JVC XV-521BK Service Manual page 28

XV-521BK/523GD/525BK/421BK
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Symbol I/O
NPDIAG
I/O ATAPI slave master diagnosis input
VSS
- GND
DA1 I/O ATAPI host address (Not use)
NIOCS16
O ATAPI output of selection of width of host data bus
INTRQ
O ATAPI host interruption output
VDD - Apply 3V
NDMACK
I ATAPI host DMA response (Not use)
IORDY
O ATAPI host ready output (Connect to TP157)
NIORD I ATAPI host read (Not use)
VSS
- GND
NIOWR I/O ATAPI host writes
DMARQ O ATAPI host DMA request (Connect to TP159)
Function