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Calculators: Handheld: Canon Palmtronic LD-82
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Size (approx): | 71mm
(max) x 128mm x 22mm (max) (w,h,d) Weight 112g excluding batteries |
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Power: |
3V DC, 3 x AA size battery, 0.3W. Also accepts adapter (undefined) through top side socket on the left. | ||
| Case: | Base and sides are crocodile skin patterned black plastic. Front is smooth black plastic with brushed aluminium keyboard surround. Green display filter has gold painted logo and name which has survived well on this example. Keys are wobbly with a positive click. On/off switch is on the left hand side about 3/4 of the way up. | ||
| Display: | 8 digit green VFD (ninth used for minus and error flags) | ||
| Features: | Basic four function with percentages and square root | ||
| Age: | 1975 | ||
| Manufacturer: | Canon Inc, Japan. Serial number 107157 | ||
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Comments:
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Nice enough calculator let down by some possible maths errors. Blue and yellow colour scheme is nice, but doesn't match the very green display. Original black leatherette case is open top with embossed Canon word. The square root takes a second and all the digits cycle - lovely! |
| Components: | 1 x cpu: Texas TMS0855NC A7529
(Week 29 of 1975) 28 pin DIL 1 x 9 digit round single tube VFD display 2 x transistors 5 x diodes 6 x capacitors 2 x resistor arrays 4 x resistors 1 x transformer; CD-1012 TDK Japan |
| Boards: | The main keyboard is attached to the front by one screw. The main cpu board (Ref: Canon X67-6479-03) is connected by 20 stiff copper connectors. A third small sub-assembly board houses the DC adapter input circuitry. |
| Construction: | Starting from the behind and the top, gently squeeze in the front of the case to unlock the internal lugs. The back hinges at the bottom then to the right. To further examine the boards you will need to remove the on/off switch and adaptor socket. |
| Logic comments: | The (CL) button is used to clear last entry of a number the (C) button to completely clear. |
| Overflow on number input is suppressed, typing in a nine digit number ignores the ninth digit | |
| An overflow error is flagged with "u" in the ninth digit, "o" if negative, error is recoverable by use of the (CL) button. | |
| When an overflow error is encountered the position of the decimal point from the right indicates how many digits are overflowed. | |
| There is automatic constant all operators. | |
| Negative numbers are entered using the (-) button first. | |
| Negative numbers are flagged by a "-" sign in the ninth digit | |
| You can square root a negative number without error. | |
| Try this; (5)(-)(5)(=)(square root) and get "0.0000000" | |
| There appears to be a logic error; square root 1.0000001 to get 1, then subtract 1 to get "-1". Let me know if yours does this or is it the ageing chip? |
