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Vectronix 2
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DEVPAC31.LZH
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NOTRACE.S
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1992-08-14
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* A TSR (terminate-and-stay-resident) demo program that also has
* the useful feature of pointing the default trace exception vector
* to an RTE, as described in the MonST Chapter.
*
* This demo shows how to write a Terminate and Stay resident
* program. It does *not* try to be super-smart whereby the code
* is copied to the basepage to save memory, to preserve clarity.
* 14.8.92 updated to reflect Devpac 3 include files
include gemdos.i
include bios.i
start bra.s real_start
TSR_start
*------- here starts the code to be TSRed
bclr #7,(sp) works on 68000/10/20/30!
rte
*------- here ends the code to be TSRed
even
keep_length equ *-start
real_start
* print a message via GEMDOS - this should be before the vector patching
* in case Ctrl-C is pressed during the printing
pea hellotx(pc)
move.w #c_conws,-(sp) print string
trap #1
addq.l #6,sp
*------- any initialisation for the TSR goes here
move.l #TSR_start,-(sp)
move.w #9,-(sp) Trace vector number
move.w #setexc,-(sp) setexc
trap #13
addq.l #8,sp lose old one
*------- end initialisation
clr.w -(sp)
move.l #$100+keep_length,-(sp) $100 for basepage
move.w #p_termres,-(sp)
trap #1 that's the end
hellotx dc.b 'NOTRACE installed ',189,' HiSoft 1988',13,10,0