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mrehkopf / sd2snes

SD card based multi-purpose cartridge for the SNES
http://sd2snes.de
GNU General Public License v2.0
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NEC Upd77P25D and 77c25c rom progenitor #136

Closed darleiv closed 3 years ago

darleiv commented 4 years ago

ould you have the dsp files 1 2 3 4 to use directly in the official mcu nec? I have some prehistoric necs of these stored here with uv light off all are from old traffic light terminals . it would have to be the 10,240 byte bin starting the UPD77c25D file at the DATA address rom 2000h- until the end 27FFF rom instruction would go up to 17FF but i don't know how to mount these rom to make it compatible with the nec official upd77d25d or upd77c25c. are there the original rom? no google, I don't have it

mrehkopf commented 3 years ago

Hi, that's very cool to know they have been used in traffic light controls! I am not sure which would be the correct endianness to program the chips, but dumps are available here: http://www.caitsith2.com/snes/dsp/ The dump files are 8192 bytes. Instruction ROM data is at 0000-17FF, Data ROM from 1800-1FFF inside the files. You might need to pad them out if your programming tools require different addresses.