The criteria: these are desktop models that I have in my possession. The SR-60, I just had to have: I used to lug one of these monsters around some 20 years ago in Hungary. The HP-85 was a lucky find at a used electronics store, again in Hungary. The APF-231 was our old cat's favorite. And so on...
| - | Model | Type | Display | Programming model | Programming features | Memory | Special functions |
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APF 231 | Four-function | 12 VFD digits | 256 steps | N/A | 2 registers | Printer, DMS, battery backup |
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HP-85 | BASIC programmable | CRT | 16 kB | N/A | 16 (0) kB | Graphics, tape drive, printer |
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MK-56 | RPN programmable | 8+2 VFD digits | 98 partially merged steps | Conditionals, subroutines, indirect addressing | 14 registers | N/A |
 |
Robotron K1000μC | Scientific programmable | 10+2 LED digits | 3992 steps | Labels, conditionals, subroutines, indirect addressing | 242 (0) registers | Printer |
 |
Rockwell 475P/D | Four-function | 12 VFD digits | 16 steps | N/A | 1 registers | Printer |
 |
Sharp PC-1001 | Scientific programmable | 10+2 VFD digits | 64 steps | N/A | 8 (0) registers | N/A |
 |
Texas Instruments SR-60 | Scientific | 20 LED characters | 480 steps | N/A | 40 (0) registers | Magnetic cards, printer |
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Texas Instruments TM-990/189 | Educational board | 12 7-segment LED characters | 1 kB | Machine language | 1 (0) kB | Machine language educational board |
