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Calculators: Handheld: Rockwell 63R (aka Scientific Slide Rule) (type II)

Size (approx): 85mm x 160mm x 24mm  (w,h,d)
Weight 248g including sealed internal batteries


4.5V DC, 3 x AA size rechargeable batteries.  Accepts an adapter/charger (undefined but 4mm plug, centre positive) through socket on the top side in the middle. 
Case: Sturdy stippled brown plastic case with light beige keyboard surround.  Oversized neutral display cover shows a clear view of the numbers.  Squashy but positive keys are tilted up and pivot around the top.  The raised Rockwell logo and two vertical edges are painted silver and are prone to wear.  The model number is printed on the lower keyboard surround in dark brown along with the key labels. There is a large metallic sticker on the back which is crammed with instructions.
Display: 8+2 digit blue VFD display with a ninth digit (and intervening one) for the minus signs.  Display input starts at the left rather than the normal right.
Features: Standard four functions, square root, change sign, trigonometric, logs, powers, reciprocal, pi, factorial, scientific notation, parentheses, degree/radian conversion, register exchange and eight function memory.  Switch for degrees and radians.
Age: 1976
Manufacturer: Rockwell international, Microelectronic Product Division, Anaheim, California 92803.  Assembled in Mexico, US and foreign parts.  Serial No. 205776.


Classic Rockwell design a little larger than most - and my example even still holds its battery charge!  Odd pivoting keys in the normal Rockwell colours.  The logic is sound with few bugs but let down by lack of recovery. There was apparently three versions of this calculator with different keys - you can see another one at Rockwell 63R type (I)

Components: 1 x cpu: Rockwell A4802CA 7612 (date code week 12 of 1976) 42 pin staggered DIL
1 x 12 digit VFD flat panel glass faced display in its own four sockets
0 x transistors
3 x diodes
2 x capacitors
1 x resistor array CDP14-02 124M-S26 Dale 7545 (week 45 of 1975), 14 pin DIL 0.3" width turquoise ceramic
16 x resistors
1 x transformer/power supply converter: Aztec AA1863/327R06 7605 (week 5 of 1976), 7 pin SIL
1 x rechargeable battery unit: 3 x AA sized units labelled +326R07
Boards: The keyboard assembly is secured to the front and joins the main cpu board by a 22-way plug.  The main cpu board (21075D23Ccan easily be totally removed as it just locates on four plastic pillars.
Construction: There are four screws hidden under the rubber feet on the rear. Prize them off from the outside edge as the screws underneath are offset. The whole of the rear will left off when these are removed.

Logic comments: (CE/C) is used once to cancel the last number entered and a second time to clear the whole calculator.
Input overflow is suppressed, inputting a ninth digit is ignored
Negative numbers are shown with a minus in the ninth (far left) digit thereby allowing full eight digit negative numbers.  Negative exponents in the intervening digit.
There is automatic constant on all four functions
Divide by zero shows a ". .0.0."  and is not recoverable
Overflow shows a ". .0.0."  and is not recoverable
Memory storage is indicated with an upper "n" in the intervening digit.  When you have a negative exponent then this turns to a square.
Overflow in memory stores the overflow result, well almost!
Negative square roots are not allowed and result in an unrecoverable error
The change sign key can be used in mid number entry but not before
The extra functions are accessed by first pressing the (F) key, use (CF to cancel the function select)
nth root of m is calculated by  (m)(Yx)(n)(1/x)(=)
The "EE" key used in isolation creates some strange result try (9)(=)(EE) to give "1." with an exponent of "00" whilst (9)(=)(F)(EE) appear to give the reciprocal. 

The detachable main cpu board is shown on the left.  At the bottom is the wide format transformer unit followed by the multi-way socket for the keyboard.

The small turquoise package at the top right is (I think) is an early resistor array.

Notice the main Rockwell IC (lower middle) with the typical staggered pins.

Compare to the late Rockwell 63R type I.