The Microchip Technology Inc. 93C46B is a 1K-bit, low-voltage serial Electrically Erasable PROM. The device memory is configured as 64 x 16 bits. Advanced. 93C46B datasheet, 93C46B circuit, 93C46B data sheet: MICROCHIP – 1K Microwire Compatible Serial EEPROM,alldatasheet, datasheet, Datasheet search. 93C46B datasheet, 93C46B circuit, 93C46B data sheet: MICROCHIP – 1K V Microwire Serial EEPROM,alldatasheet, datasheet, Datasheet search site for.

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Maybe a port is used, though I doubt it. Still need to verify if this is used by games.

DataSheetDirect – catalog listing “9” no 1

Forum Index Development 93c46 emulation. Wed Jun 15, 7: As long as we’re on the subject of weird stuff in Game Gear carts, doesn’t some other baseball game have an extra sound chip or banked RAM in it too? Never heard about the extra sound chip, thought. I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation.


Maybe it does a check for one kind of memory, and if that fails it calls the other routine? Perhaps “B” type ones do have the feature? Fri Jun 10, 5: I’m now restructuring the mappering system in Meka. Major’s Pro Baseball use it.

ROM now available for developer, as well as chipset documentation from www. Thu Dec 23, The idea behind emulating this is that you wait until 9 bits have been written to 1 93c46 bit, 2 command bits, 6 address bitsthen figure out what operation the EEPROM is supposed to carry out based on the data.


World Series Baseball use the same chip too. Wed Jun 15, At any rate, I’ll post again with my findings if I make some progress.

Was it required for some game to work properly? Everything will probably be cleared when I or 93d46b will implement actual emulation. The 93C46 datasheet indeed makes no mention of that but the 93C46B one does.

Microchip – datasheet pdf

Fri Dec 24, 6: Fri Jun 10, 2: Quote 1 At the end of a READ sequence last cyclethe current word address is incremented so that next cycles would actually read the next word in memory array.


Or did you see the code in a disassembly, but never actually called? For the MW games they check their own header to determine the type of backup device and call the appropriate code, so without modifying the header the other backup routines are never called. Just some ideas and observations.

Bit 0 of is where the data is written to serially.

Just lot of tedious bit-banging. Wed Jun 15, 9: I’m not totally sure the start bit is necessary. I could be wrong about what bits of do what, but it would be pretty easy to 93c4b6 this by looking at a debug log and see if the commands sent follow any kind of logical order or not.

Fri Dec 24, 9: Sat Jun 11, 8: