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HP 811 OA Service G
u
ide
F las
h EPR
O
M
s
This section is on sch em atic 3E.
These EPRO M s contain
t
he curre n t vers ion
o
f firm ware used in th e
HP 8110 Α , bu t can b e superceded by firmware stored on α Me mory
Card, whi ch ca n take
p
recede n ce at
B
oot up . Th e MPU can download
α copy
o
f th e fir mware in
t
he Mem ory Card to th e Fl ash EPRO M s .
Q2 an d Q3
p
rovide current
f
or
p
rogramming the EPROM s.
Static
R
A
M
S
Thi s section i s on sch em atic 3E .
7-1 8
Fu
nctio
n
al Desc
r
iption
Th ese RAM S contain data t h at vari es during HP 8110Α
o
perat io n.
U
2 and U 3 co ntain data th at must
b
e retained, such as config u rat ion
infor m at ion . Thi s RAM I C
i
s
b
attery-b ack ed to retain data dur ing
reset or after s wi tc h off.
U 4 an d
U
5 are not
n
or mally loaded.
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