DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Toshiba BC-1011
| Date of introduction: | 1971 | Display technology: | Fluorescent |
| New price: | ¥115.000 (US$ 370) | Display size: | 10 + Sign |
| Size: | 10.2" x 7.2" x 3.5" | ||
| Weight: | 4 pounds 9 ounces | Serial No: | 452830 |
| Batteries: | n.a. | Date of manufacture: | mth 12 year 1970 |
| AC-Adapter: | 220V | Origin of manufacture: | Japan |
| Precision: | 14 | Integrated circuits: | Toshiba T3019, T3026, 20*SSI-ICs |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
If
we trace the timeline of electronic calculating devices we will notice the
introduction of transistor based calculators in 1964 and a quick integration of
these transistors into integrated circuits within some years.
This Toshiba BC-1011 is an interesting hybrid using two completely different technologies:
| • The first use of
LSI-ICs (Large-Scale-Integration Chips) manufactured by Toshiba • The last use of SSI-ICs (Small-Scale-Integration Chips) in an electronic calculator |
Dismantling the BC-1011 reveals a complex design using three different printed circuit boards (PCBs).
The upper half of the calculator includes the power supply and a rigid keyboard using Reed-contacts excited by small magnets attached to each key.
The Main-PCB is centered aroud two
LSI-ICs T3019 and T3026 manufactured by Toshiba and using 36-pin Ceramic
packages. The 11-digit display of the Toshiba BC-1011 calculator uses individual Vacuum Fluorescent Display (VFD)
tubes with discrete drivers.
The
bottom of the calculator houses a second, very complex PCB with an
total of 20 SSI- and MSI-ICs:
| • 9 TM4004: unknown function • 1 TM4005 - 2x2 AND-OR gates • 4 TM4103 - 4 D-Flip-Flops • 1 TM4106 - 60-bit Shift Register • 1 TM4108 - unknown function • 2 TM4306 - unknown function • 2 uPD12A - unknown function |
The predecessor Toshiba BC-1212 was introduced in 1970 and features comparable specifications. It lacks the LSI-ICs (Large-Scale-Integration Circuits) and uses instead 38 of the SSI- and MSI-ICs.
The BC-0802 introduced soon after
the BC-1011 makes already use of a single-chip calculator circuit.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, March 6, 2004. No reprints without written permission.