APPENDIX K
hdv
_
rw
1142-1145 ($476-$479)
T h e v e cto r to th e ro u tin e to u se w h en T O S fu nctio n s w ish to rea d o r w rite
to th e h ard disk. T his ro u tin e is in sta lled w h e n th e h ard disk is in itialized ,
a n d sh ou ld follo w th e callin g se q u en ce of th e n o rm al B IO S R w a b s () fu n c
tio n. A v a lu e o f 0 is s to re d h ere if n o h a rd d isk is atta ch ed .
hdv
__
boot
1146-1149 ($47A-$47D)
V e cto r to th e ro utin e u sed to b o ot from th e h ard d isk . A v alu e o f 0 is
sto re d h ere if n o h a rd disk is a ttach e d .
hdv
__
mediach
1150-1153 ($47E-$481)
T h e v e cto r to th e ro u tin e to u se w h en th e M e d ia ch b () ro u tin e re q u es ts in
fo rm atio n a b o u t a h ard d isk 's m e dia ch a n g e s tatu s. T his ro u tin e is in stalled
w h e n th e h ard disk is in itialized , a n d sh o u ld follow th e calling se q u e n ce o f
th e n o rm a l BIO S M e d i a c h () fu nctio n. A v a lu e o f 0 is s to red h ere if n o
h ard d isk is atta ch e d .
__
cmdload
1154-1155 ($482-$483)
W h en th is lo cation co n ta in s a n o n ze ro va lu e , th e sy ste m a tte m p ts to load
a n d ex e cu te a p ro g ra m ca lled C O M M A N D .P R G from th e b o ot de v ice. T h is
m a ke s it po ssib le to lo ad a n ap p licatio n o th e r th an th e G E M D esk top a t
b o o t tim e. S tore a n o n z ero va lu e h ere from th e disk 's b oo t co d e .
conterm
1156 ($484)
T his b y te co n ta in s a n u m b er of flag b its th at co ntro l va rio u s as p ec ts o f th e
co n sole d ev ice 's fu n ction in g:
B it S e t A ctio n
0 E nab le k ey -click so u n d w h e n k ey is p res se d
1 E n ab le k e y re p ea t
2 E n ab le bell so u n d w h e n a C T R L -G ch ara cte r (A SC II 7 ) is w ritte n
to C O N :
3 C a u se th e B IO S B c o n i n () fu n ction to re tu rn in fo rm atio n a b ou t
th e sh ift k ey sta tu s fro m k bshift in bits 2 4 -3 1
reserved
1157 ($485)
398
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