FLASH 23C1000
Summary
Adapter board to use a flash chip for the system rom in a NEC PC-8300.
PCB: https://oshpark.com/shared_projects/BEby7Yjw
BOM: https://www.digikey.com/short/z8293n
Source: https://github.com/bkw777/aDIPters
References
Mask rom datasheet
Old reference about pin-compatible parts:
Compatible flash chips that can be used on this board (at least):
- SST39SF010 https://www.digikey.com/short/z88hb8
- SST29EE010
- GLS29SF010
- If your programmer software doesn't recognize the part number, just substitute "SST29SF010"
- GLS29EE010 https://mou.sr/39tR5zu
- If your programmer software doesn't recognize the part number, just substitute "SST29EE010"
If you think you might have a difficult time soldering the TSOP chip in the pre-loaded BOM above, you can substitute the PLCC version of the same part.
Any speed and any temperature range is ok.
Any TSOP32 or PLCC32(7x9) package is ok.
ROM images
- NEC PC-8300 system rom: File:831000-438.bin
- NEC PC-8300 system rom, Y2K patched: File:831000-438-y2k.bin
Directions
Building
See FlexROM_100 to see how to do the dip legs.
Search youtube for "drag solder" to see how to solder the TSOP legs with an ordinary soldering iron.
Suggest installing parts in this order:
- Legs - The holes for the the legs are intentionally small and a fairly close fit on the legs. The legs should be installed first to avoid a problem if you accidentally get solder in some of the holes, it can be difficult to wick the holes clean enough to insert the legs after that.
- R1 - R1 is surrounded by other parts, and especially if you are using a PLCC chip, the corner of the PLCC actually extends over top of part of of R1. So it's easiest to install R1 before anything else, definitely before the PLCC chip if using that type instead of TSOP.
- TSOP or PLCC chip - Especially if you're using the 8x20mm TSOP chip, the jumper pins would be in the way and make it difficult to solder the TSOP legs.
- Jumper pins
Programming
Requirements:
- eprom programmer, such as TL-866
No matter which chip or which package type you use on the board, the board provides a pinout on the DIP legs that matches the PLCC version of the chip when the jumper is in the PROGRAM position. To program the chip, just put the board into a programmers' ZIF socket as if the whole board were a DIP chip, and tell the programmer software that it is the PLCC version of whatever chip is soldered on the board.
Running
To use the board in the PC-8300, move the jumper to the RUN position and insert into the ROM0 socket in the PC-8300, leaving the 4 pins 1, 2, 31, 32 outside the socket.