Just came across Vince Briel's version of markadev's Apple II VGA card and I'm wondering if it might allow me to add Apple II video text and graphic modes with VGA output and run Apple II software on a homebrew 6502 SBC?

Quoting from markadev's github page;

The card connects to the 16 address lines, 8 data lines, the DEVSEL strobe (16 slot dependent addresses), the R/W line, and the PHI0 clock line. I'm wondering if I could map the 4K $CXXX block for I/O on an SBC, provide a DEVSEL strobe, and read or write to Apple 'soft switch' addresses in order to implement Apple II video using Text1, Text2, Hires1, and Hires2 areas of main memory? What do you think? Could this work?

TIA... Cheerful regards, Mike

It might well work... I think modelling reads is much harder than modelling writes, because there's a hard deadline for responding with appropriate data. But then, for the softswitches, that's perhaps no great challenge. It's a great advantage with displays, that the information flow is one-way. (In this case, the host still has the video RAM and can read it back in the usual way.)