User`s guide

BDOS FUNCTION 3: AUXILIARY INPUT
Entry Parameters:
Register C: 03H
Returned Value:
Register A: ASCII Character
The Auxiliary Input function reads the next character from the logical auxiliary
input device, AUXIN:, into register A. Control does not return to the calling program
'I the character is read.
unti
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BDOS Function Calls CP/M 3 Programmers Guide