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Calculators: Handheld: Federal F-1
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| Size (approx): |
76mm
x 138mm x 25mm (max) (w,h,d) Weight ?g excluding batteries. |
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Power:
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3.0V DC, 2 x AA size batteries, 0.2W. Also accepts adapter (undefined) through a right side socket about half way up. |
| Case: | Solid feeling palm-sized calculator, with screen more forward. Back is dark brown smooth plastic whilst the front consist of a smooth metal insert and large sized dark green display filter. Painted logo on display and reversed-out text on keyboard has survived well. Very positive buttons with a soft click. |
| Display: | 8 digit green VFD display - ninth digit used for minus and error flags. |
| Features: | Basic four function with percentages |
| Age: | c1975 |
| Manufacturer: | Federal, made in Japan. Serial No. 1404115. |
| Comments: | Little-known name but a quality calculator. Switching on is a bit of a surprise as the digits are much higher (1cm from the top) than you would expect. Sound logic is impressive - I cannot find a bug but the lack of recovery after error is annoying. Shaped case is black matt plastic, open topped with half-moon cut out and stiff back. It also has a cut-out at the bottom to let the air out as you slide it in. Embossed with the word "Federal" on the front. |
| Components: | 1 x cpu; NEC µPD940C R62306, 28
pin DIL, 0.6" width 1 x single round face glass tube 9-digit VFD 1 x Smoothing choke 1 x transistor 7 x capacitors 9 x resistors 2 x diodes |
| Boards: | One keyboard board and one cpu board with no identifying marks. |
| Construction: | One screw on the back (at the top) is undone to lift off the front half. |
| Logic comments: | The Clear key (CE) will cancel last entry whilst the (C) key will clear the calculator completely |
| Overflow on the input of a number is not suppressed - typing in nine digits results in an error that is recoverable using (CE) | |
| There is automatic constant on all functions | |
| The negative sign is shown on the immediate left of a number and travels into the ninth digit to allow eight digit negative numbers | |
| Divide by zero results in "E" in the ninth digit, positive overflows show a "C", negative an "E" and all are not recoverable. |
