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Shell Programming and Scripting
Regular Expressions HELP - PERL
Post 302202310 by shamrock on Wednesday 4th of June 2008 01:52:48 PM
06-04-2008
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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