bluehash 1,581 Posted August 12, 2013 Share Posted August 12, 2013 .. Via reddit: http://files.righto.com/calculator/TI_calculator_simulator.html oPossum and simpleavr 2 Quote Link to post Share on other sites
simpleavr 399 Posted August 12, 2013 Share Posted August 12, 2013 Good project idea. Have it implemented physically on a Launchpad w/ 7 segment leds + tactile button array. I already got the hardware setup, just need to find the time.... Quote Link to post Share on other sites
jpnorair 340 Posted August 12, 2013 Share Posted August 12, 2013 My grandmother used to have one of those. In fact, I bet she still has it. I remember it worked great, even through the nineties. It probably still works. Some of us may remember (or have read about) the discovery of speak-n-spell innards in MiG-25 radar systems. Quote Link to post Share on other sites
bluehash 1,581 Posted August 12, 2013 Author Share Posted August 12, 2013 Some of us may remember (or have read about) the discovery of speak-n-spell innards in MiG-25 radar systems. More info ? :-o Good project idea. Have it implemented physically on a Launchpad w/ 7 segment leds + tactile button array. I already got the hardware setup, just need to find the time.... Looking forward to it! Quote Link to post Share on other sites
jpnorair 340 Posted August 12, 2013 Share Posted August 12, 2013 More info ? :-o There doesn't seem to be a lot of information online, and I don't remember the entire story, but a reliable source told me that we found after the cold war that the Soviets had been purchasing speak-n-spell devices in order to harvest a DSP chip. I think it was used in a radar or guidance system of some kind, maybe for the MiG but possibly for something else. The Soviets copied all kinds of ICs from us, but their fabrication was a long way behind so I guess it was cheaper to just buy the speak-n-spells. Granted, for years the CIA was purchasing Titanium from the soviet union in order to build SR-71s. Also, not too long ago Saddam was halted while trying to buy a ton of PS2's. spirilis and bluehash 2 Quote Link to post Share on other sites
rockets4kids 204 Posted August 13, 2013 Share Posted August 13, 2013 The Sinclair scientific version using the same chip -- and possibly even the same codespace -- seems *far* more interesting!!! Quote Link to post Share on other sites
simpleavr 399 Posted August 30, 2013 Share Posted August 30, 2013 The Sinclair scientific version using the same chip -- and possibly even the same codespace -- seems *far* more interesting!!! And has been made available. http://files.righto.com/calculator/sinclair_scientific_simulator.html Someone has to realize this on msp430. GeekDoc and oPossum 2 Quote Link to post Share on other sites
Druzyek 36 Posted August 31, 2013 Share Posted August 31, 2013 I have been working on something similar for the last few months. Mine is based more on HP calculators, though. I'm using a 20x4 LCD so the interface should look similar to an HP-28 or HP-48 series model. I wanted to add keystroke programming too but the firmware is already at 14K without it. I added a second G2553 so I can hopefully split up the tasks between the two and still have enough flash. I think a G2553 would work fine to remake either of those calculators. Here is my blog in case you are interested: http://joldosh.blogspot.com/ simpleavr and bluehash 2 Quote Link to post Share on other sites
simpleavr 399 Posted August 31, 2013 Share Posted August 31, 2013 I have been working on something similar for the last few months. Mine is based more on HP calculators, though. I'm using a 20x4 LCD so the interface should look similar to an HP-28 or HP-48 series model. I wanted to add keystroke programming too but the firmware is already at 14K without it. I added a second G2553 so I can hopefully split up the tasks between the two and still have enough flash. I think a G2553 would work fine to remake either of those calculators. Here is my blog in case you are interested: http://joldosh.blogspot.com/ Good work you have there. It's amazing to learn how they did math w/ limited ram / rom back then. Quote Link to post Share on other sites
simpleavr 399 Posted September 22, 2013 Share Posted September 22, 2013 It's bound to happen. Currently I am re-using a UI shield from my ez430trainer project. http://forum.43oh.com/topic/3013-ez430trainer-a-retro-style-single-board-computer/ I am trying to locate those bubble led displays. It would be interesting to have a single PCB build for a daily use calculator. oPossum and Rickta59 2 Quote Link to post Share on other sites
abecedarian 330 Posted September 23, 2013 Share Posted September 23, 2013 These? Quote Link to post Share on other sites
simpleavr 399 Posted September 23, 2013 Share Posted September 23, 2013 @@abecedarian Right on, exactly what I need. Thanks for the find. I did look at ebay and found another one (same) but the one I found goes for $15+ (w/ shipping) and it's way out of what I want to spend. I will get these to play w/. Now I need to figure out a way to drive them w/o additional circuitry. The look of it requires 9 digits + 8 segments, that's already 17 IO pins, then there is uart, etc. Might need to get the 28pin G2553 (which is OOS from newark.ca, they only have 20pin tssop or QFN). But I always tries to use all thru-hole. What to do? 595s? Decade decoder for digit scanning?. Quote Link to post Share on other sites
simpleavr 399 Posted September 24, 2013 Share Posted September 24, 2013 Code for the adventurous. Launchpad w/ a G2553 is enough to run emulator via terminal, no LED + Button Booster needed. https://github.com/simpleavr/tms0800 Rickta59 1 Quote Link to post Share on other sites
simpleavr 399 Posted June 4, 2014 Share Posted June 4, 2014 Bump. Finally moved the emulator to a single PCB design (after one failed PCB design). Now my kids can take them and use them in school. Source code can be found at https://github.com/simpleavr/tms0800. Source code based on Ken Shirriff and other's work, please see http://righto.com/ti and http://righto.com/sinclair A few photos... PCB design available upon request. reaper7, timotet, RobG and 7 others 10 Quote Link to post Share on other sites
timotet 44 Posted June 4, 2014 Share Posted June 4, 2014 Great work ! simpleavr 1 Quote Link to post Share on other sites
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