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 93C46 datasheet indeed makes no mention of that but the 93C46B one does.
Still need to verify if this is used by games. Just some ideas and observations.
I’m now restructuring the mappering system in Meka. Or did you see the code in a disassembly, but never actually called? Forum Index Development 93c46 emulation.
93C46B Datasheet PDF
Was it required for some game to work properly? As long as 993c46b 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? Bit 0 of is where the data is written to serially. Fri Jun 10, 5: Never heard about the extra sound chip, thought.
World Series Baseball use the same chip too. I think bit 1 of the same address might distinguish between a read or write operation, but that’s pure speculation. Wed Jun 15, Just lot of tedious bit-banging.
1K Microwire Compatible Serial EEPROM
At any rate, I’ll post again with my findings if I make some progress. ROM now available for developer, as well as chipset documentation from www.
Fri Jun 10, 2: For the MW games they check their own header to daatasheet the type of backup device and call the appropriate code, so without modifying the header the other backup routines are never called. Fri Dec 24, 9: Maybe a port is used, though I doubt it. Everything will probably be cleared when I or you will implement actual emulation.
93C46B-I/SN – Microchip – PCB Footprint & Symbol Download
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 93c4b the EEPROM is supposed to carry out based on the data.
Wed Jun 15, 9: Perhaps “B” type ones do have datahseet feature? Fri Dec 24, dwtasheet 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. Maybe it does a check for one kind of memory, and if that fails it calls the other routine? Thu Dec 23, Major’s Pro Baseball use it.
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. Sat Jun 11, 8: I’m not totally sure the start bit is necessary.
Wed Jun 15, 7: