SYMBOL
nINIT
PIN
21
I/O
OD12
FUNCTION
PRINTER MODE: nINIT
Output line for the printer initialization. This pin is pulled high
internally. Refer to the description of the parallel port for the
definition of this pin in ECP and EPP mode.
OD12
EXTENSION FDD MODE: nDIR
This pin is for Extension FDD B; its function is the same as that of
the nDIR pin.
OUT12t EXTENSION ADAPTER MODE: nXDACK
This pin is the DMA acknowledge output for the Extension Adapter;
the output is sent directly from nPDACKX.
OD12
EXTENSION 2FDD MODE: nDIR2
This pin is for Extension FDD A and B; its function is the same as
that of the nDIR pin.
OUT12t JOYSTICK MODE: VDD for joystick.
nAFD
20
OD12
PRINTER MODE: nAFD
An active low output from this pin causes the printer to auto feed a
line after a line is printed. This pin is pulled high internally. Refer to
the description of the parallel port for the definition of this pin in
ECP and EPP mode.
OD12
EXTENSION FDD MODE: nRWC2
This pin is for Extension FDD B; its function is the same as that of
the nRWC pin.
OUT12t EXTENSION ADAPTER MODE: nXRD
This pin is the I/O read command for the Extension Adapter.
When the Extension Adapter base address is written to the
Extension Adapter address register, nXRD and nXWR go low
simultaneously so that the command register on the Extension
Adapter can latch the same base address.
OD12
EXTENSION 2FDD MODE: nRWC2
This pin is for Extension FDD A and B; its function is the same as
that of the nRWC pin.
OUT12t JOYSTICK MODE: VDD for joystick.
nSTB
19
OD12
PRINTER MODE: nSTB
An active low output is used to latch the parallel data into the
printer. This pin is pulled high internally. 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.
-
OUT12t EXTENSION ADAPTER MODE: nXWR
This pin is the I/O write command for the Extension Adapter. When
the Extension Adapter base address is written to the Extension
Adapter address register, nXRD and nXWR go low simultaneously
so that the command register on the Extension Adapter can latch
the same base address.
-
EXTENSION 2FDD MODE: This pin is a tri-state output.
OUT12t JOYSTICK MODE: VDD for joystick.
12
SMSC [ SMSC CORPORATION ]
