Assembly language subroutines for the 6809

Assembly language subroutines for the 6809

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Leventhal and Cordes provide clear, concise and immediately usable subroutines for users of Apple II, IIC, and IICG computers.4. OUTST sets the Carry flag from the Character Available flag (TRNDF). 5. INIT clears the software flags, resets the ACIA (a master reset, since the device has no reset input), and determines the ACIAa#39;s operating mode by placing the appropriate value in its control register. INIT starts the ACIA with input interrupts enabled and output interrupts disabled. ... IOSRVC determines whether the interrupt was an input interrupt (bit 0 of the ACIA status register = 1), an output interrupt (bit 1 of theanbsp;...


Title:Assembly language subroutines for the 6809
Author: Lance A. Leventhal, S. Cordes
Publisher:McGraw-Hill Book Co Ltd - 1989-01-01
ISBN-13:

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