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Pinout & Dimensions
Pinout & Dimensions
Here is the hand drawn pinout of the OR-4 RAM module. The RAM chip used is four HD61914 chips, this chip is used a lot by the early CASIO pocket computer & programmable calculators. This is a Hitachi part however their does not seem to be any datasheets available for it. If you know of ones existence then let me know.
Link to RAM chip info, thanks: https://www.pisi.com.pl/piotr433/hardware.htm
The dimensions of the board. Due to all the little niggly bits it is a not a case of just the PCB dimensions. They are the same as the OR-1 PCB.
KiCAD Files
KiCAD Files
These are available on GITHub.
Link Here: https://github.com/TheEPROM9/CASIO-OR-4
Main Schematic of the memory module.
Layer one of the PCB.
Layer two of the PCB.
The finished PCB in KiCAD waiting on being produced by one of the two most popular Chinese PCB manufactures.
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