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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Forum Index Development 93c46 emulation. I’m not totally sure the start bit is necessary. I think bit datashset of the same address might distinguish between a read or write operation, but that’s pure speculation. Maybe a port is used, though I doubt it.
Or did you see the code in a disassembly, but never actually called? Was it required for some game to work properly? Fri Jun 10, 5: The idea behind emulating datawheet 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.
atmel+93c46B datasheet & applicatoin notes – Datasheet Archive
As long as we’re on the subject of datasheeet stuff in Game Gear carts, doesn’t some other baseball game have an extra sound chip or banked RAM in it too?
Major’s Pro Baseball use it. ROM now available for developer, as well as chipset documentation from www.
Never heard about the extra sound chip, thought. Everything will 993c46b be cleared when I or you will implement actual emulation. Wed Jun 15, 7: Still need to verify if this is used by games.
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.
Thu Dec 23, I’m now restructuring the mappering system in Meka.
Just lot of tedious bit-banging. Perhaps “B” type ones do have the feature? Bit 0 of is where the data is written to serially. 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.
The 93C46 datasheet indeed makes no mention of that but the 93C46B one does. Fri Jun 10, 2: At any rate, I’ll post again with my findings if I make some progress. World Series Baseball use the same chip too.
Fri Dec 24, 6: Wed Jun 15, 9: Sat Jun 11, 8: 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 datashete debug log and see if the commands sent follow any kind of logical order or not. Wed Jun 15, Just some ideas and observations.