| Calculators: Handheld: Commodore
F4146R (UK Type II)
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Size
(approx):
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80mm
x 150mm x 20-35mm (w,h,d)
Weight 222g including batteries
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Power:
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4.5V
DC, 3 x AA size internal rechargeable battery pack. It accepts an adapter/charger
located on the top side in the middle. Use adapter DC640, 707, 708 or 709, 6
Volts, centre positive. |
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Case: |
Two-piece
stippled black plastic case with no evidence of painted trim. Brand name
plate is raised silver painted letters in a top recess area above the display.
Keys in grey, white, red and blue with functions printed green on
raised letters on
the keyboard surround. The keys are long
travel squishy type but work very well. Heavily inset and tilted red display filter
gives a clean bright image though with limited angle of view. It is
shaped like a linear lens to add further magnification to the LEDs. |
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Display: |
10
+ 2 digit red LED with bubble lens and additional linear lens with a
thirteenth (and third) digit for negative indication. The extra three exponent
digits are about three quarters of the size of the standard digits. |
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Features: |
Four
functions plus percentages, change sign, double memory (with two functions
each and a summation mode).
Additionally it has powers, reciprocal, register exchange, delta percentages
and Financial
functions. |
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Age: |
1976 |
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Manufacturer: |
Commodore,
made in England. Serial No. 100998 |
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Comments: |
I
think these are lovely as they are so strange now that spreadsheets do all
the work for you. With 46 keys is this a button monster or what?
The F prefix of this period indicates a "Financial
model", they used "SR" for Slide Rule (or scientific).
Good idea to install rechargeable batteries as this thing would
have eaten power. This is one
serious calculator, although the "Made in England" means assembled
at best as all the components and boards are Japanese. Logic sound but interesting that such a sophisticated
calculator should have no square root, error recovery To see the USA
version click on Commodore F4146R. |
| Components: |
1 x CPU: Commodore G-04 7632
(week 32 of 1976) 40 pin DIL 0.6" width
1 x unknown IC; Commodore GHU-01A 7636, 16 pin DIL 0.3" width
(perhaps a keyboard multiplexer)
2 x display driver ICs: ITT 546A-5N 7529, 16 pin DIL 0.3" width
1 x 14 digit RED LED with bubble lens
1 x transistor
1 x diode
2 x capacitors
3 x resistors
1 x transformer (loose) Astec AA4082 |
| Boards: |
The keyboard board
(KB-6444-01 Q546 201008) sits underneath the main cpu board (200794 Rev C) and is joined
by a 21-way ribbon cable. An additional 22-way cable links to the
display board. |
| Construction: |
Remove the two long screws from
the back and the rear section comes off easily by hinging from the bottom. |
| Logic comments: |
(CE)
is used to cancel the last number entered and (C) to clear
the whole calculator. |
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There
is automatic constant on multiply and divide only |
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Input
overflow is suppressed, inputting a thirteenth digit is ignored |
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Negative
numbers are shown with a "-" in the far left (thirteenth) digit thereby
allowing full eight-digit negative numbers |
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Divide
by zero shows "E? in the left (twelfth) digit and is not
recoverable |
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Overflow
shows no number with "E" in the left (twelfth) digit and is not
recoverable
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The
change sign can be used in mid-number entry |
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Memory
store is not indicated; you have to remember it |
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The (CMP) key appears
to be compute; to work out 210 use (2)(Yx)(1)(0)(CMP)
and it displays "1024" |
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Without a manual this
is the best I can do for the other keys; |
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(X<>Y)
exchanges the registers, (INT) is not integer or intercept as in some of
the F range, (delta %) is operated by (4)(D%)(5)(=) "25%". |
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(N) enters the amount
of time periods, (I) the percentage interest, (PV) present value, (FV)
future value, (PMT) payment, (DP) could be depreciation? |
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Interesting, the
lower grey keys are designed to be two-key sequences; such as
(PER)(WEEK). If you select one of these keys on its own its acts a a
numerical entry key: i.e. (YEAR) = 1, (SEMI) = 2 etc. |
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