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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I could be wrong about what bits of do what, but it would be pretty easy to test this by looking at a debug log and see if the commands sent follow any kind of logical order or not.

I’m now restructuring the mappering system in Meka. Maybe a port is used, though I doubt it. The 93C46 datasheet indeed makes no mention of that but the 93C46B one does.

93c46b datasheet pdf

I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. Still need to verify if this is used by games. For the MW games they check their own header to determine the type of backup device and call the appropriate 93c46g, so without modifying the header the other backup routines are never called. Just some ideas and observations.


Just lot of tedious bit-banging. Perhaps “B” type ones do have the feature?

Never heard about the extra sound 93d46b, thought. Forum Index Development 93c46 emulation. Thu Dec 23, Fri Dec 24, 6: Sat Jun 11, 8: At any rate, I’ll post again with my findings if I make some progress.

ROM now available for developer, as well as chipset documentation from www. Wed Jun 15, Fri Dec 24, 9: The idea behind emulating this is that you wait until 9 bits have been written to 1 datwsheet bit, 2 command bits, 6 address bitsthen figure out what operation the EEPROM is supposed to carry out based on the data.

Was it required for some game to work properly?


Major’s Pro Baseball use it. 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?


I’m not totally sure the start bit is necessary. Everything will probably be cleared when I or you will implement actual emulation. Fri Jun 10, 2: World Series Baseball use the same chip too.

DataSheetDirect – catalog listing “9” no 1

Maybe it does a check for one kind of memory, and if that fails it calls the other routine? Or did you see the code in a disassembly, but never actually called? Wed Jun 15, 9: Bit 0 of is where the data is written to serially.

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. Wed Jun 15, 7: Fri Jun 10, 5: