Tony - welcome back. Is it REALLY 10 years? Agh. Wow. Looks interesting. I'd love to have built one but getting to there from here may be difficult. However, I have a friend whose eyes will light up and another who will be t least highly interested. Many thanks. Russell On 19 April 2016 at 22:07, Anthony Nixon wrote: > Hi all, > > It's been about 10 years since I've had an opportunity to visit the > PIClist again. Nice to see some familiar names still here. > > On the web, I found an old calculator that I used to own back in the > 70's (the Hewlett Packard HP-45) and it brought back a few memories of > my earlier days. I get a bit of free time being a pilot these days, so > I thought I might resurrect myself a bit and see if I could create one > of my own just for something to do. > > I got a bit carried away though and created the whole Classic Series > of calculators from that period and used a PIC16F877 chip which > decodes and executes the original software for the HP35, HP45, HP55, > HP65, HP70 and HP80 models including memory cards for the HP-65. > > The PCB layout is arranged the same and the display uses similar 7 > segment bubble LED display modules although the PIC has support for a > secondary LCD display if required. An accompanying Windows program > allows you to use each of the calculator types on screen, or open them > up and view the working internal registers plus simulate, modify and > experiment with the operating code. The PC program also communicates > with the calculator via the USB port and lets you upgrade the PIC > driver software, change calculator models and transfer programs to the > HP-65 memory cards. > > If anyone has an interest in these old calculators, the project can be > downloaded for free from www.teenix.org > > cheers > > Tony > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .