RPN-1250
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09-27-2015, 06:17 PM
Post: #1
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RPN-1250
Following the repurposing of the TI-1200 into the RPN-1200 RPN scientific calculator, I wanted to take the challenge of making a programmable version by repurposing the TI-1250, which is has the same enclosure and basic design as the TI-1200 but has an extra row of keys (6 rows instead of 5 for the TI-1200). The result is the RPN-1250 (see pictures)
The design is based on a 64kbyte flash Microchip PIC 18F2680 driving a MAX 7219 8-digit 7-segment LED driver. The software is programmed in C with the Microchip IDE MPLAB X. Functionalities as below: - 4-level stack RPN scientific with conversions - 20 memories (0 to 9 and .0 to .9) with store and recall arithmetic - All memories and stack can be saved to and recalled from the 'constant' flash memory of the PIC - programmable 98 steps (like the HP-29C) with alphanumerical display of the program - 3 programs can be saved to and recalled from the 'constant' flash memory of the PIC - 20 labels (0 to 9 and .0 to .9), subroutines, all 12 tests, PAUSE and VIEW functions, SST execution - Speed roughly 8X the HP-41C What it does not have (vs HP-29C) is: - ISZ/DSZ - indirect addressing - ABS function but this can be easily programmed as x<0? CHS - Polar/Rectangular conversions (sorry Den) There can easily be implemented but there are not any keys left to include them without complicating the UI - any suggestions? Hope I will have a chance to show it to HHC 2016 ! Benoit |
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Messages In This Thread |
RPN-1250 - Benoit Maag - 09-27-2015 06:17 PM
RE: RPN-1250 - Harald - 09-27-2015, 08:40 PM
RE: RPN-1250 - Jonathan Cameron - 09-27-2015, 09:42 PM
RE: RPN-1250 - matthiaspaul - 09-28-2015, 02:01 AM
RE: RPN-1250 - Benoit Maag - 09-28-2015, 02:36 AM
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