Cambridge Computers Z88 Card Case

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Z88 Card cases are memory expansion cards used with the Cambridge Computer, housing the PCB to connect to the expansion bus. Originally, a range of cards was offered. RAM cards came in 32K, 128K, 512K, and 1M sizes, while EPROM cards were available in 32K, 128K, and 256K capacities. These cards could also be used as ROM cards to add additional applications. With new Flash and RAM cards being offered, there was a need to improve the original design that relied on a mechanical press to squash the tops of four plastic pins holding the two halves of the card case together. If these pins became loose over time, the 38-pin connector did not always make contact, leading to unexplained errors. A stronger design was introduced, with the two halves being held together by four screws and nuts. The original Cambridge Computer PCBs were the right size, requiring only the two chamfered edges to be filed down by about one millimeter without compromising the circuit. Introduction and Design Notes can be found in the readme.txt file. Unfortunately, paragraph spacing does not translate correctly when downloaded to the "How I Designed This" section. A set of nuts and bolts can be obtained from Rakewell at http://www.rakewell.com/. Simply use the 'just ask' facility to inquire.