Compile-time calculation: Difference between revisions

The ca65 cross-assembler supports computing and storing double-word (32-bit) integer values; unfortunately most 86502-bitbased systems have no built-in support for manipulating such values. But the assembler also supports converting them directly to strings, which are easily printed at runtime. So, here's a straightforward implementation. As written, it works for any Commodore port:8-bits, but it could be ported to a different 6502 machine just by changing the print loop to use the appropriate output routine for the target system.

.error "Target must be a Commodore 8-bitsystem."

The code should work on any Commodore 8-bit computer, from the original PET through the C-128. Here's what it looks like when run immediately upon booting a C-64: