HP-45 Internal Pointer Operations

[teenix]

(04-25-2023 08:16 AM)Z80Sarah Wrote:  When I wrote my first simulator, a couple of years ago, I created a disassembler in Excel so I could figure out how the byte contents decoded to instructions, and inevitably errors crept in the transfer over to code. That gave me a clear picture of (a) how beautiful the code is and (b) how 'unyielding' it is. The new simulator is being written because I wanted to get better at Python, but also because I wanted a better way to watch the code as it runs, winding its way through ROMs and bytes.

I wonder how many languages these emulators are in now.

You can use my emulator to view code execution if it's of any help. You can also modify the HP microcode and it will reassemble it and run with the changes. I used it myself to write the simulation code for the HP-10.

cheers

Tony