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CASIO OR-1 RAM Pack

Schematic & Pinout

Here is the hand drawn schematic & the pinout of the OR-1 RAM module. The main chip & only component used in it other than the PCB & case. The RAM chip used is a HD61914, 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.

KiCAD Files

These are available on GITHub.
Link Here: https://github.com/TheEPROM9/CASIO-OR-1

Main Schematic of the memory module.

The PCB layout. The INT & GND are both connected to the same pin as the RAM chip is active low. Also the original board had a guard trace, I replicated that in my design.

The finished PCB in KiCAD waiting on being produced by one of the two most popular Chinese PCB manufactures.

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