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LISTEN

     Purpose:  Command a device on the serial bus to listen
Call Address:  $FFB1 (hex)  65457 (decimal)
Communication registers:  A
Preparatory routines:  None
Error returns:  See READST
Stack requirements:  None
Registers affected:  A

Description:

This routine will command a device on the serial bus to receive data. The accumulator must be loaded with a device number between 0 and 31 before calling the routine. LISTEN will OR the number bit by bit to convert to a listen address, then transmits this data as a command on the serial bus. The specified device will then go into listen mode, and be ready to accept information.

How to Use:

  1. Load the accumulator with the number of the device to command to LISTEN.
  2. Call this routine using the JSR instruction.

EXAMPLE:

     ;COMMAND DEVICE #8 TO LISTEN
     LDA #8
     JSR LISTEN
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