ST Memory Map
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dskbufp
1 2 2 2 -1 2 2 5 ( $ 4 C 6 - $ 4 C 9 )
P o in te r to a I K disk b u ffe r. T h is b u ffer is also u se d b y so m e g ra p h ics o p er
atio n s, a n d sh ou ld n o t b e u se d by in terru p t ro u tin es.
utopath
1 2 2 6 - 1 2 2 9 ( $ 4 C A - $ 4 C D )
P o in te r to a u to e xe c p a th (o r n u ll).
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vbl
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list
1 2 3 0 - 1 2 6 1 ( $ 4 C E - $ 4 E D )
T his are a is u sed fo r th e d efau lt d efe rred V BI tab le, w h ic h is p o in ted to b y
vb lq u eu e (1 11 0, $ 45 6).
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prt
_
cnt
1 2 6 2 - 1 2 6 3 ( $ 4 E E - $ 4 E F )
T his flag is u sed to let th e s y ste m k n o w w h e n to sta rt a scre e n d u m p , a n d
w h en to a b o rt it. It's in itially se t to - 1 , a n d in crem en ted w h e n th e A lter-
n ate-H e lp k ey is p re ss ed . T h e scr e e n d u m p c o d e sta rts se n d in g in fo rm a
tion to th e p rin te r w h e n it se es a va lu e of z ero h ere , a n d ab orts th e s cree n
p rin t w h en it se es a n o n z ero v alu e.
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prtabt
1 2 6 4 -1 2 6 5 ( $ 4 F 0 - $ 4 F 1 )
F lag to a b o rt p rin t o p e ra tio n d u e to tim e-o u t.
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sysbase
1 2 6 6 - 1 2 6 9 ($ 4 F 2 - $ 4 F 5 )
P o in ter to th e sta rt o f th e T O S R O M s. T his v alu e is n e ed ed b ec au se th ere
is n o g u a ra n te e th at th e c u rre n t sta rtin g ad d re ss will n o t ch a n g e (fo r in
stan ce , th e R O M s m ig h t g e t b igg er).
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shell
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p
1 2 7 0 - 1 2 7 3 ($ 4 F 6 - $ 4 F 9 )
P o in ter to she ll-sp ecific co n te x t.
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