FDC37B787-NS Standard Microsystems (SMSC), FDC37B787-NS Datasheet - Page 22

• Manufacturer Part Number: FDC37B787-NS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37B787-NS

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
The Tape Drive Register (TDR) is included for
82077 software compatibility and allows the user
to assign tape support to a particular drive during
initialization. Any future references to that drive
automatically invokes tape support. The TDR
TAPE SEL1
(TDR.1)
0
0
1
1
TABLE 7 - TAPE SELECT BITS
TAPE SEL0
(TDR.0)
22
0
1
0
1
Tape Select bits TDR.[1:0] determine the tape
drive number. TABLE 7 illustrates the Tape Select
Bit encoding. Note that drive 0 is the boot device
and cannot be assigned tape support.
remaining Tape Drive Register bits TDR.[7:2] are
tristated when read. The TDR is unaffected by a
software reset.
SELECTED
DRIVE
None
1
2
3
The