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T h e f o llo w in g s y s t e m v a r i a b l e l o c a t i o n s a r e t h e o n l y o n e s t h a t A t a r i g u a r
a n t e e s n o t t o c h a n g e b e t w e e n T O S v e r s i o n s . A n y u n d o c u m e n t e d v a r i a b l e s ,
R O M r o u t i n e s o r e x c e p t i o n v e c t o r s a r e a l m o s t c e r t a i n t o c h a n g e , a n d
s h o u ld n o t b e r e lie d u p o n .
1 0 5 6 - 1 0 5 9
If th is l o c a t i o n c o n t a i n s t h e m a g i c n u m b e r $ 7 5 2 0 1 9 F 3 , a n d t h e m a g i c n u m
b e r in m e m v a l 2 ( 1 0 8 2 , $ 4 3 A ) is a l s o c o r r e c t , t h e n t h e c o l d s t a r t w a s s u c c e s s
f u l, a n d t h e m e m o r y c o n f i g u r a t i o n in m e m c n t l r ( b e lo w ) is c o r r e c t .
1 0 6 0 - 1 0 6 1
T h e s e c o n d n y b b le o f th is w o r d c o n t a i n s t h e c o n f i g u r a t i o n v a l u e f o r t h e
m e m o r y c o n t r o l l e r . S o m e p o s s i b l e v a l u e s in c l u d e :
V a l u e o f
N y b b l e
M e m o r y C o n f i g u r a t i o n
0
1 2 8 K ( o r 2 5 6 K , 2 b a n k s )
4
5 1 2 K
5
1 M b ( 2 b a n k s )
1 0 6 2 - 1 0 6 5
If th is l o c a t i o n c o n t a i n s t h e m a g i c n u m b e r $ 3 1 4 1 5 9 2 6 , t h e n o n s y s t e m r e
s e t , e x e c u t i o n w ill b e d i r e c t e d t h r o u g h r e s v e c t o r b e l o w .
1 0 6 6 - 1 0 6 9
T h e s y s t e m w ill j u m p t h r o u g h t h i s v e c t o r v e r y e a r l y in t h e r e s e t p r o c e s s if
r e s v a l i d is s e t t o it s m a g i c n u m b e r .
1 0 7 0 - 1 0 7 3
T h is l o c a t i o n p o i n t t o t h e p h y s i c a l t o p o f R A M , t h e f ir s t u n u s a b l e b y t e a t
t h e h i g h e n d o f t h e m e m o r y s p a c e (f o r i n s t a n c e , $ 8 0 0 0 0 f o r a 5 1 2 K m a
c h i n e ) .
ST Memory Map
System Variables
memvalid
memcntlr
resvalid
resvector
phystop
( $ 4 2 0 - $ 4 2 3 )
( $ 4 2 4 - $ 4 2 5 )
( $ 4 2 6 - $ 4 2 9 )
( $ 4 2 A - $ 4 2 D )
( $ 4 2 E - $ 4 3 1 )
393
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