35s program checksums

[toml_12953]

(04-01-2015 08:09 PM)Thomas Radtke Wrote:  There are several stories about this. If I'm not mistaken, one HP engineer has had a look at the machine code and commented it was to difficult to work on it (source was likely Assembler, as one member speculated after disassembling the emulator code).

I don't buy that. The 65xx series was the most popular CPU of its day. KIM, PET, Apple, Commodore 64, all used its assembly language. Most people who coded in assembly were familiar with the 65xx instruction set. That chip sold far more than any other, 8080A and Z-80 included. Yes, Intel chips have eclipsed them but how many programmers today use assembly on the AMD64 or x86 platform? The pool of knowledgeable 65xx programmers is still probably larger than most other groups.

Tom L