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Calculators: Handheld: Sharp Elsimate EL-1101
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Size (approx): | 100.5mm x 175mm x
41.5mm (closed) (w,h,d) Weight 350g including carry strap but excluding batteries |
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Power: |
6V, 0.6W through 4 x AA sized batteries. Rechargeable batteries (EA-12B) can be used. It accepts an adaptor/charger (EA-11E, centre negative) through a socket on the top side to the right. The on/off switch is on the right hand side in line with the carry strap ring. The battery compartment has a ribbon to aid battery removal. | ||
| Case: | The main case is made from two pieces of matt black plastic. The sides are dominated by sturdy brushed aluminium panels and the left side has a ring through which a black plastic carry strap can be attached. The front top area has a display escutcheon with a recessed green plastic filter for the display. It gives a clean bright image. This also contains a black and red printed metallic sticker with the model information which sits in its own recess. The three switches below the display have their own white printed labels. The large keys are long travel, hollow sounding and quite springy. | ||
| Display: | 10 digit green VFD with a eleventh for negative, memory and error indicators | ||
| Features: | Four standard functions with percentages and three function memory. Switched fixed decimal mode with round up/down or round down, switched number of decimal points in fixed mode and switched constant. RPN logic. | ||
| Age: | 1975 | ||
| Manufacturer: | Sharp Corporation, made in Japan, serial number: unknown | ||
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Comments:
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More of a compact desktop than a hand-held calculator, though you just about use it in your hand. Very solid feeling and working well to this very day. Bright display which is easy to read with the Sharp-common right hand side symbol digit. The logic is let down by the lack of recovery, negative zero bug and archaic RPN. The original case is double top popper topped soft black plastic with silver printed Sharp on the front. |
| Components: | 1 x cpu; Hitachi HD3683 5H 31
(date code August 1975), 42 pin 0.6" width black plastic 1 x 11 digit VFD unit: single glass tube flat faced 2 x transistors 11 x diodes 7 x capacitors 5 x resistors 2 x resistor arrays 1 x transformer: TDK 1264 Japan |
| Boards: | The large main keyboard assembly PWB F1247CCZZB sits loose above the main board and supported by plastic pillars. It is joined to the main board 18-way ribbon cable. The main cpu board is attached to the rear by plastic clips. |
| Construction: | Remove the single screw from the back inside the battery compartment. This doesn't help much as the case is held together with internal lugs. Quite difficult and easy to damage your calculator - so if in doubt - don't try. I found the best way was to start at the bottom by levering in the rear section of the case. Travel up the sides slowly popping the multiple lugs. The front will eventually lift out to the right to pivot around the on/off switch. You will need to tape down the three switches as these will fall apart easily. |
| Logic comments: | The (CE) button is used to clear last entry of a number and the (C) to clear the whole calculator. |
| Overflow on number input is suppressed, keying in an eleventh digit is ignored | |
| There is switched constant on all four functions by setting the "K" switch, the "N" must stand for normal, which is odd as constants became the norm | |
| An overflow error shows the result and "C" ("E" if negative) in the far right (first) digit and is not recoverable | |
| Divide by zero results in "0.C" and is not recoverable | |
| Negative numbers are flagged by a "-" sign in the far right (first) digit thereby allowing full ten digit negative numbers | |
| Memory store is indicated by the decimal point of the far right (first) digit and is cleared by pressing (RM CM) twice | |
| You cannot overflow the memory, if you try you get a display of "0.C" and the memory contents stay intact | |
| A switch changes between floating decimal mode [F], round up/down fixed [5/4] or round down fixed [V]. Another switch defines the number of digits in fixed decimal mode [ 4/2/0] | |
| The logic is Reverse Polish Notation: to do 4-5 key in (4)(+=)(5)(-=) to get "-1" | |
| It suffers the negative zero bug: key in (4)(+=)(5)(-=) to get "-1" then (1)(+=) with give "-0" |
