ET CPU BOARD, 562-381
The ET CPU board has four switch packages (SW1 through SW4) and three jumpers (JWl, JW2, and JW3) that
you use to select operating parameters for the ET. The board also has a single pushbutton switch (SW5) that you
use to reset the ET’s microprocessor (similar to the reset switch on the BMUX CPU board).
The ET CPU board contains a microprocessor and associated PROM and RAM (IC2 through IC9). Switch
packages SW1 and SW2 are used to select whether an IC slot is occupied by a PROM or RAM chip. Set SW1
and SW2 using the illustration above and Table H.
TABLE H
SOCKET
IF RAM CHIP
(See Note)
I
IF PROM CHIP
(See Note)
Note: SW1 and SW2 are slide switches.
IC2
IC3
IC4
IC5
IC6
IC7
ica
IC9
For SW1 switches,
UP = switch toward ICl 1
DOWN = switch toward IC22
For SW2 switches,
UP = switch toward IC16
DOWN = switch toward IC16
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