janost:
Hi
I hacked around abit with your emulator and patched Read/Write6502.I used a 24LC256 32Kb EEPROM for memorystorage.
It can take 1000000 writes before going bad.To be safe I mapped the first 768bytes to Arduino RAM and the rest is EEPROM space.
That should keep it relative safe even though the basic variables gets written in EEPROM when the basicprogram runs.It's just a first test any as I plan to run CBM-basic on it for Vic-20/C64 emulation.
I assume you can't put everything in EEPROM or it will be hellishly slow.
Zero page and stack can be in Arduino RAM, the program could be in EEPROM, but where are the BASIC variables stored? On most interpreted BASICs they start at the top of RAM and work down towards where the program is. That makes it hard to detect what goes in RAM and what goes in EEPROM. If the variables are in EEPROM it could slow things down a lot.
There might be a system variable you can look at to see where the end of the program is. Everything above that (ie. vars) goes in RAM, everything below (ie. program) goes in EEPROM.
(maybe)