DATAMATH CALCULATOR MUSEUM
Texas Instruments SS-2000 8K CONSTANT MEMORY RAM EXPANSION Cartridge
|Date of introduction:||1983||Display technology:|
|New price:||$99.95 (MSRP 1983)||Display size:|
|Size:|| 2.1" x 2.0" x 0.55"
53 x 52 x 14 mm3
|Weight:||1.2 ounces, 32 grams||Serial No:||0048508|
|Batteries:||CR2420||Date of manufacture:||wk 02 year 1984|
|AC-Adapter:||Origin of manufacture:||USA (LTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 4.2 MByte)|
The SS-2000 8K CONSTANT MEMORY RAM EXPANSION Cartridge was developed by Texas Instruments for its CC-40 Compact Computer System and increases its power and versatility by increasing the memory capacity of the computer. The additional memory provided by the 8K RAM cartridge can be used to expand the total amount of memory available for BASIC programs and data storage, or to increase the amount of memory available for machine language programs.
When using the 8K RAM cartridge to expand the memory of the
Compact Computer 40 with a standard resident RAM of 6k Bytes, the total amount
of memory available for BASIC programs is 14k Bytes.
Dismantling this 8K CONSTANT MEMORY RAM EXPANSION Cartridge manufactured in January 1984 by Texas Instruments in their Lubbock, Texas facility, reveals a small printed circuit board (PCB) with one HN6264L RAM (Random Access Memory) manufactured by Hitachi, Japan and a CR2420 Lithium battery for its backup - hence the Texas Instruments CONSTANT MEMORY phrase.
The HM6264LP uses a CMOS process resulting in a very low power standby consumption of 0.01 mW and features a capacity of 8k Bytes with an access time of just 120 ns. The nominal battery capacity of the CR2420 Lithium battery is 135 mAh, the typical standby current of the RAM about 2 µA for an expected backup time of more than 5 years.
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© Joerg Woerner, October 20, 2019. No reprints without written permission.