Ziggy the Hamster ☎️ 4ZTHHas anyone made a translator/interposer that uses a simple CPLD/FPGA to implement the #EGA / #MCGA modes that are technically doable on #PCjr / #Tandy graphics hardware? There are quite a few games that would be playable (even without a V-20 or PC-Sprint mod) which otherwise don’t run or only run in 4-color #CGA.
Shit, if you interpose the CPU and the font ROM, you could get #EGA redefinable characters as well.
Downside is you move the top of memory down to 640K and would need some way to disable the translation.
I wonder if a #GreatFET One is fast enough to do ISA bus-mastering, since that’s the only unoccupied microcontroller I have at the moment.
I think yes, but I’m not sure.
Also I guess I need to come up with some CGA test program that can be written in both BASIC and Python if I’m going to test this.