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; Turn on a LED wired to pin 53
org 100h ;start address
mvi c, 220 ;pinmode
mvi d, 53 ;digital pin number
mvi e, 1 ;value (0 = low, 1 = high)
push d ;save arguments
call 5 ;call BDOS
pop d ;restore arguments
mvi c, 222 ;digital write
call 5 ;call BDOS
ret ;exit to CP/M