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 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.
Everything will probably be cleared when I or you will implement actual emulation.
93c46b datasheet pdf
Never heard about the extra sound chip, thought. I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. Forum Index Development 93c46 emulation.
I’m now restructuring the mappering 93c466b in Meka. The 93C46 datasheet indeed makes no mention of that but the 93C46B one does. Was it required for some game to work properly? 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. Just some ideas and observations.
Thu Dec 23, Fri Dec 24, 9: I’m not totally sure the start bit is necessary. Just lot of tedious bit-banging. Wed Jun 15, 7: ROM now available for developer, as well as chipset documentation from www.
Sat Jun 11, 8: World Series Baseball use the same chip too. Wed Jun 15, 9: Fri Dec 24, 6: Wed Jun 15, Maybe a port is used, though I doubt it. Bit 0 of is where the data is written to serially.
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. 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?
At any rate, I’ll post again with my findings if I make some progress. Still need to verify if this is used by games.
atmel+93c46B datasheet & applicatoin notes – Datasheet Archive
Maybe it does a check for one kind of memory, and if that fails it calls the other routine? Or did you see the code in a disassembly, but never actually called? Fri Jun 10, 5: Major’s Pro Baseball use it. Fri Jun 10, 2: 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.
Perhaps “B” type ones do have the feature?