DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-81
| Date of introduction: | 1995 | Display technology: | LCD dot matrix |
| New price: | $110 | Display size: | 8 * 16 characters |
| Size: | 6.8" x 3.1" x 0.85" | ||
| Weight: | 5.6 ounces | Serial No: | 40069469 |
| Batteries: | 4*AAA + CR1620 | Date of manufacture: | mth 04 year 1996 |
| AC-Adapter: | Origin of manufacture: | Taiwan (I) | |
| Precision: | 13 | Integrated circuits: | Toshiba T84C00, SRM2264, LH5359©93, Toshiba TC14C010 Display: T6A04 |
| Memories: | 0-27 | ||
| Program steps: | 2400 Bytes | Courtesy of: | Joerg Woerner |
Texas
Instruments changed in 1995 the design of the TI-81, TI-82 and
TI-85 slightly,
please notice the position of the TI-logo and the color of the type designator.
Already one year later, with the introduction of the famous TI-83, the TI-81 was discontinued and the appearance of the
TI-82 was updated
again.
From a technical point of view is this TI-81 manufactured in
April 1996 very similar to the original TI-81 introduced in
1990:
| Component | TI-81 (Nov. 1992) | TI-81 (Apr. 1996) |
| CPU (Central Processing Unit) |
Toshiba T6A43 Application Specific Z80 CPU |
Toshiba T84C00 (Z80 CPU) |
| ASIC (Application Specific IC) |
n.a. | Toshiba TC14C010 Support Logic |
| ROM (Read Only Memory) |
Sharp LH5359©91 128k Byte ROM |
Sharp LH5359©93 128k Byte ROM |
| RAM (Random Access Memory) |
Sharp LH5160 8k Byte RAM |
Epson SRM2264 8k Byte RAM |
| Display Driver | 2*T6A39, T6A40 | T6A04 |
The driver circuit of the LC-Display was
reduced from three Quad-Flat-Pack chips of the original TI-81 to just one bare
chip mounted on a flexible piece of circuit board attached between the display
and the main PCB.
ROM-Versions:
1.1
2.0
You can check the ROM version of your TI-81 using the following key sequence and reading the number on your screen:
