The TRS 1300P is a programmable calculator. That is what the ‘P’ stands for. It was introduced in a period during which changes took place very rapidly. It contains one large calculator-IC (NEC D1200C), some small scale integrated circuits and some discrete components.
The programming feature allows storage of a tiny 14 steps program. The machine uses the Grand Total register for this purpose. Digits and GT (halts a running program) take one step, other operations take two steps. The original manual contains some programming examples, one of which is entering the current date. It can then be printed with a singe key-stroke. Other examples include the calculation of an average out of a sequence of numbers and a tax calculation.
The manual that came with the machine also contains a supplement with another eight programming examples.
Use the “+” and “--” key to add to the Total register. Using the “M” version stores the result in Memory.
Enter 1st number, push the “X”-key, enter the 2nd number, push the “=” key.
To add the result to the Total register use the “+” key in stead of or after the “X”-key. To subtract use the ”--” key
To add/subtract the result in Memory use the “M+” / ”M--” key
Like multiplication as described above, but using the “:” key in stead of the “X” key.
Function of some keys, switches etc.
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Addition, Subtraction, Multiplication, Division, Square Root, Limited programmable
1977 ? (It does not appear in Büromaschinenlexicon)
Ca. DM 300 ?
(The Brother 122PDR seems to be a similar calculator but without programming feature. It was priced DM. 269 in 1978)
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