INT 66 - TI Professional PCIBM PC - SYSTEM INFORMATION (NOT A VECTOR!) 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 #03517) SeeAlso: INT 60"TI Professional PCIBM PC",INT 67"TI Professional" Bitfields for TI Professional drive type information: Bit(s) Description (Table 03517) 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