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Published 20 hours ago • verified publisher icon trcwm

original roms?

Open rampa069 opened this issue 4 years ago • 6 comments

Hi. i am playing with your syntetizer and was wondering if is possible to change the rom to the original chip.

is there any chance?

rampa069 avatar Jan 17 '21 01:01 rampa069

Hi @rampa069, I'm not sure I understand your question correctly. Do you want to replace the internal ROM in the FPGA with new content or use an external original SP0256 ROM with the FPGA?

Regards, Niels.

trcwm avatar Jan 19 '21 20:01 trcwm

I want to use original SP0236 roms. I have your implementation working in a Oddysey2/Videopac fpga implementation and wat to use the original roms from the real oddysey hardware. is this possible?

Thanks in advance.

rampa069 avatar Jan 19 '21 22:01 rampa069

Yes, that should be possible. If you dump the SP0236, name it 'ctrlrom.hex' and use genctrlrom.py to generate a new rom for the FPGA, there is a chance it could work.

trcwm avatar Jan 20 '21 00:01 trcwm

dont seem the same format. your rom seem to be 4k (converting the hex to binary) the "original" rom from the oddysey2 is 2K in size (sp0256b-019.bin) and 16k the extended (spr128-003.bin). the python program fails with this roms.

rampa069 avatar Jan 22 '21 23:01 rampa069

Ah, the Python script and the Verilog code will need adapting to different ROM sizes. I can investigate when I have some free time, but I don't expect that will happen very soon.

trcwm avatar Jan 24 '21 15:01 trcwm

thank you very much. i'll have a look to the python core to try to figure how to change.

rampa069 avatar Jan 25 '21 19:01 rampa069