--- Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I just received the first part of a shipment which
includes an IBM 5175 monitor. The PGA card and
possibly the AT box it resides in is on it's way.
plugged the monitor into my Vermont Microsystems
(essentially a PGA clone), and it worked like a
Have yet to plug the monitor into a VGA card and
investigate that noise (the PGA card possibly has
funky syncing scheme, like combined sync or
sync-on-green). But regardless, I'm desirous of
for these babies, technical or otherwise.
infor-mation is of the utmost importance. Can
I am reluctant to post this, because last time I
posted something similar
I got flamed, but anyway...
I have the official IBM Techref for the PGC card (I
believe that was the
official name, it was the Professional Graphics
Controller), and the
monitor. Complete with schemaitcs (which I can't
post, not having a
scanner) and programming info. I can extract useful
bits from the
programming docs if you like.
Yes, tis a pain doing a search for Professional
Graphics Adapter when others (seemingly IBM included)
chose to refer to it as the Controller. I was under
the impression it was referred to as the Options and
Adapters manual or something. I was going to have the
bloke send me the whole AT, so any s/w would be part
of the deal (I already snagged IBM Professional
Fortran 1.0 though, a true F77 implementation, written
not by M$, but Ryan-McFarland). Trouble is I'm running
out of space, so I e-mailed him last night and said
just the controller for now. When I get the thing
installed, I'll perhaps pester you for information
I assume you realise it does a hardware emulation of
the CGA card (not
including the 100*160 mode?). And that the 'better'
mode is not memory
mapped at all, rather you send commands to the card
to draw lines,
Better as in the hi-res analog color mode? The CGA
mode on the VM card can accept graphics commands in
BASIC, but at this moment I'm not able to ascertain
whether or not that means it's bit-mappable (sounds
like it though).
Going on the presumption that you mean it never takes
anything but special commands, as opposed to be
all-points-addressable, this would mean, ummm, some
sort of API is in play. Something burned into rom?
Very interesting. Not sure if I'm disappointed or not
though. I was kind of expecting a more mainstream type
of card, for which I could program some really funky
game or whatever.
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