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19 lines
658 B
Plaintext
19 lines
658 B
Plaintext
PT1 2022-11-03
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First prototype
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PT2 ????
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Hooked up eithernet port properly
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PT3 2022-12-14
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Added and hooked up connector for TRS-80 Model II
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Although worlds apart in hardware architecture, the keyboard protocol of Sirius 1 and TRS-80 Model II is surprisingly similar.
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Both uses keytronics foam and foil keyboard, which is why none of them works today.
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Both uses serial communication, with DATA and CLK from KB to computer, and BUSY/ACK from computer to KB.
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TRS-80 Model II can't seem to distinguish keydown and keyup events, it only sends data on keydown, and the data is the ASCII code.
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Sirius 1 sends on both keyup and keydown, the MSB reflects that. |