Topic       : The ATARI Compendium
Author      : Scott Sanders / JAY Software
Version     : 1.25 (20/6/2003)
Subject     : Documentation
Nodes       : 1117
Index Size  : 32614
HCP-Version : 6
Compiled on : Atari
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View Ref-FileMfpint()
Jenabint()
Jdisint()
Xbtimer()                                                             XBIOS

Syntax

VOID Xbtimer( timer, control, data, hand )
WORD timer, control, data;
VOID (*hand)( VOID );

Function      Xbtimer() sets an interrupt on the 68901 chip.

Opcode        31 (0x1F)

Availability  All TOS versions.

Parameters    timer is a value defining which timer to set as follows:

              Name      Timer   Meaning

              XB_TIMERA   0     Timer A (DMA sound counter)

              XB_TIMERB   1     Timer B (Hblank counter)

              XB_TIMERC   2     Timer C (200Hz system clock)

              XB_TIMERD   3     Timer D (RS-232 baud rate generator)

              control is placed into the control register of the timer.
              data is placed in the data register of the timer. hand is
              a pointer to the interrupt handler which is called by the
              interrupt.

Binding       pea      hand
              move.w   data,-(sp)
              move.w   control,-(sp)
              move.w   timer,-(sp)
              move.w   #$1F,-(sp)
              trap     #14
              lea      12(sp),sp

See Also      Mfpint(), Jenabint(), Jdisint()