John Wolff's Web Museum

"TE8000" Desk Calculator

TE8000External.jpg (8kb) "TE8000", S/N 55105622
Functions: ASMD, K
Technology: MOS-LSI, single chip (TI TMS-0105)
Display: 8 digits, Futaba VFD tubes DG10R1
Dimensions: 140W x 210D x 80H
Weight: 0.76kg
Manufactured: Unknown, 1973.

This TE8000 is an anonymous four-function desk calculator from 1973, built with a Texas Instruments single-chip processor.

This page gives a very brief description of its internal arrangements.


TE8000Internal.jpg (26kb) TE8000 Internal View

The TE8000 calculator is housed in a rectangular plastic box finished in imitation woodgrain.

The main circuit board and the display tube board are fastened to the base with a pair of light metal brackets. A 2-pin mains connector and the power transformer are mounted at the rear of the box, with the power switch attached to the moulded top cover. The transformer secondaries are hard-wired to the circuit board.

The display uses a set of miniature eight-segment vacuum fluorescent tubes, Futaba type DG10R1. (The small eighth segment at the centre right gives a "proper" numeral 4, but the processor only drives the usual seven segments). Eight tubes are used for the numerical display, and one (at the right) for polarity and error indication.

The keyboard is built as a single module and is attached to the main board via a cable and edge connector.


TE8000Board.jpg (30kb) TE8000 Circuit Board

The TMS-0100 series single-chip processors contain all of the calculator circuitry with the exception of the power supplies and display drivers.

The rather untidy circuit board has a simple power supply at the rear and the TMS-0105 chip in the centre. The anode drivers for the nine tubes are at the left, with the eight segment drivers (seven plus decimal point) at the right. The keyboard attaches to the edge connector at the bottom.

The TMS-0105 chip used in this machine was also used in the Canon L800 calculator from 1973. The L800 is a rather more substantial machine with a Panaplex-style display and integrated-circuit drivers, but (from the user's perspective) the operation of the two machines is identical.

Original text and images Copyright © John Wolff 2005.
Page created: 4 April 2005.

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