ytmytm / c64-beamracer-subleq Goto Github PK

We need 16-bit arithmetic because pointers (addresses, vectors) need to be of the same size as values.

This is necessary to make reference programs work (self-interpreter, 99 bottles) and for simplified C http://mazonka.com/subleq/hsq.html

We have 8-bit arithmetic already. Now we only need to do it twice, with Carry flag implementation - more self-modification, more lookup tables.

https://github.com/laubzega/beamracer-saveport/blob/master/saveport.s

Cost:

• sacrifice whole bank 1

Benefits:

• save 2 bytes (25%) for every SUBLEQ instruction
• binary compatibility with existing SUBLEQ implementations (triplets)