s5 is used to record “memory full”. Here’s an example: Continue reading HP65 s5 – Memory Full
Tag Archives: hp65internals
The HP65 Wait Loop
When the HP-65 calculator is sitting idle, waiting for you to get it to do something, what is it thinking? What’s going through its head? Continue reading The HP65 Wait Loop
The HP65 M Register
The M register in the HP-65 is used for a lot of very interesting things. Maybe not quite “give me the contents of the M register and I’ll show you the world”; but it is very close to that. Continue reading The HP65 M Register
The HP65 Buffer
There is a variable in the HP65 emulator named simply “buffer”. What is it? What does it do? Why is it there? Continue reading The HP65 Buffer
HP65 Flags
The HP-65 calculator has two flags and you can set, clear or test these in your programs. They allow you to remember choices or situations for later. Something happens. You use f SF 1 (or f SF 2) to remember it, and later you use f TF 1 (or f TF 2) to choose between two different courses of action.
Where are the flags stored? How does it do all that? Continue reading HP65 Flags
