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prg_6fp.s
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Text File
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1985-11-20
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1KB
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38 lines
; Program Name: PRG_6FP.S
; Version: 1.001
; Assembly Instructions:
; Assemble in PC-relative mode and save with a PRG extension.
; Execution Instructions:
; Execute from the desktop.
; Program Function:
; Turns on keyclick sound so that the programs that turn it off can be
; tested. See programs PRG_6DP and PRG_6EP for further documentation.
mainline:
lea stack, a7 ; Point A7 to this program's stack.
execute_subroutine_in_supervisor_mode:
pea turn_key_click_on ; Push address of subroutine onto stack.
move.w #$26, -(sp) ; Function = superexec = XBIOS $26 (dec 38).
trap #14 ; XBIOS call.
addq.l #6, sp
terminate:
move.w #0, -(sp) ; Function = p_term_old = GEMDOS $0.
trap #1 ; GEMDOS call.
turn_key_click_on: ; Subroutine to be executed in supervisor
move.b #7, $484 ; mode.
rts
ds.l 24 ; Stack.
stack: ds.l 0 ; Address of stack.
program_end: ds.l 0
end