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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The idea behind emulating this is that you wait until 9 bits have been written to 1 datasheft bit, 2 command bits, 6 address bitsthen figure out what operation the EEPROM is supposed to carry out based on the data. Never heard about the extra sound chip, thought.
Just lot of tedious bit-banging. Still need to verify if this is used by games. Major’s Pro Baseball use it.
ROM now available for developer, as well as chipset documentation from www. Forum Index Development 93c46 emulation. Fri Jun 10, 5: 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 datashee port is used, though I doubt it.
93c46b datasheet pdf storage
I’m now restructuring the mappering system in Meka. Or did you see the code in a disassembly, but never actually called?
Wed Jun 15, Fri Dec 24, 9: Just some ideas and observations. Wed Jun 15, 9: I’m not datasheeet sure the start bit is necessary.
atmel+93c46B datasheet & applicatoin notes – Datasheet Archive
I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. I could be wrong about what bits of eatasheet 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. Fri Jun 10, 2: Sat Jun 11, 8: World Series Baseball use the same chip too.
Was it datazheet for some game to work properly? Wed Jun 15, 7: As long as we’re on the subject of weird stuff in Game Gear datashert, doesn’t some other baseball game have an extra sound chip or banked RAM in it too? 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. Bit 0 of is where the data is written to serially. At any rate, I’ll post again with my findings if I make some progress.
Fri Dec 24, 6: Perhaps “B” type ones do have the feature? Everything will probably be cleared when I or you will implement actual emulation.
Thu Dec 23, 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.