Synthetic programming (SP) is an advanced technique for programming the HP-41C and Elektronika B3-34calculators, involving creating instructions (or combinations of instructions and operands) that cannot be obtained using the standard capabilities of the calculator.[1]
Some HP-41C instructions are coded in memory using multiple bytes. Some of these sequence of bytes correspond to instructions the calculator is able to execute, but these cannot be entered in the program memory using conventional program entry methods (i.e. using the calculator as described in the user's manual). Synthetic programming uses a bug in the calculator firmware to enter those byte sequences as a sequence of other instructions, then partially skipping halfway through the first instruction, so that the calculator believes the end of the first instruction is actually the beginning of a new one. This was called byte jumper or byte grabber.
It is not clear if the creators behind the HP-41 were aware of all these "black holes". HP did not officially support these techniques, but probably was intrigued by the strange operations and in some cases allowed enthusiasts to practice in their offices and helped to improve it among a whole sense of curiosity.
HP-15Cedit
Synthetic programming is also possible on the (original) HP-15C.[2][3]
^Ristanovic, Dejan; Proti, Jelica (2012). "Once Upon a Pocket: Programmable Calculators from the Late 1970s and Early 1980s and the Social Networks Around Them". IEEE Annals of the History of Computing. 34 (3): 55–66. doi:10.1109/MAHC.2011.63. S2CID 15888694.
^Smith, Eric L. "Brouhaha" (2023-01-30) [2004]. "HP-15C Synthetics". from the original on 2023-09-25. Retrieved 2023-09-25.
^"HP 15C Synthetics and Synthetic Programming". Retrieved 2022-08-10.
Further readingedit
Wickes, William C. (1980). Synthetic Programming on the HP-41C. ISBN0-96252580-4.
Jarett, Keith (1982). HP-41 Synthetic Programming Made Easy. United States: Synthetix.
synthetic, programming, synthetic, programming, advanced, technique, programming, elektronika, calculators, involving, creating, instructions, combinations, instructions, operands, that, cannot, obtained, using, standard, capabilities, calculator, some, instru. Synthetic programming SP is an advanced technique for programming the HP 41C and Elektronika B3 34 calculators involving creating instructions or combinations of instructions and operands that cannot be obtained using the standard capabilities of the calculator 1 Some HP 41C instructions are coded in memory using multiple bytes Some of these sequence of bytes correspond to instructions the calculator is able to execute but these cannot be entered in the program memory using conventional program entry methods i e using the calculator as described in the user s manual Synthetic programming uses a bug in the calculator firmware to enter those byte sequences as a sequence of other instructions then partially skipping halfway through the first instruction so that the calculator believes the end of the first instruction is actually the beginning of a new one This was called byte jumper or byte grabber It is not clear if the creators behind the HP 41 were aware of all these black holes HP did not officially support these techniques but probably was intrigued by the strange operations and in some cases allowed enthusiasts to practice in their offices and helped to improve it among a whole sense of curiosity HP 15C editSynthetic programming is also possible on the original HP 15C 2 3 See also editCasio FX 602P series Illegal opcode Logic synthesis NOMAS support Overlapping instructions Self modifying code Side effect computer science Variable length instruction set Yeggogology Cyrillic Eggogologiya References edit Ristanovic Dejan Proti Jelica 2012 Once Upon a Pocket Programmable Calculators from the Late 1970s and Early 1980s and the Social Networks Around Them IEEE Annals of the History of Computing 34 3 55 66 doi 10 1109 MAHC 2011 63 S2CID 15888694 Smith Eric L Brouhaha 2023 01 30 2004 HP 15C Synthetics Archived from the original on 2023 09 25 Retrieved 2023 09 25 HP 15C Synthetics and Synthetic Programming Retrieved 2022 08 10 Further reading editWickes William C 1980 Synthetic Programming on the HP 41C ISBN 0 96252580 4 Jarett Keith 1982 HP 41 Synthetic Programming Made Easy United States Synthetix Dodin Jean Daniel 1985 Inside the HP 41C ISBN 0 9612174 4 8 Mier Jedrzejowicz Wlodzimierz Wlodek Anthony Christopher 1985 Extend Your HP 41 ISBN 0 9510733 0 3 McCornack Alan Jarett Keith 1987 HP 41 Advanced Programming Tips ISBN 0 9612174 6 4 Smith Eric 2004 09 26 Microcode Level Calculator Simulation PDF Hewlett Packard Handheld Conference in San Jose California USA http www jeffcalc hp41 eu divers files ppcjt v1n3 pdf nbsp This computer programming related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Synthetic programming HP 41 amp oldid 1180082375, wikipedia, wiki, book, books, library,
