HP 11C internal number format?

[Dieter]

(03-17-2018 10:05 PM)michaelzinn Wrote:  Thank you, that is very helpful.

You may try Warren Furlow's V41 emulator (HP-41CX) which has a very nice machine code console. Here you can see the internal microcode at work. But some patience is required: a simple "LN" or "SIN" may take hundreds of CPU commands until the result is returned. Try a simple addition first. ;-)

Type 2 [ENTER] 3, then options > console, check [x] Run and press the [+] key. You can see the LCD go blank and the "+" appear (the '41 briefly shows the command name if the respective key is held down), then the internal registers are loaded with 2 and 3, eventually the result 5 shows up and the result is written to the display again. If you do a division you can also see the internal roundoff routine at work. Hint: there is a slider to control the execution speed.

Dieter