Purpose: Get data from the serial bus
Call address: $FFA5 (hex) 65445 (decimal)
Communication registers:A
Preparatory routines: TALK, TKSA
Error returns: See READST
Stack requirements: 13
Registers affected: A, X
Description: This is the routine to use when you want to get information from a device on the serial bus, like a disk. This routine gets a byte of data off the serial bus using full handshaking. The data is returned in the accumulator. To prepare for this routine the TALK routine must be called first to command the device on the serial bus to send data through the bus. If the input device needs a secondary command, it must be sent by using the TKSA KERNAL routine before calling this routine. Errors are returned in the status word. The READST routine is used to read the status word.
How to Use:
EXAMPLE:
;GET A BYTE FROM THE BUS JSR ACPTR STA DATA
This page has been created by Sami Rautiainen. | |
Read the small print. | Last updated December 08, 2002. |