Additional BDOS calls for Arduino / Teensy.

HostOS is available for all platforms - see cpm.h

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BDOS function 220 (0xDC) - PinMode:

 LD C, 220
 LD D, pin_number
 LD E, mode (0 = INPUT, 1 = OUTPUT, 2 = INPUT_PULLUP)
 CALL 5

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BDOS function 221 (0xDD) - DigitalRead:

 LD C, 221
 LD D, pin_number
 CALL 5

Returns result in A (0 = LOW, 1 = HIGH).

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BDOS function 222 (0xDE) - DigitalWrite:

 LD C, 222
 LD D, pin_number
 LD E, value (0 = LOW, 1 = HIGH)
 CALL 5

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BDOS function 223 (0xDF) - AnalogRead:

 LD C, 223
 LD D, pin_number
 CALL 5

Returns result in HL (0 - 1023).

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BDOS function 224 (0xE0) - AnalogWrite:

 LD C, 224
 LD D, pin_number
 LD E, value (0-255)
 CALL 5

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BDOS function 250 (0xFA) - HostOS:

 LD C, 250
 CALL 5

Returns result in HL (1 = Arduino, 4 = Teensy).