Elektronika MK26
Manufacturer: | Биллур (Billur) (USSR) |
Mfg. date: | 1986-91 |
Size: | 8×14×2,7 cm |
Weight (ready for operate): | n.a. |
Type: | four-function |
Capacity: | 8 digits (input/display) 8 digits (internal precision) |
Operating logic: | semi-arithmetic (Rockwell) |
CPU: | Billur K145IP11A |
Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
Features: | %calculation with percent +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sqrsquare root |
Display: | 9 digit VFD (IB-28A) |
Power: | 4×AA-type battery 6V adaptor |
Interesting features
This machine uses K145IP11A chip, which has some interesting features:Square root of a negative number causes no errors.
Constant-handling mechanism is similar to one used by Rockwell calculators. The previous stored function is executed when the =, or any arithmetic function key (+, -, , ) has pressed. The latter results to the desired operation was stored for further constant calculations.
With using the exchange key ↔ the contents of the Y register is displayed, which can be cleared and overwritten by keying in the new value.
Overflow caused all decimal commas lights up. To clear the error, press the C.
The machine computes multiply and divide operations with floating point, but adding and subtracting dont suppresses meaningless zeroes at the decimal places: 1 + 2.00 = results 3.00. 2 5 + 0.6 = shows 1.0.
After clearing registers with C, the /-/ sign change key can be used before entering the number: C /-/ 3 results -3.
The memory-arithmetic keys causes adding (?+) or subtracting (?-) the X register to/from the memory register, without changing the stored calculation.