The HP67 microcode emulator and all associated interfaces, documentation and designs are copyright 2015 Sydneysmith.com.<\/p>\n
This work is based on a physical calculator created by Hewlett Packard. All credit for the original idea, the choice of functions and the layout goes to HP.<\/p>\n
This software builds on the work of a number of people:<\/p>\n
Dave Cochran who did the original microcode for the original calculator<\/a> (HP35) and which evolved into that for the physical HP67 and for this emulator.<\/p>\n Neil Fraser who showed me many years ago that you can write a workable calculator in javascript<\/a>.<\/p>\n Eric Smith who reverse engineered, and wrote Nonpareil<\/a> – an emulator for, the classic HP calculators.<\/p>\n David G Hicks<\/a> who ported it to java.<\/p>\n Peter Monta who did some amazing things<\/a> to read the ROMs in the original hardware.<\/p>\n Jacques Laporte<\/a> who created the original HP67 card reader emulator. (Much of Jacques site is now available here<\/a>.)<\/p>\n Ashley Feniello who showed me that javascript is now fast enough to emulate old processors with his HP35 microcode emulator<\/a>.<\/p>\n Francois Roulet who showed<\/a> me that this was possible even with more complex calculators like the HP65. <\/p>\n None of these people endorse the emulators on this site and they are not responsible for any errors or omissions in the emulators on this site.<\/p>\n (It was my intent to simply use the HP65 emulator I’d modified from Francois’ and plug in the HP67 ROMs. That was the point I discovered that, whilst the ’65 and ’67 are clearly related and the only obvious difference on the outside is the color scheme, there are a LOT of differences inside.<\/p>\n I really came to understand the difference then between the classic calculators and the woodstock models. What was to be a five minute task became a month long activity and a complete rewrite of the internals as guided by Eric’s, David’s and Jacques’ similar work in C\/Java. It’s not a straight port of theirs – as there are a number of differences – but their work clearly contributed.)<\/p>\n","protected":false},"excerpt":{"rendered":" The HP67 microcode emulator and all associated interfaces, documentation and designs are copyright 2015 Sydneysmith.com. This work is based on a physical calculator created by Hewlett Packard. All credit for the original idea, the choice of functions and the layout goes to HP. This software builds on the work of a number of people: Dave … Continue reading HP67u Credits<\/span>