Hi! I was playing around with the HP-42S built-in memory scanner trying to find out its ROM structure. I've found very usefull a 10 years old post by Jay B. Harlow but I've a couple of questions, maybe some of you can help me:
1) At the functions table (beggining at 1DB61) the whole set of functions of the calc is listed. Each 'register' has a 1 nibble field with the length of the name of the function, followed by the name itself (1 byte per character) and a 5 nibbles field witch should be an address... has anyone got more info about this point? It looks like an index or a relative address, right?
2) The Instruction Set seems to be radical different from the 28 and 48 series one. Does it exist any list with the processor instructions (like the Gariepy's one for the 28/48)?
Thanks