DATAMATH CALCULATOR MUSEUM
Texas Instruments RR-1 Spell-Checker
|Date of introduction:||1989||Display technology:||LCD dot matrix|
|New price:||Display size:||15 char|
|Size:||3.2" x 7.0" x 0.7"|
|Weight:||5.5 ounces||Serial No:||9040018311|
|Batteries:||4*AAA||Date of manufacture:||mth 04 year 1989|
|AC-Adapter:||Origin of manufacture:||Taiwan (I)|
|Precision:||10||Integrated circuits:|| CPU: Toshiba T84C00A
ROM: Toshiba TC531000
RAM: Sanyo LC3518
|Program steps:||Courtesy of:||Joerg Woerner|
Texas Instruments introduced already in 1989 this powerful Spell-Checker RR-1. The later RR-2 added a Thesaurus to the Spell-Checker function.
A much smaller product followed within 1 year, don't miss the PS-3000.
What is a Spell-Checker? Type in a word and the Spell-Checker compares it immediately with roughly 97,000 words of its memory.
noticed some minor changes of the key printing during production time. Don;t
miss the second edition of the RR-1 and focus on the
printing of the [ON - OFF] key legend.
Dismantling this early Spell-Checker RR-1 reveals a rather complex printed circuit board (PCB) centered around a Z80 compatible Toshiba T84C00A microprocessor, a Toshiba TC531000 OTP-ROM with 128k Bytes capacity and a small RAM Sanyo LC3518 with 2k Bytes capacity. The single-chip display driver was assembled in reverse direction and hides its type. We assume that the chip was manufactured by Toshiba.
The TMPZ84C00A is an 8-bit microprocessor manufactured in Toshiba's low-power C-MOS Silicon gate technology featuring a power consumption of only 15 mA while operating at 6 MHz. The above sketched architecture was used in a lot of different products with just another balance of RAM and ROM capacity:
|Spell-Checker||128k Byte||2k Byte||RR-1|
|Data Bank||64k Byte||64k Byte||PS-6700|
|Graphing calculator||64k Byte||8k Byte||TI-81|
|Modern graphing calc||512k Byte||32k Byte||TI-83 Plus|
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, Ocober 23, 2009. No reprints without written permission.