21S-301HD9 133 I/O Host data bus line 9.AUX2[1] I/O Aux2 data I/O.HD10 134 I/O Host data bus line 10.AUX2[2] I/O Aux2 data I/O.HD11135I/O Host data bus line 11.AUX2[3] I/O Aux2 data I/O.IRQ O IRQ.HD12136I/O Host data bus line 12.AUX2[4] I/O Aux2 data I/O.C2PO I C2PO error correction flag from CD-ROM.HD13137I/O Host data bus line 13.AUX2[5] I/O Aux2 data I/O.SP I 16550 UART serial port input.HD14 140 I/O Host data bus line 14.AUX2[6] I/O Aux2 data I/O.HD15141I/O Host data bus line 15.AUX2[7] I/O Aux2 data I/O.IR I IR remote control input.HWRQ#142O Host write request (active-low).DCI_REQ# O DVD control interface request (active-low).AUX4[1] I/O Aux4 data I/O.HRRQ# 143 O Host read request (active-low).AUX4[0] I/O Aux4 data I/O.HIRQ144I/O Host interrupt.DCI_ERR# I/O DVD channel data error (active-low).AUX4[7] I/O Aux4 data I/O.HRST# 145 O Host reset (active-low).AUX3[5] I/O Aux3 data I/O.HIORDY 146 I Host I/O ready.AUX3[3] I/O Aux3 data I/O.HWR#149I/O Host write (active-low).DCI_CLK I/O DVD channel data clock.AUX4[5] I/O Aux4 data I/O.( )Name Pin Numbers I/O Definition