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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Fri Dec 24, 9: Major’s Pro Baseball use it. Perhaps “B” type ones do have the feature?
Sat Jun 11, 8: I’m now restructuring the mappering system in Meka. Wed Jun 15, 9: Fri Jun 10, 2: The 93C46 datasheet indeed makes no mention of that but the 93C46B one does. 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 datasneet in memory array. 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.
Maybe it does a check for one kind of memory, and if that fails it calls the other routine? At any rate, I’ll post again with my findings if I make some progress. Fri Dec 24, 6: Forum Index Development 93c46 emulation. ROM now available for developer, as well as chipset documentation from www. Just lot of tedious bit-banging. 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.
As long as we’re on the subject of weird stuff in Game Gear carts, doesn’t some other baseball 934c6b have an extra sound chip or banked RAM in it too? Bit 0 of is where the data is written to serially.
Microchip – datasheet pdf
Wed Jun 15, 7: Thu Dec 23, I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. Fri Jun 10, 5: Just some ideas and observations. Maybe a port is used, though I doubt it.
Still need to verify if this is used by 93d46b. Never heard about the extra sound chip, thought. Everything will probably be cleared when I or you will implement actual emulation.
93C46B Datasheet PDF
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 datzsheet of logical order or not.
Wed Jun 15, I’m not totally sure the start bit is necessary.
Or did you see the code in a disassembly, but never actually called? World Series Baseball use the same chip too.
Was it required for some game to work properly?