Ram Upgrade Procedure - Ricoh C217 Service Manual

7.8 RAM UPGRADE PROCEDURE

The RAM in the PCRIP-10 consists of four (4) - 1 Megabyte by 8 (or 9)
Single-Inline-Memory-Modules (SIMMs) running at 70 nanoseconds. A
SIMM consists of a very small (appr. 3/4" inch by 3 1/2" inches) printed ciruit
board (PCB) with 30 contact fingers which plug into sockets on the main
board of the PCRIP-10. Dynamic RAM memory chips which are soldered on
to this small PCB can communicate with each other through the wiring in the
board and with the main board through the 30 contact fingers. The actual
physical number of DRAM chips installed on the SIMM can be either 2 or 8
for 1 Mb x 8 (3 or 9 for 1 Mb x 9) depending on the density of the chips. (See
Figure 1.)
"1 Megabyte X 8" (or 9) describes a SIMM with 1 Megabyte usable storage
which sends data out 8 bits (or 9 bits) at a time.
"70 nanoseconds" describes how fast the memory can respond in billionths
of a second to commands from the Intel CF processor chip on the main
board of the PCRIP-10.
HOW TO UPGRADE RAM TO 16 MEGABYTES
To upgrade the PCRIP-10 to 16 Megabytes of RAM from the factory
standard, contact either a local computer dealer or an electronic component
distributor about purchasing parts with the following description:
Four (4) - 4 Megabyte X 8 (or 9) SIMMs with 30 contact fingers running at 70
nanoseconds (ns) While SIMMs of this variety are available in both 70 and
80 ns speeds, BE CERTAIN TO PURCHASE ONLY SIMMS WHICH RUN
AT 70 NS! Due to the high speed of the Intel CF processor chip, SIMMs
running at 80 nanoseconds will not work in the PCRIP-10.
NOTE: Please take appropriate precautions for preventing static
discharge throughout this procedure.
1. Turn off and disconnect all cables to the PCRIP-10.
2. Slide the metal chassis of the controller from its plastic housing.
3. Remove the 3 screws from each side and 2 screws from the backpanel
which hold the chassis lid in place.
4. Remove the chassis lid and set it aside.
C217
Figure 1 - SIMM
7-14 SM