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Calculators: Handheld: Sperry Remington 663 (type II)

Size (approx):

85mm x 155mm x 27mm (w,h,d)

Weight 196g excluding batteries. 

Power: 6V DC, 4 x AA size batteries.  Accepts an adapter/charger (AD-4145 0.4W) through a top side socket on the right.  
Case: Slab-shaped calculator with rounded edges and bowed top and bottom. It is a two piece light beige gloss plastic case , which on my example has yellowed from UV exposure. A set of two embedded escutcheons surround the display and keyboard.  The oversized neutral display filter gives a good image below which there is a smooth black plastic strip.  This has a printed sticker in its own recess and a raised "on" label. A keyboard surround in matt black plastic is recessed about the same depth.  They keys are long travel hollow sounding but work well enough.  There is a lug to the top left that allows a carry strap to be fixed.
Display: 6 digit blue VFD display with no extra digit for indicators.  There is a shift function for 12 digit answer display.  The numbers are the "small Zero" type (see below).
Features: Four function with display shift.
Age: 1974
Manufacturer: Sperry Remington is a trade mark of Sperry Rand Corporation.  Made in Japan.  Serial number 2122286 on battery compartment cover.  There is a further number 3047458 on the inside of the compartment.
Comments: Nice to hold, weighty calculator with archaic display.  The six digit with shift form was used to save power and money but was not ideal and was soon phased out.  It suffers from the same "divide by zero counter" bug that is common to Casio of this time.  IN fact, from the keys and double stickers it looks like it could have been made by Casio.  There was an earlier type of the Sperry 663 model with the same functions but in the style of the Sperry 661D

Components: 1 x cpu: Hitachi HD32170P 4B 1 (February 1974) 28 pin DIL  0.6" width
1 x single glass tube, round faced 6 digit VFD display
5 x transistors
11 x diodes
13 x resistors
3 x resistor arrays
16 x capacitors
1 x transformer module; Fuji MCT 0625 4A-02 
Boards: The keyboard assembly sits on top of the main board and is connected by 9 wires.  It has two cut-outs to allow some of the vertically mounted components to poke through.  The main cpu board (D1-IS2471X4) sits lose on the back and is very densely packed.
Construction: Remove the small screw on rear.  Gently pop in the two small side lugs by squeezing in the front section, then hinge off the front from the bottom two lugs.

Logic comments: The clear key (C) is used to clear an input number and the (AC) key to completely reset the calculator
Overflow on the input of a number is suppressed, typing in a seventh digit is ignored
There is automatic constant on all four functions 
If the result of a calculation is greater than six digits then you use the display shift key (>) to see the other least significant digits.  This is not recoverable.
Negative numbers are flagged by a "-" sign in the far left (sixth) digit until you get to five digit numbers, when it reverts to the first digit of the shifted display.
For a really neat bug try dividing by zero; key in (0)(/)(0) which results in the display "000000" then press the shift key to see the clock counting!

display

Note the unusual way that zero is represented - by only using the lower half of the digit (representative image).