Texas Instruments RR-1 Spell-Checker

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. 

We 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 Static 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: