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 Display: LCD-Driver |
Memories: | 1 | ||
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.
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:
Product | ROM-size | RAM-size | Example |
Spell-Checker | 128k Bytes | 2k Bytes | RR-1 |
Data Bank | 64k Bytes | 64k Bytes | PS-6700 |
Graphing calculator | 64k Bytes | 8k Bytes | TI-81 |
Modern graphing calc | 512k Bytes | 32k Bytes | TI-83 Plus |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, Ocober 23, 2009. No reprints without written permission.