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
0.60" 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 Display: LCD-Driver |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
This
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.
The
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 17, 2002. No reprints without written permission.