THROOP@GRIN1.BITNET ("Throop,Henry B") (12/20/90)
Steve Chiang writes: > Does anyone have any info on Conner mechanisms? I've heard > they have a 16k cache. Vulcans use the Conner mechanism. I don't think they have any caching built in. As far as on-drive caching goes, does this just work automatically through standard SCSI? I think I remember reading in inCider a while back that one drive they looekd at (Western Digital Preference) had a cache in the drive, but they said it only worked on a Mac, and not other SCSI interfaces, even though technically the interface should be the same. I know that inCider doesn't have a very good track record about being right about _anything_; does anyone know for sure whether this caching makes a difference? (I have a friend w/ a 40 MB Preference who says he doesn't notice any big difference between it and other drives, but hasn't done any comparisons between the same mechanisms. Incidently, I showed him a GIF of Woz I got from ummts.umich.edu a few months ago; he said he didn't need it, because he saw enough of Woz in high school. Yup. I talked with him a bit more about that; he didn't really know Woz because Woz was a class or two ahead, except that he was talking calculus or something at the local college. My friend sat in front of Steve Jobs in band; he said it was really funny because Jobs was always trying te get first chair trombone when they had chair auditions, but always played terribly and made a real fool of himself. He also knew both Peter and Alan Baum (Alan wrote the monitor w/ Woz; Peter works at AE; their father Elmer provided the funding for the Apple I), and keeps in touch with them. Homestead High School, Cupertino.) Henry -- Henry Throop THROOP@GRIN1.BITNET throoph@jacobs.cs.orst.edu
erast1@unix.cis.pitt.edu (Evan R Aussenberg) (12/20/90)
In article <9012200527.AA12531@apple.com> THROOP@GRIN1.BITNET ("Throop,Henry B") writes: >Steve Chiang writes: > >> Does anyone have any info on Conner mechanisms? I've heard >> they have a 16k cache. > >Vulcans use the Conner mechanism. I don't think they have any caching built >in. Only the 100meg Vulcans use Conner I think. And the Conner drives are voice-coil with a read-ahead buffer. The 20 and 40 meg Vulcans are mostly Seagate. (Mine is). Someone correct me if I'm wrong but SCSI doesn't really know about the read ahead buffer and doesn't care about it either. That is, it works transparently. In fact, I understand that under Prodos8 that the read ahead buffer is wonderful. >Henry >-- >Henry Throop >THROOP@GRIN1.BITNET >throoph@jacobs.cs.orst.edu Evan PS- Lots of messages from me lately. I'm on break. Also notice Henry's and my .signatures. They're SMALL, AREN'T THEY! And, they're even SHORTER THAN THE POSTS! Am i being SUBTLE ENOUGH? -- Evan Ron Aussenberg erast1@unix.cis.pitt.edu IN%"erast1@pittunix"