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Issue 4 board modification to use a full internal slot with 512K static RAM and a 512K 5V Flash Eprom. An internal Flash Eprom allows OS update with ROMUpdate Utility.

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Flash Eprom is on the left (Am29F040) and SRAM (HM628512) on the right.

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Component side tracks to be cut near the ROM socket.

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Tracks to be cut and wires to be added on the PCB side.