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Calculators: Handheld: Brother 201
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Size (approx): |
88mm
x 153mm x 33mm(max) (w,h,d) |
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Power: |
6V DC, 4 x AA size batteries, 60mA. Does accept an adapter (undefined but 4mm plug, positive polarity) through a socket on the right side at the top. There is a small printed aluminium panel by the adapter socket reminding you of the power requirement. The battery compartment has a ribbon pull to aid battery extraction. | ||
| Case: | Very sturdy two-piece white smooth plastic case. It has a flat bottom and rounded top. Keyboard has a brushed aluminium surround which matches the two panels below the display. One of these is printed with a black company name and model block. The neutral, angled, display filter also has white printed digit numbers and sign reminders. There is an extensive instruction panel on the back on another aluminium panel. Simple colour scheme works well and the keys are soft touch short travel but work very well. | ||
| Display: | 8 digit blue VFD display with ninth digit for negative, error and memory signs. | ||
| Features: | Standard four functions, percentages, square root, sign change and two function memory. | ||
| Age: | est. 1975 | ||
| Manufacturer: | No manufacturer's name or model number, made in Japan, serial number (label inside battery compartment) 750518453 | ||
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Comments:
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This calculator just oozes quality. Solid feel, bright display, quality keys and sound logic but the lack of error recovery is a nuisance. The original cover is soft black plastic with flip over top and front popper closing. It also has a full length plastic carry strap. |
| Components: |
1 x cpu: NEC µPD276C H52166 28 pin DIL, 0.6" width |
| Boards: | The keyboard assembly (Ref KBM-925S) sits loosely over the main cpu board and is connected by 16 long flexible wires. |
| Construction: | Undo the three screws on the back and gently lift of the front, hinging from the bottom. The keyboard assembly will separate from the front. |
| Logic comments: | (C) cancels an incorrect numerical entry on the first press and clears the calculator on the second so it is a CE/C key really |
| There is switched constant with the K key which works on all four functions | |
| Input overflow is suppressed, inputting a ninth digit is ignored | |
| Negative sign is shown in the far left (ninth) digit thereby allowing full eight digit negative numbers | |
| Divide by zero shows "C" in the far left (ninth) digit and is not recoverable | |
| Overflow is shown by the result and "C" ("E" if negative) in the far left (ninth) digit and is not recoverable | |
| Memory storage is indicated by the far left (ninth) decimal point alight | |
| Using the memory is a slight odd; (M=) key actually add the displayed number or result of a calculation into the memory, (MRC) recalls on the first press and clears on the second. | |
| Low batteries are indicated with an upper left "l" segment of the far left (ninth) digit alight | |
| Negative square root are not allowed, resulting in "C 0" displayed which is not recoverable. | |
| After about 20 seconds the display switches to power save mode by lighting the middle (fifth digit) "-" only. Touch a function or (=) to continue. | |
| Percentage key just divides the current number by 100 |
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The scan on the left shows the calculator with
the front section removed.
Very similar design principle to a lot of Decimo models. Most of the components (like the IC) are hidden underneath the keyboard assembly (about where the Brother logo is). |
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