs and
TRS-80s, etc. It was wild to see a box with multiple CPUs that you
selected depending on what you were going to do. One was a 6502,
and I expect one of the others was either an 8080 or Z80, but I never
did get to see under the hood.
-ethan
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27 Jan
27 Jan
2:37 p.m.
From: Ethan Dicks <erd_6502(a)yahoo.com>
The C3 was kinda cool - my experience up to that point was PETs and
TRS-80s, etc. It was wild to see a box with multiple CPUs that you
selected depending on what you were going to do. One was a 6502,
and I expect one of the others was either an 8080 or Z80, but I never
did get to see under the hood.
C3's are cool. I have two of them, among other OSIi. ;) One, a C3-SI
with a C2D dual 8" floppy system using the 530 board (I think) which has the
z80, 6800, and 6502 all on board. I wish I could find the OSI 460Z board
(and additional backplane? ANYBODY??) that adds the Intersil 6100 and some
other microprocessor too to the base 3 of the C3. (If they had just jammed
the CDP1802 in there too I could have prossibly settled on this one machine
to collect...those bastards...) My other C3 is a C3C12 business unit with
a 23 meg HD, a 555 network board untested still because I don't have a rack
for it. Wish my next door neighbor had one of these systems too, it'd be
cool to see two of 'em networked..
Anyway, this and other machines of mine may soon be available for scheduled
visits at your own location. Stay tuned....
;)
- Mike: dogas(a)bellsouth.net
28 Jan
28 Jan
2:44 a.m.
New subject: C3-SI
--- Mike <dogas(a)bellsouth.net> wrote:
From: Ethan Dicks <erd_6502(a)yahoo.com>
That's the one! We had a family friend who put himself in serious hock
for one of those when it was new. I got to go over and play with it
The C3 was kinda cool... It was wild to see a box with multiple CPUs...
C3's are cool... One, a C3-SI with a C2D dual 8" floppy system using the
530 board (I think) which has the z80, 6800, and 6502 all on board. from time to time. He might have gotten it to drive
one of those T-shirt
printing rigs - remember those in the Malls in the late 1970s?
They
would take a bad picture of you and/or your family and put it on shirts,
cloth calendars, etc... He loaned the whole shebang to a "Junior
Achievement" post in the early-to-mid 1980s and they broke it. I lost
track of him and it after that. I should see if he is a) still alive and
b) if he has any parts of it in his basement.
I wish I could find the OSI 460Z board... that adds
the Intersil 6100
and some other microprocessor too to the base 3 of the C3.
That sounds wicked. I wonder how they handled the 12-bit bus of the
6100.
(If they had just jammed the CDP1802 in there too I
could have prossibly
settled on this one machine to collect...those bastards...)
Agreed... you could have all the big stars of the 1970s micros in one
cabinet. I still don't get how they managed all the different machines
in one box. The easy part is building a CPU board where you can disconnect
a particular CPU from the bus in software. The hard part is the handoff.
You'd almost need a way to preload RAM or select a ROM that was ready to
go for the next CPU you wanted to switch to. It's been so long since I've
used a C3 that I forget entirely how to boot it and switch it around. Are
there any manuals online?
-ethan
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6:15 a.m.
New subject: C3-SI
From: Ethan Dicks <erd_6502(a)yahoo.com>
pins 19-22 on the standard OSI bus = A16 - A19 for extended addressing under
the 6502 (multiuser and under software control of the PIA) and probably used
natively under the 6100...
disconnect
>
> > The C3 was kinda cool... It was wild to see a box with multiple
CPUs...
>
> C3's are cool... One, a C3-SI with a C2D dual 8" floppy system using
the
> 530 board (I think) which has the z80, 6800, and
6502 all on board.
D'oh. That's a 510 board, not a 530
That's the one! We had a family friend who put himself in serious hock
for one of those when it was new.
me too, and for a used one. ;)
I wish I could
find the OSI 460Z board... that adds the Intersil 6100
and some other microprocessor too to the base 3 of the C3.
That sounds wicked. I wonder how they handled the 12-bit bus of the
6100. (If they had
just jammed the CDP1802 in there too I could have prossibly
settled on this one machine to collect...those bastards...)
Agreed... you could have all the big stars of the 1970s micros in one
cabinet. I still don't get how they managed all the different machines
in one box. The easy part is building a CPU board where you can a particular CPU from the bus in software. The hard
part is the handoff.
