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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I’m now restructuring the mappering system in Meka. World Series Baseball use the same chip too.
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 think bit 1 of datsaheet same address might distinguish between a read or write operation, but that’s pure speculation. Just lot of tedious bit-banging.
Maybe a port is used, though I doubt it. Still need to verify if this is used by games.
Everything will probably be cleared when I or you will implement actual emulation. 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.
Sat Jun 11, 8: Wed Datassheet 15, 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. 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 93c466b code, so without modifying the header the other backup routines are never called.
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? Perhaps “B” type ones do have the feature? Just some ideas and observations. 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. ROM now available for developer, as well as chipset documentation from www. I’m not totally sure the start bit is necessary.
Microchip – datasheet pdf
Never heard about the extra sound chip, thought. Forum Index Development 93c46 emulation. Wed Jun 15, 7: Fri Jun 10, 5: Fri Jun 10, 2: Thu Dec 23, Fri Dec 24, 9: Fri Dec 24, 6: Or did you see the code in a disassembly, but never actually called? At any rate, I’ll post again with my findings if I make some progress. Was it required for some game to work properly? Major’s Pro Baseball use it. Wed Jun 15, 9: