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Calculators: Handheld: Toshiba BC-819
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Size (approx): |
82mm x
145mm x 25mm (w,h,d) |
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Power: |
3.0V DC using 2 x AA size batteries. It accepts an adapter (ref. BH-113 or BH-114, 3V, 0.4W) through a socket on the top side at the far left. | |
| Case: | Two piece glossy black plastic case with a brushed aluminium keyboard surround. My example is quite squeaky. There is a black and blue printed metallic sticker at the top that sits in its own recess. A flat but slightly proud neutral display filter gives a bright image. The keys are bouncy and prominent with a lose rattle. | |
| Display: | 8 digit blue VFD with a ninth digit for negative, memory and error indicators. | |
| Features: | Standard four functions, percentages, square root and four function memory | |
| Age: | 1976 | |
| Manufacturer: | Toshiba, Tokyo Shibaura Electric Company Ltd., made in Japan. Serial number H 58075 on the back sticker. | |
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Comments:
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Wide format calculator with a nice blue colour theme and bright display. However, the rattling keys and squeaky case make it feel a bit cheaper than most Toshibas. Logic OK but recovery is poor and it has the “negative zero” bug. The original case is soft smooth plastic with open top and half-moon cut-outs front and back. |
| Components: |
1 x cpu: Toshiba T3393 6F (date code June 1976) 28 pin DIL, 0.6" width 1 x VFD; 9 digit round faced single glass tube 1 x transistor 4 x diodes 5 x capacitors 16 x resistors 1 x transformer; A-092 TDK |
| Boards: | The whole assembly sits lose in the case. The keyboard assembly (A506) resting on top of the main cpu board (Toshiba 4467950001). The two are joined together with a stiff 17-way ribbon cable. |
| Construction: | Not as easy as you would first think to open. Gently prize apart the top whilst pushing in the lug that you can see inside the battery compartment. The top will eventually separate with gently prizing all round. |
| Logic comments: | (CE/C) is used once to cancel the last number entered and a second press clears the whole calculator. |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| Negative numbers are shown with a minus in the ninth (far left) digit thereby allowing full eight digit negative numbers | |
| There is automatic constant on all four functions | |
| Divide by zero shows zero and "C" in the far left (ninth) digit and is not recoverable | |
| Overflow shows the result and "C" (“E” if negative) in the far left (ninth) digit and is not recoverable | |
| Negative square roots are not allowed and show zero with “C” in the far left (ninth) digit and is not recoverable | |
| Memory store is indicated by the far left (ninth) digit decimal point | |
| This calculator suffers from the negative zero bug; try (1)(-)(2)(=) to give “-1” then (+)(1)(=) gives “-0” |
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