but didn't bother to read
taken a look again and found that it works
download his dumprom.exe
follow the instruction and try it on the 8390 rom you downloaded earlier
dumprom FACHSR42n.bin 0x81a00000 -d dump > info.txt
I could extract the files from the rom
though only 26.9MB out of a 32MB rom image...
And his rapi tools works on 8390 too
reading the readme file...
It seems that you could even use his pmemdump.exe to dump the rom
still haven't figured it out yet