82091AA Datasheet, PDF (201/204 Pages) Intel Corporation – ADVANCED INTEGRATED PERIPHERAL (AIP)

82091AA
Figure 99 Example External Decoder (Four Drive System)
290486 – A2
A 3 TDR Enhanced Tape Drive Register
I O Address
Default Value
Attribute
Size
Base ^a3h
00h
Read Write
8 bits
This register allows the user to assign tape support to a particular drive during initialization Any future refer-
ences to that drive number automatically invokes tape support A hardware reset sets all bits in this register to
0 making drive 0 not available for tape support A software reset via bit 2 of the DOR does not affect this
register Drive 0 is reserved for the floppy boot drive Bits 7 2 are only available when EREG EN^e1 other-
wise the bits are tri-stated
A-5