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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