Marcel van Kervinck
Expansion 1906.zipCAD filesZip Archive - 545.76 kB - 12/28/2019 at 00:57 |
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ROMv3x.romExperimental ROM image based on ROM v3 releaserom - 128.00 kB - 03/09/2019 at 08:25 |
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Expander-schematic.pdfCircuit diagramAdobe Portable Document Format - 186.85 kB - 03/02/2019 at 13:42 |
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Gigatron I/O and RAM expander
Adding four SPI ports and up to 128K of banked RAM using nothing more than 4 TTL chips and some wizardry.