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Cambridge Computer patents related to Z88 :

View file
namepatent z80 clock.pdf
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View file
namepatent slot connector.pdf
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View file
namepatent dram.pdf
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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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View of the full internal slot with a 512K Flash Eprom on the left (Am29F040) and a 512K SRAM (HM628512) on the right.

 

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Component side tracks to be cut near the ROM socket which has to be added after unsoldering of the old ROM.

 

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