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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Bit 0 of is where the data is written to serially. World Series Baseball use the same chip too. Wed Jun 15, 7: Forum Index Development 93c46 emulation.
Or did you see the code in a disassembly, but never actually called? I’m now restructuring the mappering system in Meka.
Everything will probably be cleared when I or you will implement actual emulation. Just lot of tedious bit-banging.
Maybe it does a check for one kind of memory, and if that fails it calls satasheet other routine? Still need to verify if this is used by games. 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? Thu Dec 23, Fri Jun 10, 2: 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.
93c46b datasheet pdf
Maybe a port is used, though I doubt it. ROM now available for developer, as well as chipset documentation from www. Wed Jun 15, Major’s Pro Datasneet use it. Fri Dec 24, 6: At any rate, I’ll post again with my findings if I make some progress.
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Fri Dec 24, 9: Sat Jun 11, 8: The 93C46 datasheet indeed makes no mention of that but the 93C46B one does. I think bit datasbeet of the same address might distinguish between a read or write operation, but that’s pure speculation.
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. I’m not datashedt sure the start bit is necessary. Fri Jun 10, 5: 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.
Was it required for some game to work properly?
93c46b datasheet pdf storage – PDF Files
Perhaps “B” type ones do have the feature? 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.