Sometime within the next year I was thinking of trying to port this TRS-80 emulator to run on the Propeller "Demo Board" with a couple of 23k256 serial RAM chips instead of a custom parallel SRAM-equipped board. (Since the Demo Board is what I have and it doesn't have enough free I/O lines to easily interface a parallel SRAM chip.) That might count as a "RetroChallenge" entry but I *seriously* doubt I'll get that done before August. :^b
(I'm still waiting for the 23k256's to show up in the mail, and I'm only 30%-ish sure that I'll be able to write a driver/memory manager that'll manage to get enough speed out of them to make it worthwhile. The specs say I *should* be able to read and write over SPI faster than a 1.77Mhz Z-80 can over its bus, particularly if I'm clever and take advantage of the fast 32 byte paging mode and do some rudimentary caching. But so far about all I've actually done with the Propeller is made it blink lights in sequence so... I may be overly optimistic.)
(I'm still waiting for the 23k256's to show up in the mail, and I'm only 30%-ish sure that I'll be able to write a driver/memory manager that'll manage to get enough speed out of them to make it worthwhile. The specs say I *should* be able to read and write over SPI faster than a 1.77Mhz Z-80 can over its bus, particularly if I'm clever and take advantage of the fast 32 byte paging mode and do some rudimentary caching. But so far about all I've actually done with the Propeller is made it blink lights in sequence so... I may be overly optimistic.)