23 Aug
2018
23 Aug
'18
8:31 p.m.
I'm not that lucky! But yes, an early card with the light pen connector
should work.
The card I used for the demo is a somewhat later revision. I added rework
wires to match the schematic in the technical reference manual of the
earlier revision.
With either an early MDA card or a modded card, if you fire up DOS 5.0 and
have QBASIC, you'll find that the COLOR statement... just works! It's quite
strange.
On Thu, Aug 23, 2018 at 8:24 PM Fred Cisin via cctalk <cctalk at classiccmp.org>
wrote:
On Thu, 23 Aug 2018, Ali via cctalk wrote:
Which revision MDA is this? I have an original
NEC Multisync and I have
a tone of MDA cards including one in one the first 5000 IBM 5150s
produced. I would love to get color out of it just for the sake of doing
it. Do you still have your demo programs?
Do any of yours have the 6 pin Berg connector near the top of the mounting
plate? Some did. On CGA, that connector is for light pen.
Supposedly some early MDAs had pins 3,4,5 connected (not connected in
later ones). That MIGHT be the same ones as have the light-pen?
connector.
https://www.seasip.info/VintagePC/mda.html#cmda
http://www.minuszerodegrees.net/5150/early/5150_early.htm