== Notes ==
* AMSDOS supports only single-sided disks (the FDC supports two sides, but AMSDOS doesn't). All other DOS clones like VDOS, RODOS, ROMDOS, PARADOS, X[[XD-DDOS DOS]] support double-sided disks. However, unknown if/how some/all/which of that clones allow to access the 2nd side via above functions (possibly/best by unused bits in the drive number, or by extending track number to 0..159 for 2x80 tracks)?
* The above chr(8xh) function vectors are usually at ROM7:C033h..C04Dh in AMSDOS, however, clones like VDOS, RODOS, ROMDOS, X-DDOS have the vectors arranged differently, so always use KL_FIND_COMMAND to obtain the function address.