While trying to dump a keytronic 8048 microcontroler I tested my teensy 804x dumper with another similar 8048. I now have a Videopac G7400 French 1kb image that seems good (found string "quel jeu ?" inside). Was this rom already dumped and tested in MESS ? (it's different from G7400.bin and Jopac.bin found elsewhere).
my keytronic 8048 seems unfortunatly dead (does not go to read mode...)
Remember to use the exact correct type of 8048 when dumping as 8748, DO NOT dump most 8048 chips as '8748', instead use '87c49' or similar, since eprom 8748 required a very high voltage for read mode which may blow up many 8048 chips, or permanently protect them by burning the /EA pin out!
plain 8748 uses 18 or 21VDC on /EA for read mode, while 87c49 uses 12v and seems quite a bit safer in that regard, i.e. dumping 8048 as 87c49. using a current-limiting resistor is also probably not a bad idea.