Xform_Run ($F65D)

Xform_Run_a ($F65B)

These two routines generate a run value, using the run index pair in $C837-$C838. For Xform_Run_a the scalar value is passed in the A register, while for Xform_Run, the scalar value must already be in $C83B. The transformed value is return in the A register.

ENTRY:

DP = $C8

A-reg = length for rise/run (Xform_Rise_a only)

EXIT:

A-reg = run value

B-reg trashed

Source