93C46B DATASHEET PDF
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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For the MW games they check their own header to determine the type datawheet backup device and call the appropriate code, so without modifying the header the other backup routines are never called.
Bit 0 of is where the data is written to serially. Forum Index Development 93c46 emulation.
I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. Thu Dec 23, Fri Dec 24, 9: 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.
Sat Jun 11, 8: Maybe a port is used, though I doubt it.
Just lot of tedious bit-banging. Major’s Pro Baseball use it. Wed Jun 15, 9: 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?
93C46B Datasheet(PDF) – Microchip Technology
Quote 1 At the end of a READ 93d46b last cyclethe current word address is incremented so that next cycles would actually read the next word in memory array. Or did you see the code in a disassembly, but never datasheett called? Fri Jun 10, 2: World Series Baseball use the same chip too. Perhaps “B” type ones do have the feature?
Maybe it does a check for one kind of memory, and if that fails it calls the other routine?
93c46b datasheet pdf storage – PDF Files
Wed Jun 15, Was it required for some game to work properly? ROM now available for developer, as well as chipset documentation from www. At any rate, I’ll post again with my findings if I make some progress. Never heard about the extra sound chip, thought. Fri Jun 10, 5: Still need to verify if this is used by 93c46. Wed Jun 15, 7: Fri Dec 24, 6: The 93C46 datasheet indeed makes no mention of that but the 93C46B one does.
93C46B Datasheet PDF
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’m not totally sure the datashheet bit is necessary. I’m now restructuring the mappering system in Meka.
Everything will probably be cleared when I or you will implement actual emulation. Just some ideas and observations.