On Fri, Jul 26, 2019 at 12:23 PM Jules Richardson via cctalk <cctalk@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
