Apple-2-HW/micro-sci-a2-controller
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Add minimal calibration procedure.

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Christopher RYU 2023-07-27 14:17:21 +09:00
parent eb26141a55
commit 8143c80334
1 changed files with 17 additions and 0 deletions
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README.md
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@ -25,3 +25,20 @@ Firmware images can be built via the Makefile in the firmware subdirectory. The
* 1:off 2: on - 16-sector firmware (0x0100)
* 1: on 2:off - 13-sector firmware (0x0200)
* 1: on 2: on - firmware "put jumpers here" splash screen (0x0300)
## Calibration procedure
* set J4 to off/off ("controller test firmware")
* connect oscilloscope to TP1
* start machine
* execute "call 50688"
* execute "AAW" (and immediately hit ESC)
* adjust R1 until waveform period is 5.4 microseconds
* connect oscilloscope to TP2
* execute "99W" (and immediately hit ESX)
* adjust R2 until waveform period is 3.8 microseconds
* card is now calibrated, power off machine and set J4 to "16-sector firmware"
## Construction notes
* J3 can be omitted if this controller is used with a FloppyEmu