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- Path: sparky!uunet!optilink!brad
- From: brad@optilink.COM (Brad Yearwood)
- Newsgroups: comp.sys.sun.hardware
- Subject: Re: Old Sun question - HELP!!!!!
- Message-ID: <13852@optilink.COM>
- Date: 11 Jan 93 03:26:09 GMT
- References: <rcaldwel.726296968@ponder> <1993Jan6.115253.19572@elroy.jpl.nasa.gov> <C0JoJ6.LG6@zoo.toronto.edu>
- Organization: Optilink Corporation, Petaluma, CA
- Lines: 26
-
- In article <C0JoJ6.LG6@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer) writes:
- > In article <DERAADT.93Jan7120536@newt.newt.cuc.ab.ca> deraadt@newt.cuc.ab.ca (Theo de Raadt) writes:
- > >Why the heck did Sun not put better serial chips in their new machines??
- > >Isn't it obvious by now that the Zilog chips SUCK?
- >
- > Probably because Sun no longer has any competent device-driver writers...
-
- How competent can a device-driver writer be if their job is to stick themselves
- between a rock (interrupt-per-character serial chip) and a hard place (long
- interrupt latency, expensive context switches, complex environment)?
-
- The real problem is that most serial chips are still late 1970's creatures,
- designed to work with 8-bit microprocessors in bottom-dollar applications.
-
- If the bloody things had some decent buffer ring management in them (Cirrus
- Logic has some multi-serial chips which do), then they could be made to work
- nearly as well as Ethernet controllers do. Except of course for the fact
- that most serial interfaced devices are cheap and un-designed junk, so people
- expect feats of miraculous intuition in flow control to keep them from
- overrunning each other.
-
- Ethernet: the only decent low-speed serial interface. Give a design you love
- an Ethernet port today.
-
- Brad Yearwood brad@optilink.com {uunet, pyramid}!optilink!brad
- Petaluma, CA
-