External memory on mega2560

#1 · August 22, 2026, 2:05 pm

Howdy,

Congrats for this amazing piece of software.,
I was reading the docs and didn't find how it emulates the avr mega2560 , and if it does full emulaion of external memory support . Could you point me to the right documentation .

Thanks in advanc.e,

#2 · August 23, 2026, 10:34 pm

Hi.

Sorry but avr mega2560 external memory is not implemented.

#3 · August 24, 2026, 8:34 pm

Could you tell me what would take to do it (how hard it would be and what would be the road map)?<<
I'm a little lost on the source code ..

Thanks .,

#4 · August 25, 2026, 3:43 am

Instructions reading and/or writing to RAM could not get executed in one go.
Instead they should be separated in steps adding all the external memory read/write steps with their timings, etc.
That would take a complete rewrite of AVR core.

Probably it would be faster to write a new implementation of AVR core from scratch.

#5 · August 25, 2026, 10:06 am

Thanks for the reply.

I don't have that kind of knowlege.

Anyway,. it's a great application.

Best regards,