SM-300 Service Manual
76
8. HARDWARE SETTING
8.1 Memory Expansion
The main board of TWB-09100 is for SM 300. Standard memory size on the SM 300 is 1M bytes. The standard
memory is using two SRAM, HY 628400 ALL-55 (Normal Pin). It can store approximate 1,685 PLUs with 70
characters per PLU. The memory can be expanded an additional of 1M bytes to 2M bytes, to store up to
approximate 4000 PLUs with 70 characters per PLU.
A total of two SRAM, MEM 5408 ART-55LL (Reverse Pin), is needed for the memory expansion.
Please refer to the following diagram for each SRAM location. Solder two SRAM at the bottom of SM 300 Main
Board, TWB-09100, which is locate opposite side of standard memory. After memory expansion is soldered, it
is a “must” to do a RAM check (refer to Section 4.1.2 for more information) to make sure that SRAM are
soldered properly.
This is the main board for SM 300 (TWB-09100).
The arrow indicated the RAM location.
The location of solder the additional 1 M Bytes RAM are at the other side of
these 2 RAMs IC as shown at figure below.
Figure 5. The location of the additional memory
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