The Windows calculator emulators, hp29w and hp67w, come with the same advanced features as the HTML5 microcode versions did. They just work a little differently and there are some additional features. Continue reading The New Calculator Debuggers
Tag Archives: hp29internals
Continuous Memory Error
Hewlett-Packard produced calculators in the late 1970s which came with “Continuous Memory”. This retained programs and data in the calculator even when it was switched off. Continue reading Continuous Memory Error
HP-29 Scan Codes
A calculator keyboard gets scanned to see which, if any, key has been pressed.
It is a fairly simple process. The calculator activates each keyboard row in turn, and checks to see if a signal appears in any of the columns. Each key connects a different row to a different column. It looks like this: Continue reading HP-29 Scan Codes
