How to remove first 5000 lines from file? Post: 302355685

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LEARN ABOUT NETBSD

ioasic

IOASIC(4)						   BSD Kernel Interfaces Manual 						 IOASIC(4)

NAME

     ioasic -- baseboard IO control ASIC for DEC TURBOchannel systems

SYNOPSIS

     ioasic0 at tc? slot ? offset ?

DESCRIPTION

     The ioasic driver provides support for the DEC proprietary IOCTL ASIC found on all DEC TURBOchannel machines with MIPS (DECstation 5000
     series, excluding the 5000/200) and Alpha (3000-series) processors.  On these machines (including the 5000/200), all baseboard devices should
     be configured as children of the ioasic device.

     The ioasic provides hardware DMA channels and interrupt support for several baseboard devices, including one asc SCSI device with a scat-
     ter/gather DMA channel, an mc146818-compatible mcclock, an Am7930 audio device bba, one or two scc two-port serial devices, and a AMD 7990
     LANCE le Ethernet interface.

     The ioasic is also used for the floppy-disc drive and audio/ISDN hardware on the Personal DECstation and audio-equipped TURBOchannel Alphas,
     where the ioasic hardware provides a scatter-gather DMA channel between the 16-bit device and the 32-bit tc DMA address space.

     Support for scatter-gather DMA eliminates the need for additional copying.  A baseboard asc SCSI adaptor attached to an ioasic will give
     slightly better performance than its tc counterpart.

SEE ALSO

     asc(4), bba(4), intro(4), le(4), mcclock(4), scc(4), tc(4)

HISTORY

     The ioasic driver first appeared in NetBSD 1.1, derived from DECstation boot-time configuration code in 4.4BSD.

BUGS

     The DECstation 5000/200 does not actually have an IOASIC chip, but for consistency it must be configured as if it did.

BSD
								September 12, 1996							       BSD

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