DATAMATH CALCULATOR MUSEUM
Texas Instruments PS-3000 Pocket Speller
|Date of introduction:||1990||Display technology:||LCD dot matrix|
|New price:||Display size:||15 char|
|Size:|| 2.9" x 5.0" x
73 x 127 x 15 mm3
|Weight:||2.9 ounces, 81 grams||Serial No:||50564|
|Batteries:||2*AAA||Date of manufacture:||year 1990|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Precision:||10||Integrated circuits:|| CPU: Toshiba T9989
ROM: NEC uPD23C1024
RAM: UMC UM6116
|Program steps:||Courtesy of:||Joerg Woerner|
small Pocket Speller is from the hardware and software very similiar to the earlier RR-1
Spell Checker introduced one year earlier.
Dismantling this PS-3000 manufactured in 1990 in Taiwan reveals no surprises. The printed circuit board (PCB) sports a very clean layout and we identify the major components immediately.
The hardware resembles more or less its predecessor RR1 but is now centered around a Toshiba T9989 Application Specific CPU instead of the original 8-bit Zilog Z80 processor.
The program/word memory is labelled 23C1024, probably an OTP-ROM with a capacity of 128k Bytes. Another PS-3000 in our collection makes use of a NEC upD23C1024 chip (to be verified - this is a 64k*16 device).
The data memory of the PS-3000 is rather small with just 2k Bytes capacity. The dismantled PS-3000 makes use of a UMC UM6116 chip.
display driver of the PS-3000 Pocket Speller makes use of a traditional package
but unfortunately is soldered "face down" to the PCB and we can't
identify its manufacturer and type.
Don't miss the PS-4000 Pocket Thesaurus with almost identical hardware, using a huge program/word memory with 512k Bytes capacity.
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© Joerg Woerner, March 17, 2002. No reprints without written permission.