You'd almost need a way to preload RAM or select a ROM that was ready to
go for the next CPU you wanted to switch to. It's been so long since I've
used a C3 that I forget entirely how to boot it and switch it around. Are
It boots under one processor (hardware selected) usually 6502 on a reset
Software processor selects happens with a PIA port . Both the 6502 and 6800
reset and drop into their monitors, the z-80 just jumps to whatever address
is preloaded at address 0 so it could be somewhat used as a slave processor
without changes. the 6800 and 6502 could too but you did have to hack in
some relocatable RAM that responded to the PIA controlled processor
shifts...
there any manuals online?
Haven't looked. Got two shelves full of dealer, software, and hardware docs
on OSI models 400 - C8P. So someday maybe when the time fairy leaves some
days under my pillow... until then, just ask.
;)
- Mike: dogas(a)bellsouth.net
7:44 a.m.
New subject: C3-SI
--- Mike <dogas(a)bellsouth.net> wrote:
From: Ethan Dicks <erd_6502(a)yahoo.com>
pins 19-22 on the standard OSI bus = A16 - A19 for extended addressing
under the 6502 (multiuser and under software control of the PIA) and
probably used natively under the 6100...
The 6100 has a 12-bit address bus (and presumably 3 bits of address
extension - EMA bits, as they are called on the PDP-8) *and* a 12-bit
data bus. _That's_ the one I was wondering about. For the address
stuff, externally, you can pretend that it has a 15-bit address bus,
and you won't have too many gyrations to perform. Where to stash the
extra 50% of data when you are sharing a box with a bunch of 8-bit
processors is the question.
I suppose you could design a buffer that performs two memory transactions,
one for D0-D7 and one for D8-D11, and write into a 64KB address space,
but personally, I'd rather design in the room for it. If the 6100
card had its own RAM, but you only permitted 8-bit I/O transfers, that
could resolve the problem, presuming you didn't have to have shared RAM
for the handoff scheme...
Dropping a 6100 onto a 16-bit bus could be easier, presuming there that
you didn't have to support 16-bit I/O. Again, limiting it to 8-bits
might be the easy way to go.
-ethan
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> The C3 was kinda cool... It was wild to see a box with multiple
> CPUs...
That sounds wicked. I wonder how they handled the 12-bit bus of the
6100.
8:28 a.m.
New subject: C3-SI
From: Ethan Dicks <erd_6502(a)yahoo.com>
The 6100 has a 12-bit address bus (and presumably 3 bits of address
extension - EMA bits, as they are called on the PDP-8) *and* a 12-bit
data bus. _That's_ the one I was wondering about. For the address
stuff, externally, you can pretend that it has a 15-bit address bus,
and you won't have too many gyrations to perform. Where to stash the
extra 50% of data when you are sharing a box with a bunch of 8-bit
processors is the question.
I suppose you could design a buffer that performs two memory transactions,
one for D0-D7 and one for D8-D11, and write into a 64KB address space,
but personally, I'd rather design in the room for it. If the 6100
card had its own RAM, but you only permitted 8-bit I/O transfers, that
could resolve the problem, presuming you didn't have to have shared RAM
for the handoff scheme...
OSI bus is 12bit address and data. Pins 13 -16 = D8 - D11, but I don't know
anythng about the EMA bits or RAM use under the 6100. I'll look through
what I have.
That
sounds wicked. I wonder how they handled the 12-bit bus of the
6100.
pins 19-22 on the standard OSI bus = A16 - A19 for extended addressing
under the 6502 (multiuser and under software control of the PIA) and
probably used natively under the 6100...
29 Jan
29 Jan
3:45 a.m.
New subject: C3-SI
--- Mike <dogas(a)bellsouth.net> wrote:
From: Ethan Dicks <erd_6502(a)yahoo.com>
>
> > > That sounds wicked. I wonder how they handled the 12-bit bus of
> > > the 6100.
> >
OSI bus is 12bit address and data. Pins 13 -16 = D8 -
D11, but I don't
know anythng about the EMA bits or RAM use under the 6100.
I caught the other correction about 12 bits data, 20 bits address... so
there's no conflict. Presumably, you would stuff extra chips to put
RAM off of D8-D11 (who'd want to have them populated if there were only
8-bit CPUs in the box), but at least the bus bits are there.
As for the EMA, that's no big deal either... the 6100 will assert them
as needed, and the memory cards would just see them as A12-A15.
-ethan
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