FDC37B78X View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

TAPE DRIVE REGISTER (TDR)

Address 3F3 READ/WRITE

TABLE 7 - TAPE SELECT BITS

TAPE SEL1

(TDR.1)

0

0

1

1

TAPE SEL0

(TDR.0)

0

1

0

1

DRIVE

SELECTED

None

1

2

3

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 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. The remaining Tape Drive Register

bits TDR.[7:2] are tristated when read. The TDR

is unaffected by a software reset.

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