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Calculators: Desktop: Sanyo ICC-805
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Size (approx): | 145mm x
235mm x 65mm(max) (w,h,d) |
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Power: |
Mains (240V 50/60Hz, 5W) power only through a permanently fixed mains cable of considerable length. | |
| Display: | 8 digit green VFD with a ninth digit for overflow and negative indication. Eighth segment used for number four. | |
| Features: | Standard four functions with register exchange. Switched constant. Semi reverse polish notation (arithmetic). | |
| Age: | 1973 | |
| Manufacturer: | Sanyo Electric Co. Ltd., made in Japan, serial number 86079923. | |
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Comments:
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Basic calculator that is very sturdy, if somewhat dull. The case and model name was used up until 1975 at least with different functions and internal electronics. The logic is let down by very poor (i.e. none) recovery and lack of input suppression. Couple this with negative zero bugs and oddly labelled keys typical of Sanyo - so no wonder that they revised it. |
| Case and Design: | Very sturdy case is made from two-piece patterned light and dark grey thick plastic with a third matt black section for the display surround. A large chunky on/off switch has embossed labels. Below this is a cooling grid which houses a silver painted raised black label that sits in its own recess. The heavily angled (practically vertical) green plastic display filter is inset and printed with white numeral indicators. The switch labels are embossed and painted brown. |
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| Keys and Switches: | Somewhat scattered key groups are rather bland. Big clunky keys are long travel with a hollow sound and very easy to use. A switch for [K] constant selection sits below what looks like space for another switch. | ||
| Construction: | Remove the four screws from the underside (which may have plastic caps in place). The front can then be removed easily, hinging from the bottom edge. Plenty of metal brackets in side to support the on/off switch, display and keyboard assembly. |
| Boards: | The main cpu board (704 R4170066 Sanyo ICC-805NE M-1-3) sits in the base of the case and is held in place by the two screws that place the metal display rack. It attaches to the keyboard assembly with a 14-way cable gang through an edge connector. |
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| Components: | 1 x cpu: NEC D271D
K34066, 28 pin DIL, 0.6" width white ceramic with metal cap 1 x IC: NEC PD261C K31586, 20 pin DIL, 0.4" width black plastic 2 x IC: Toshiba TM4352P 3-I, 16 pin DIL, 0.3" width black plastic (date code September 1973) 9 x single tube VFD digits 5 x transistors 16 x diodes 1 x bridge rectifier 10 x capacitors 57 x resistors 1 x variable resistor 1 x mains transformer: R-W77101 1 x fuse |
| Logic comments: | (CK) is used to cancel the last number entered and (CA) to clear the whole calculator. |
| Operation is semi-Reverse Polish notation (arithmetic) input. To do 5-3 key in (5)(+=)(3)(-) | |
| Input overflow is not suppressed, keying a ninth digit results in an overflow which is not recoverable | |
| Constant function is switched in with the "K" switch and operates on multiple and divide only. The constant is the first entry on multiply and the second entry for division. | |
| Negative numbers are shown with a minus sign in the far left (ninth) digit thereby allowing full twelve digit negative numbers | |
| Divide by zero shows only "E" in the far left (ninth) digit and is not recoverable | |
| Overflow shows only "E" in the far left (ninth) digit and is not recoverable | |
| (RC) is a register exchange key swapping the dividend and divisor registers | |
| It suffers the negative zero bug: key in (1)(+=)(2)(-) to give "-1" then (1)(+=) gives "-0" | |
| It suffers the divide to negative zero bug: with [K] switched on key in (1)(-)(/)(1)(0)(+=)(+=)(+=) etc to eventually give "-0." |
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The image shows closer detail of the almost vertically mounted individual glass tube vacuum fluorescent display (VFD) units. Held in place by a sturdy metal bracket and rubber positioning caps. Notice the "eighth segment" to the middle right of each digit that allows the number four to have a longer horizontal leg. |
