DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Toshiba BC-0802
| Date of introduction: | 1972 | Display technology: | Fluorescent |
| New price: | Display size: | 8 | |
| Size: | 8.4" x 5.0" x 2.1" | ||
| Weight: | 1 pound 12 ounces | Serial No: | F62224 |
| Batteries: | Date of manufacture: | year 1972 | |
| AC-Adapter: | 220V | Origin of manufacture: | Japan |
| Precision: | 8 | Integrated circuits: | TMS0112 |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner |
On
a first glance the Toshiba BC-0802 looks like most other desktop calculators
like the TI-3000,
Canon L100S and the Heathkit IC-2008.
The keyboard with the [+=] key and the constant switch makes a design using the single-chip calculator technology introduced by Texas Instruments possible. A good reason to disassemble the robust machine !
| The Toshiba BC-0802 uses a green VFD (Vacuum Fluorescent Display). |  |
| The VFD is assembled with 8 single tubes, typical for Japanese desktop calculators. |  |
| Dismantling the BC-0802 is a simple job, the keyboard uses a connector to the main PCB (Printed Circuit Board). Each key uses a small magnet and a Reed contact. Made for a long life. |  |
| The main PCB consists of four areas: The VFD, the Driver electronics a power supply and the single-chip calculator circuit in the 28-pin housing. |  |
| A deeper look onto the TMS0112 gives a big surprise ! The chip was manufactured in Japan by Toshiba itself. Please notice the small J (Japan) in the TMS0112NCJ designation. |  |
The BC-0801B uses similar technics in a somewhat smaller housing, the later BC-0808B reduced weigh by more than 50%.
Don't miss the BC-1011 using more than 20 integrated circuits for similar specifications.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, May 18, 2002. No reprints without written permission.