26 Jul
2019
26 Jul
'19
7:50 a.m.
On Fri, Jul 26, 2019 at 12:23 PM Jules Richardson via cctalk
<cctalk at classiccmp.org> wrote:
Hi all,
Someone on one of the Facebook vintage groups found an IBM 5160 with an MDA
display for sale in Australia, except that it's a bit odd in that the
machine had what appears to be an MDA card, the output of which is then
connected via a short external cable to the input on another card, and then
an output that card is what's actually hooked up to the monitor.
Are you sure it's MDA rather than CGA. The reason I ask is that I have a
full-length 8-bit ISA card in my collection that connects between the CGA
card and its monitor (it also provides a composite video output if you want
that) _and_ inside the machine it connects between the floppy controller and
the drives.
There's a 6502 processor on said card and it claims to provide an emulation
of the Apple ][
If yours is MDA then I wonder if it's some graphics add-on (remember
the original
MDA was text only). But most of those, like the Hercules, provided the text mode
as well and were stand-alone cards. It wasn't much extra logic to do that.
-tony