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