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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
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
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 a hybrid using two different technologies:

The first use of LSI-IC's (Large-Scale-Integration Chips) manufactured by Toshiba.

The last use of SSI-IC's (Large-Scale-Integration Chips) in an electronic calculator.

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: joerg@datamath.org.