Not I, but Mike is the leader about:
viewtopic.php?f=11&t=9325&hilit=Minimon#p104387
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I've just got my hands on a Vixen Motherboard cartridge expander which has a built-in PROM socket, but it inserts the PROM at $A000-$AFFF.
Here's what xa is.Robbie wrote:Please can you recommend a XA so that I can have a go at assembling wAx to that address. As you can guess, this is more new territory for me.
(or is XA a thing? Have I just been Really Dopey?)
Your +35K RAM expansion will also 'talk' at that address range, which will lead to data bus contention. Simultaneous operation not recommended.I've just got my hands on a Vixen Motherboard cartridge expander which has a built-in PROM socket, but it inserts the PROM at $A000-$AFFF.
@Mike, thanks for providing the link
XA will also run on Windows. (Edit: Well... maybe not. I have no idea. Definitely on a PC in a Linux VM, though)
Here's what happens - both chips will (try to) talk to the VIC-20 when BLK5 is selected, and play tug-of-war with their outputs, and the outcome depends on their technology:Robbie wrote:If the expander Eprom is mapped to $A000-$AFFF, do you think I might still be able to install RAM at block 5, and have access to RAM at $B000-$BFFF as well as wAx at $A000-$AFFF? I know you said 'not recommended', but... shall I give it a try?
You bet! It's the least I can do, what with the USPS taking its sweet time to deliver your cartridge.
Thanks, I shall give this a try.
Ha, cool! Thank you for the kind words. I am particularly happy with how the manual turned out.Robbie wrote: ↑Sat Sep 19, 2020 4:46 am The cartridge arrived today, and there's definitely something much more special about having the physical media, particularly given the quality of the manual. I'm really impressed; you must rightly be very proud. Most importantly, we sneaked it past the evil customs people at the ironically named "Mount Pleasant Depot".