Int 66  - Ti Professional Pc - System Information (not A Vector!)          [b]

Desc:  the low word of this vector contains the system memory size in
     paragraphs; the third byte contains the number of outstanding
     interrupt requests, and the fourth byte contains a description
     of the installed drive types (see #3188)

See Also: INT 60"TI Professional PC",INT 67"TI Professional"

Bitfields for TI Professional drive type information:
Bit(s) Description (Table 3188)
 7 floppy drive D: has 80 tracks
 6 floppy drive D: is double-sided
 5 floppy drive C: has 80 tracks
 4 floppy drive C: is double-sided
 3 floppy drive B: has 80 tracks
 2 floppy drive B: is double-sided
 1 floppy drive A: has 80 tracks
 0 floppy drive A: is double-sided