TABLE 47 - FDC PARALLEL PORT PINS
SPP MODE PIN DIRECTION FDC MODE PIN DIRECTION
nSTROBE
I/O
(nDS0)
I/(O) Note1
PD0
I/O
nINDEX
I
PD1
I/O
nTRK0
I
PD2
I/O
nWP
I
PD3
I/O
nRDATA
I
PD4
I/O
nDSKCHG
I
PD5
I/O
-
-
PD6
I/O
(nMTR0)
I/(O) Note1
PD7
I/O
-
-
nACK
I
nDS1
O
BUSY
I
nMTR1
O
PE
I
nWDATA
O
SLCT
I
nWGATE
O
nALF
I/O
DRVDEN0
O
nERROR
I
nHDSEL
O
nINIT
I/O
nDIR
O
nSLCTIN
I/O
nSTEP
O
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.
110