New Stuff
Author
Links
Guest book
Web-log
Bric-a-brac
Calculators
Components
Ephemera
Events
Glossary
History
Hit or Miss
Radios
Transport
Valves
Wanted
Metal Puzzles
Clocks
Calculators: Handheld: Toshiba BC-8112SL
|
|
|
| Size (approx): | 74mm
x 139mm x 19mm (max) (w,h,d) Weight 106g excluding batteries. |
| Power: | 3V DC using 2 x AA size batteries. Also accepts adapter (DC 3V, 0.3W BH-115 or BH-116) through a top side socket on the far left. |
| Case: | Slim calculator made from two pieces of matt black plastic. The top houses a black and blue printed metallic sticker with the brand and model number in its own deep recess. There is a raised and flat neutral plastic display filter that gives a bright image. The keyboard surround (which is heavily inset) is brushed aluminium with black printed text for the on/off switch label. The keys are squishy with a soft metallic click and look a lot like Casio keys with their individual escutcheons. |
| Display: | 8 digit blue VFD with a ninth digit for negative, overflow and memory indication |
| Features: | Basic four function with percentages, square root, squares, reciprocal, parenthesis, pi and four function memory. |
| Age: | 1978 |
| Manufacturer: | Toshiba Corporation. Made in Taiwan. Serial No. L11818 |
| Comments: | Nice simple calculator with a lovely blue colour theme that works well and a large display. The logic is very good with good recovery and only let down by negative square roots. The original case is soft black plastic with an open top, half-moon cut-outs on the front and back and Toshiba embossed on the front. |
| Components: | 1 x cpu: Texas TMS1945NL 7836
(date code week 36 of 1978), 28 pin DIL , 0.6" width black plastic 1 x 9 digit VFD: single tube flat face: Futaba 9-ST-08A 8K (date code October 1978) 1 x transistor: C2001 L188A 5 x diodes 5 x capacitors 5 x resistors 1 x transformer: CV038 Apollo |
| Boards: | The keyboard assembly (A1-2835 936) sits on top of the main cpu board (ZENY 560124) - and the whole lot sits lose in the case. The two are joined together by 15 strong wires. |
| Construction: | Extremely difficult to open as it is held together by very stiff sided lugs - don't bother as damage is highly likely. I started with the top lug that can be seen in the battery compartment - but it took a while to eventually pop of the front. |
| Logic comments: | The Clear /Clear Entry key (C/CE) is used to once clear an input number, the second time to completely reset the calculator |
| Input overflow is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are represented with a "-" sign in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Overflow shows the result and "C" (or "E" if negative) in the far left (ninth) digit and is recoverable using (C/CE) | |
| Divide by zero shows "C" in the far left (ninth) digit and is recoverable using (C/CE) | |
| Memory storage is indicated by an upper "n" in the far left (ninth) digit | |
| Negative square root are allowed and result in a negative number | |
| Memory overflow stores the (shifted) result | |
| No bugs found |
