24K PRAM BOARD, 5621049
53
PROM MEMORY
SELECT
J2
Ji
PROM MEMORY RAM MEMORY
SELECT
SELECT
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A memory board containing PROM and RAM memory chips is referred to as a PRAM board. On each PRAM
board there are three blocks containing 8K of memory each (one block of RAM and two blocks of PROM). A
starting address must be selected for each block of memory.
Before setting the switches, let’s look at a PROM label. PROMS are located in IC sockets 1 through 8. The first
line of information on the label is the program number. The second line tells what card this is and what IC socket
this chip goes into. The third line is the date the chip was programmed. For example,
H901102C
cl
PROGRAM NUMBER
CARD2lC3
PRAM BOARD 2 AND THIS CHIP GOES IN IC SOCKET 3
7-8-82 THIS CHIP WAS PROGRAMMED JULY 8TH 1982
Since the memory mix between PROM and RAM is customer-sensitive, there is no standard way to set the switch
packages. However, if you perform the following procedure, the switches will be set correctly.
First, remove the PRAM boards and lay them on a static-free surface. Open all switches on switch packages Jl ,
J2, and J3. Then perform the following procedures.
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