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https://codeberg.org/cryu/micro-sci-a2-controller
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Add minimal calibration procedure.
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README.md
17
README.md
@ -25,3 +25,20 @@ Firmware images can be built via the Makefile in the firmware subdirectory. The
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* 1:off 2: on - 16-sector firmware (0x0100)
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* 1:off 2: on - 16-sector firmware (0x0100)
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* 1: on 2:off - 13-sector firmware (0x0200)
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* 1: on 2:off - 13-sector firmware (0x0200)
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* 1: on 2: on - firmware "put jumpers here" splash screen (0x0300)
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* 1: on 2: on - firmware "put jumpers here" splash screen (0x0300)
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## Calibration procedure
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* set J4 to off/off ("controller test firmware")
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* connect oscilloscope to TP1
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* start machine
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* execute "call 50688"
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* execute "AAW" (and immediately hit ESC)
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* adjust R1 until waveform period is 5.4 microseconds
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* connect oscilloscope to TP2
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* execute "99W" (and immediately hit ESX)
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* adjust R2 until waveform period is 3.8 microseconds
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* card is now calibrated, power off machine and set J4 to "16-sector firmware"
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## Construction notes
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* J3 can be omitted if this controller is used with a FloppyEmu
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