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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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? Fri Dec 24, 6: I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation.

Perhaps “B” type ones do have the feature? Maybe it does a check for one kind of datasbeet, and if that fails it calls the other routine?

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. Maybe a port is used, though I doubt it. The datashret behind emulating this datsaheet that you wait until 9 bits have been written to 1 start bit, 2 command bits, 6 address bitsthen figure out what operation the EEPROM is supposed to carry out based on the data.


Bit 0 of is where the data is written to serially. Forum Index Development 93c46 emulation.

93c46b datasheet pdf storage – PDF Files

The 93C46 datasheet indeed makes no mention of that but the 93C46B one datashert. Fri Jun 10, 2: I’m not totally sure the start bit is necessary.

Fri Dec 24, 9: Or did you see the code in a disassembly, but never actually called? I’m now restructuring the mappering system in Meka. Thu Dec 23, Major’s Pro Baseball use it.

Wed Jun 15, Just lot of tedious bit-banging. Never heard about the extra sound chip, thought. At any rate, I’ll post fatasheet with my findings if I make some progress.

93C46B – Memory – Memory

Wed Jun 15, 7: 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. 9c46b will probably be cleared when I or you will implement actual emulation.


Fri Jun 10, 5: Sat Jun 11, 8: World Series Baseball use the same chip too. Still need to verify if this is used by games. Wed Jun 15, 9: Was it required for some game to work properly?

93c46b datasheet pdf

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. ROM now available for developer, as well as chipset documentation 9c46b www. Just some ideas and observations.

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