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HDSEL*
INDEX*
MTR[1:0]*
RDATA*
STEP*
TR0*
WDATA*
WGATE*
WPROT*
EIDEa (ATA-2), TTL levels
IOCS16*
DMARQ
DMAK*
DIOR*
DIOW*
DASP*
IORDY
DD[15:0]
DRESET*
CS1FX*
CS3FX*
DA[2:0]
INTRQ
PDIAG*
selects top or bottom side head
indicates the beginning of a track
motor enables
read data
step head in or out
indicates that head is positioned above track 00
write data to drive
enables head write circuitry of drive
indicates a disk is write-protected
indicates a 16 bit register has been decoded
drive DMA request
drive DMA acknowledge
drive I/O read
drive I/O write
drive active/slave present
indicates drive is ready for I/O cycle(s)
drive data lines, bits 15-0
reset signal to drive
chip select drive 0, also command register block select
chip select drive 1, also command register block select
drive register and data port address lines
drive interrupt request
passed diagnostics output from drive 1 and monitored by drive 0
Connectors J4 and J5
3-15
3
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