fast bootable Read Track/Sector routine.
- targets single-loaders in either ProDOS or DOS (v3 only) order
- load from any slot
- scatter-reads sectors
- full-track read in one revolution
- can read tracks to non-sequential addresses (v3 only)
- runs entirely from zpage
- can load up to 11 complete tracks
- can load up to 12 additional sectors ($0400-bfff)
- DOS 3.3 Launcher compatible (v2 only)
- supports pre- and post-read routines
- requires only 3 pages in memory