DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1971||Display technology:||Fluorescent|
|New price:||¥115.000 (US$ 370)||Display size:||10|
|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-IC's|
|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 a hybrid using two different technologies:
Dismantling the BC-1011 reveals three different printed circuit boards (PCB's):
|The upper half of the calculator with the power supply and a rigid keyboard using Reed-contacts excited by small magnets attached to each key.|
|The main PCB with the two LSI-IC's manufactured by Toshiba and the 10-digit VF-Display.|
|The second PCB with an
overall of 20 SSI- and MSI-IC's:
||9 TM4004: unknown function||1 TM4005: 2 AND-OR gates||4 TM4103: 4 D-Flip-Flops||1 TM 4106: 60-bit Shift register||1 TM 4108: unknown function||2 TM4306: unknown function||2 uPD12A: unknown function|
The predecessor Toshiba BC-1212 was introduces in 1970 and gives comparable specifications. It lacks the LSI-IC's (Large-Scale-Integration Chips) and uses instead 38 of the SSI- and MSI-IC's.
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: email@example.com.
© Joerg Woerner, March 6, 2004. No reprints without written permission.