August 24, 2021 0 Comments

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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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.

Microchip – datasheet pdf

Just some ideas and observations. The idea behind emulating this is 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. 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 datashedt the other backup routines are datasheey called.


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Major’s Pro Baseball use it. Was it required for some game to work properly? Maybe a port is used, though I doubt it.

Everything will probably be cleared when I or you will implement actual emulation. Wed Jun 15, 7: Or did you see the code in a disassembly, but never actually called?

Fri Jun 10, 2: World Series Baseball use the same chip too.

I’m now restructuring the mappering system in Meka. Fri Jun 10, 5: Perhaps “B” type ones do have the feature?

Fri Dec 24, 9: Just lot of tedious bit-banging. Thu Dec 23, 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 it does a check for one kind of memory, and if that fails it calls the other routine? The 93C46 datasheet indeed makes no mention of that but the 93C46B one does. At any rate, I’ll post again with my findings if I make some progress.


Still need to verify if this is used by games.

93C46 Datasheet

Wed Jun 15, 9: Wed Jun 15, Sat Jun 11, 8: Fri Dec 24, 6: Never heard about the extra sound chip, thought. I’m not totally sure the start bit is necessary.

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? Forum Index Development 93c46 emulation. ROM now available for developer, as well as chipset documentation from www.

I think bit 1 of the same datashete might distinguish between a read or write operation, but that’s pure speculation.