Some people might be interested in these, so here goes.
I found this multicart at a flea market. Aside from an unusually high number of real games (70-ish) it also has a 60-72 pin converter soldered onto the 60-pin cartridge. The converter appears to be of pirate manufacture, although it does have a genuine lockout chip.
Next up is Mike Tyson's Punch-Out for the Playchoice 10. Unlike the NES/Fami versions, this one has battery-backed SRAM for saving high scores. The SRAM chip is above U1, which is the PRG EPROM. Interestingly, this game has a PRG EPROM and a CHR mask ROM (U3). Presumably, this is because the PRG code was changed to accomodate the code to save the high scores, but the sprite data wasn't modified, so an ordinary CHR ROM from the console version was used to save money. The chip above the battery is a 74HC139N, a dual 1-of-4 demultiplexer. Both sets of selects and outputs are used, although some output pins don't seem to be connected to anything.
Unfortunately, this particular board suffers from problems including graphical glitches and frequent crashes. This apparent combination of PRG and CHR errors leads me to suspect the mapper, but it's really just a guess.
I found this multicart at a flea market. Aside from an unusually high number of real games (70-ish) it also has a 60-72 pin converter soldered onto the 60-pin cartridge. The converter appears to be of pirate manufacture, although it does have a genuine lockout chip.
Next up is Mike Tyson's Punch-Out for the Playchoice 10. Unlike the NES/Fami versions, this one has battery-backed SRAM for saving high scores. The SRAM chip is above U1, which is the PRG EPROM. Interestingly, this game has a PRG EPROM and a CHR mask ROM (U3). Presumably, this is because the PRG code was changed to accomodate the code to save the high scores, but the sprite data wasn't modified, so an ordinary CHR ROM from the console version was used to save money. The chip above the battery is a 74HC139N, a dual 1-of-4 demultiplexer. Both sets of selects and outputs are used, although some output pins don't seem to be connected to anything.
Unfortunately, this particular board suffers from problems including graphical glitches and frequent crashes. This apparent combination of PRG and CHR errors leads me to suspect the mapper, but it's really just a guess.
