TABLE 46 - FDC PARALLEL PORT PINS
SPP MODE PIN DIRECTION
FDC MODE
PIN DIRECTION
nSTROBE
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
(nDS0)
I/(O) Note1
PD0
nINDEX
nTRK0
nWP
I
PD1
I
PD2
I
PD3
nRDATA
nDSKCHG
-
I
PD4
I
PD5
-
PD6
(nMTR0)
-
I/(O) Note1
PD7
-
nACK
BUSY
PE
nDS1
O
O
O
O
O
O
O
O
I
nMTR1
nWDATA
nWGATE
DRVDEN0
nHDSEL
nDIR
I
SLCT
nALF
nERROR
nINIT
nSLCTIN
I
I/O
I
I/O
I/O
nSTEP
Note 1: These pins are outputs in mode PPFD2, inputs in mode PPFD1.
Refer to Force Write Protect in the Floppy Disk Controller section for information on the Floppy disk
Controller Force Write Protect function.
108