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Calculators: Handheld: Sharp Elsimate EL-204

Size (approx):

75mm x 127mm x 21mm (max) (w x h x d)
Weight 114g not including batteries.

Power: 9.0V DC, 0.4W using 1 x PP3 size battery.  It accepts an adapter (9V DC 15mA) through a socket on the top side to the far right. 
Case: The case is two-piece, the lower half in beige smooth and the upper in black matt plastic.  It is very slightly wedge shaped.  A small metallic printed red and black with the company name and model number plate sits in its own recess above the display.  The purple display filter sits in a recess and is surrounded by silver painted escutcheon, which is starting to wear on my example.  The display is OK but the digits are rather small and have a narrow angle of view.  The keys are long travel squishy action and each sits in its own recess with a silver printed label.
Display: 8 digit red LED with bubble lens with a ninth digit for negative, memory and error indicators.
Features: Standard four functions with percentage, change sign, square root and four-function memory.
Age: 1976
Manufacturer: Sharp Corporation, made in Japan.  Serial number 72020003 is on a sticker on the inside of the battery compartment.  There is also a large patent sticker on the back.
Comments: Slim but solid model.  Why is it that all the Sharps I ever pick up need a really good clean?  Keys work surprisingly well for the dreadful rocking action.  The logic is very sound ? I can?t find any bugs.  The original case is soft black plastic with an open top and the word "Sharp" embossed on the front and "Made in Japan" on the back.

Components: 1 x cpu; Texas TMS0956NL KGS7706 (week 6 of 1977), 28 pin DIL, 0.6" width
1 x 9 LED unit with bubble lens: Sharp MI6A
0 x transistor
1 x diodes
2 x capacitors
4 x resistors
1 x coil
Boards: The main cpu board (F1417CCA) sits loosely on top of the keyboard assembly and is connected by a 15-way ribbon cable.  The keyboard is attached to the front with 6 screws.
Construction: Remove the two screws located on the back.  Tricky - separate the bottom rear and hinge off the front.  The two lugs at the top of the battery compartment appear to be too big to release from the top.  The back will then lift away.

Logic comments: The (CE) key is used to cancel an entry whilst the (C) key clears the whole calculator
Input overflow is suppressed inputting an ninth digit is ignored
Negative numbers are shown with a "-? to the immediate left of the number, travelling into the far left (ninth) digit, thereby allowing full eight digit negative numbers.
There is automatic constant on all four functions
Divide by zero just shows ?C? in the far left (ninth) digit and is recoverable using (CE)
Overflow shows the result and ?C? (or ?E? if negative) in the far left (ninth) digit and is recoverable using (CE)
Negative square roots are not allowed and result in ?C? in the far left (ninth) digit and the result.  It is recoverable using (CE)
There is indication of memory store by an upper ?I? in the far left (ninth) digit