Brand: | COMPEX |
Model: | SR-55 |
Type: | Scientific calculator |
Picture: | |
Batteries: | AA x 3 |
Lifetime: |
Introduced: 1976 Terminated: unknown |
Notes: |
The COMPEX SR-55 is a plain scientific calculator. Judging from the look
of this calculator, and also it’s model designation, this is probably a
commodore calculator rebranded by COMPEX.
I have also found a COMPEX SR-40, but the one I found is broken and I haven’t therefore added it to my calculator collection. The circuit board of the SR-40 is identical to the circuit board of the SR-55. The difference is that the SR-40 lacks all scientific functions from the keyboard. The "y^x"-key performs the decimal log of a number. The fluorescent display is oriented left-to-right, meaning that when you type a number the first digit shows up on the left side of the display, and following digits are appended at the right. This calculator has some nice display features as well: When the calculator’s memory stores a non-zero value, the bottom-right segment of the leftmost digit of the calculator’s display lights up, as shown on the example on the right. And when the calculator’s has a pending parenthesis (out of a maximum of 2 pending parenthesis operations), the top-left segment of the leftmost digit of the calculator’s display lights up, as shown on the example on the right. |
©2024 Ernst Mulder