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Calculators: Handheld: Brinlock 806MD
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Size (approx): |
84mm
x 133mm x 19mm(max) (w x h x d) Weight 90g excluding batteries. |
| Power: | 3.0V DC using 2 x AA size batteries. It accepts an adapter (DC 3V) through a socket on the top side to the far left. | ||
| Case: | Constructed from two pieces of black and white (cream?) gloss plastic. The top area is dominated by an inset, wrap over brushed aluminium panel with black printing for the brand and model number. The neutral and black bordered plastic display filter is flush and very slightly tilted. The keyboard surround is a similar inset brushed aluminium panel, though there is no text for the on/off switch. The keys are medium travel with a soft click and individual plastic escutcheons. | ||
| Display: | 8 digit blue VFD with a ninth for negative, memory and overflow indicators. | ||
| Features: | Standard four functions with percentages, square root and four-function memory. | ||
| Age: | 1980 | ||
| Manufacturer: | Unknown, no country of origin and no serial number | ||
| Comments: | Cheap but reasonably well made calculator from this little known brand. The logic is very sound with no major bugs and only let down by the lack of recovery. Quite a high component count considering it's late age. Exactly the same as the Texet 1800. |
| Components: | 1 x cpu: NEC D1803C E02177, 28 pin DIL, 0.6" width
black plastic 1 x 9 digit VFD, flat front glass encapsulated: Futaba 9-ST-11 date code 0H (August 1980) 2 x transistors 5 x diodes 3 x capacitors 2 x resistors 1 x transformer |
| Boards: | The main cpu board (DH-8803) sits on top of the keyboard assembly and is held in place by plastic lugs around the display. The boards are joined by a 15-way block of wires. |
| Construction: | Remove the screw visible from the back. Carefully pop the side lugs (two on the left, one on the right) and hinge off the back from the top. |
| Logic comments: | The (C/CE) key is used to clear the last number entered whilst a second press clears the whole calculator. |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are shown with a "-" in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Divide by zero shows zero and “C” in the far left (ninth) digit and is not recoverable | |
| Overflow shows the result and “C” (or “E” if negative) in the far left (ninth) digit and is not recoverable | |
| Negative square roots are not allowed and result in zero and "C" in the far left (ninth) digit and is not recoverable | |
| Memory store is indicated by a decimal point in the far left (ninth) digit | |
| Memory overflow retains the original number | |
| No bugs found |
