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LEDG0 - disk (SD) activity (for real!)
LEDG1 - disk selected
LEDG2 - Ethernet selected
LEDG3 - CAS: relay (OUT 58,32)
LEDG4 - CAS: data out (OUT 58,64)
LEDG5 - turbo 3 (25 MHz)
LEDG6 - turbo 2 (12, 25 MHz)
LEDG7 - turbo 1 (6, 12, 25 MHz)
LEDR9-0 just show the status of SW9-0
KEY0 - Reveal text
KEY1 - Video mode test
KEY2 - CPU reset
KEY3 - Turbo mode
SW0 - SD card inserted
SW1 - SD card write protect
SW2 - physical serial port is V.24 not printer
SW3 - suppress blue (use for green or amber screen)
SW4 - suppress red (use for green screen)
SW5 - monitor calibration test pattern
SW6 - suppress blink
SW7 - reverse video
SW8 - no turbo (3 MHz default)
SW9 - 40 column default
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