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