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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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? Fri Dec 24, 9: Maybe it does a check for one kind of memory, and if that fails it calls the other routine? 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.
World Series Baseball use the same chip too.
Datasheets search archive of electronic components datasheets
Everything will probably be cleared when I or you will implement actual emulation. Or did you see the code in a disassembly, but never actually called?
Wed Jun 15, Still need to verify if this is used by games. Maybe a port is used, though I doubt it. Perhaps “B” type ones do have the feature?
Major’s Pro Baseball use it. I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation.
Fri Jun 10, ratasheet Never heard about the extra sound chip, thought. 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.
Just some ideas and observations.
datwsheet Sat Jun 11, 8: Just lot of tedious bit-banging. Was it required for some game to work properly? Wed Jun 15, 9: Fri Jun 10, 5: The 93C46 datasheet indeed makes no mention of that but the 93C46B one does.
Thu Dec 23, At any rate, I’ll post again with my findings if I make some progress. Fri Dec 24, 6: I’m now restructuring the mappering system in Meka. Bit 0 of is where the data is written to serially.
atmel+93c46B datasheet & applicatoin notes – Datasheet Archive
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.
I could be wrong about what bits of do what, but it dayasheet 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. Forum Index Development 93c46 emulation. ROM now available for developer, as well as chipset documentation from www.
I’m not totally sure the start bit is necessary.