HP 3000 III Series Manual page 252

MCU/Main Memory Overview
module contains Switch Sl that must be set to reflect which des-
ignated PCA number it is in the memory module (e.g., first l28K
of memory, second l28K of memory, etc.). The SMA PCA's Switch Sl
is identified in figure 6-14. As a convention only, Sl is set to
3 on the PCA installed closest to the MCL PCA, 2 on the next
closest PCA, 1 on the next PCA, and 0 on the SMA PCA installed
furthest from the MCL PCA.
I
P1
P2
SMA
30008-60003
P3
~o
...........
L
o~
\...----llll !IIDllmmUllllJI.II.l1f---uilllll..!S~1 1uJJlIIUUlIIIIf--1ll1UUluulliIillIillliJ...-----.-.,..,
J1
J3
204
Figure 6-14. SMA PCA Switch Location
6-49. MCL PCA SERVICING. The MCL PCA is a nonrepairable PCA and
must be replaced if found defecti ve • Howeve r, the MCL PCA con-
tains two switches, one of which (S2) must be set to reflect the
memory module configuration. Both switches are identified in
figure 6-15. In systems with over 5l2K words of memory, set
Switch S2 to position A on one MeL PCA and to position B on the
other MCL PCA. As a convention only, Switch S2 is set to posi-
tion A on the MCL PCA installed for lower memory (banks 0-7) and
and to position B on the
MeL
PCA installed for upper memory
(banks 8-15). Switch Sl is the ELA Manual Clear Switch and can
be used to clear the MCL PCA's Error Logging Array.
6-28