MODEL 21 Hard Disk/Floppy Controller Settings and Configuration

Data bus:	16-bit, ISA
Size:	Half-length, half-height card
Hard drive supported:	Two IDE (AT) Interface drives
Floppy drives supported:	Four 360KB, 720KB, 1.2MB, 1.44MB, or 2.88MB drives

CONNECTIONS
Function	Location
34-pin control cable connector - regular/2.88MB floppy drive	J2
34-pin control cable connector - regular floppy drive	J3
5-pin connector - DC power	J5
40-pin IDE(AT) Interface connector	J6
4-pin connector - Drive active LED	J8

BIOS ADDRESS
Settings for Model 21 with Part # 1533-21-04-3 or earlier
	Address	J4/jumper 1	J4/jumper 2
	C800-C9FFh	pins 1 & 2 closed	pins 1 & 2 closed
»	D800-D9FFh	pins 2 & 3 closed	pins 1 & 2 closed
	DC00-DDFFh	pins 2 & 3 closed	pins 2 & 3 closed
	E000-E1FFh	pins 1 & 2 closed	pins 2 & 3 closed
Note: On Model 21 with Part # 1533-21-03-6 or earlier address D000-D1FFh is selected instead of E000-E1FFh.

BIOS ADDRESS
Settings for Model 21 with Part # 1533-21-06-8 or later
	Address	J4/jumper 3	J4/jumper 4
	C800-C9FFh	pins 1 & 2 closed	pins 1 & 2 closed
»	D000-D1FFh	pins 1 & 2 closed	pins 2 & 3 closed
	D800-D9FFh	pins 2 & 3 closed	pins 1 & 2 closed
	E000-E1FFh	pins 2 & 3 closed	pins 2 & 3 closed
Note: On Model 21 with Part # 1533-21-05-0 address E400-E5FFh is selected instead of E000-E1FFh.

MISCELLANEOUS TECHNICAL NOTES

On Model 21 with Part # 1533-21-06-8 or later J4/jumper 2 is factory configured to pins 2 & 3 closed - do not alter. J4/jumper 1 is not used on Model 21 with Part # 1533-21-06-8 or later. J4/jumper 3 and J4/jumper 4 are not used on Model 21 with Part # 1533-21-04-3 or earlier.