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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

PS-3000_BACK.jpg (234371 Byte)This small Pocket Speller is from the hardware and software very similiar to the earlier RR-1 Spell Checker introduced one year earlier.

PS-3000_PCB.jpg (460522 Byte)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.

The PS-3000 Pocket Speller is featured in the Texas Instruments Incorporated leaflet Pocket Solutions (CL-1059) dated 1990. 

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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, March 17, 2002. No reprints without written permission.