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Calculators: Handheld: Commodore 887ND
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Size (approx): | 75mm x
146mm x 25mm(max) (w,h,d) Weight 106g excluding batteries |
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Power: |
9V DC, using 1 x PP3 size battery. It accepts an adaptor (DC-620R or 505 or 506 or 507) through a socket on the top side on the far right. You can use the adaptor with the batteries in place. | ||
| Case: | Two piece matt plastic case in dark cream. The top area hosts a raised and painted silver Commodore name. Typical key colour scheme from Commodore and the small keys are very squishy but work well enough. The red plastic flat filter over the display is heavily inset so that the case forms a light screen. Display is very clear and large though rather limited in viewing angle. The keyboard surround in matt black plastic is rather like the earlier minuteman/green line series with raised areas for each key and an embossed "on" label. | ||
| Display: | 8 digit red LED with bubble lens with a ninth digit for negative, memory and error indication. | ||
| Features: | Standard four functions, percentages, register exchange and four function memory. | ||
| Age: | 1977 | ||
| Manufacturer: | Commodore Business Machines Inc., Palo Alto, California, made in Hong Kong, serial No. 42237. | ||
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Comments:
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One of a large range, I think these wider models are much more attractive than the thin ones. It remains, however, typically Commodore. The logic is very good, with good recovery and no bugs that I can find other than the odd ability to carry on after an overflow or divide by zero.. |
| Components: | 1 x cpu: MOS MPS 7653 4777 (week
47 of 1977), 24 pin DIL, 0.6" width 1 x IC: ITT 548-5N 7627 (week 27 of 1976), 22 pin DIL, 0.3" width 1 x 9 digit single unit bubble lens LED display 1 x capacitor 1 x resistor |
| Boards: | The main CPU board (TW-17 Rev A) sits loose above the keyboard assembly (200454-01 200454-02 KB6373-01 HEC) and is connected by a 16-way ribbon cable. The latter is fixed to the front with 9 screws. |
| Construction: | Remove the two screws from the back of the case. Gently push the two lugs in the lower section cuts outs and squeeze off the back. There are two inner lugs that can be seen from within the battery compartment so hinge from the top. |
| Logic comments: | (C) is used once to cancel the last number entered and a second time to clear the whole calculator so it should be labelled C/CE |
| There is automatic constant on all four functions | |
| Input overflow is suppressed, inputting an ninth digit is ignored | |
| Negative numbers are shown with a "-" in the immediate left hand digit travelling into the far left (ninth) to allow eight digit negative numbers. | |
| The (MR) key recalls the memory, the (MT) key recalls and clears the memory | |
| Memory store is indicated by the far left (ninth) digit's decimal point | |
| It is possible to store an overflow in the memory and later recover it by continual division by 10 | |
| Divide by zero shows "E00000000" (no decimal point) and is recoverable by dividing by one | |
| Overflow shows the result with "E" (negative or positive) in the left most (ninth) digit and is recoverable by continual division by 10 (or a multiple). The maximum number you can recover from is x1048 as you can carry on using the overflow number | |
| (EX) is used to exchange the display with the register | |
| The (%) button divides by 100 so can also be used to recover from overflows |
