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Theory
of
Operation
-
494A/494Ap
Servlce,
Vol.
1
DTA PFESENT
DT
REOUEST
ilA
GRANT
feoc
SWP CATE
TMER
sNO
oPrg
sRo
SER RgO
PWR FAIL
lililililll
NEAR PANEL
GP|a
SIVITCH
(P
VERStOfl
ONLYI
-__ ,-7
Llllllull,l
ITISTRUTE'{T
oATA
8US
INSTRUTIEilT
AOOfi€SS
aus
TIMEN SRO
02
CLocK
I/O
SPACE MEMORY MAP
+
EPnoti
SYSTET
fiA'U
I
I
I
?
+-
--
7E@
+--+
+---
Figure
7-31.
UO
addr€ss
space.