Tomasz Biela

p = $20ff lda #proc sta p+1 jmp (p) -> Buggy indirect jump i see, you alloc pointers only on "zero page" with limit, probably this is explanation

3 cycles ? really ?

after changing the assembly address of the .PROC, .LOCAL block, it is not possible to use the .DS directive mads.pas, listing line: 10969

The value $120 is not random, for other values there may be an endless loop, it depends on the complexity of the example