
W83877ATF
Publication Release Date: April 1998
- 14 -
Version 0.51
1.3 Multi-Mode Parallel Port, continued
SYMBOL
PIN
I/O
FUNCTION
PD6
16
I/O
24t
PRINTER MODE: PD6
Parallel port data bus bit 6. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
-
EXTENSION FDD MODE:This pin is a tri-state output.
IOD
24
EXTENSION. 2FDD MODE: MOA2
This pin is for Extension FDD A; its function is the same as that
of the MOA pin.
PD7
17
I/O
24t
PRINTER MODE: PD7
Parallel port data bus bit 7. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
-
EXTENSION FDD MODE: This pin is a tri-state output.
OD
24
EXTENSION 2FDD MODE: DSA2
This pin is for Extension FDD A; its function is the same as that
of the DSA pin.
1.4 FDC Interface
SYMBOL
PIN
74
I/O
IN
cs
FUNCTION
RDATA
The read data input signal from the FDD. This input pin is pulled
up internally by an approximately 1K ohm resistor. The resistor
can be disabled by bit 4 of CR6 (FIPURDWN).
DSKCHG
76
IN
cs
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by an approximately 1K ohm resistor. The resistor can
be disabled by bit 4 of CR6 (FIPURDWN).
WP
77
IN
cs
Write protected. This active low schmitt input from the disk drive
indicates that the diskette is write-protected. This input pin is
pulled up internally by an approximately 1K ohm resistor. The
resistor can be disabled by bit 4 of CR6 (FIPURDWN).
TRAK0
78
IN
cs
Track 0. This schmitt input from the disk drive is active low when
the head is positioned over the outermost track. This input pin is
pulled up internally by an approximately 1K ohm resistor. The
resistor can be disabled by bit 4 of CR6 (FIPURDWN).