What won't a Sun 4/110 VME do?
Bill Nesheim
nesheim at think.com
Tue Jul 18 23:42:29 AEST 1989
| Date: Wed, 5 Jul 89 17:52:24 BST
| From: Chris Brown <chris at aivru.sheffield.ac.uk>
| Some while ago my Sun salesperson told me that there was some way in which
| the VME bus on a Sun 4/110 was not a complete implementation -- something
| to do with not having a bus arbiter, I believe. I didn't take much notice
| at the time because it didn't matter, but now it does! Can anyone tell me
| *exactly* what it is that the VME bus on a 4/110 won't do?
| Also if anyone has experience of connecting a 4/110 to an external VME
| rack using a VME/VME adaptor, I'd be interested to hear from you.
| Chris Brown, A.I. Vision Research Unit, Sheffield University
| (chris at aivru.sheffield.ac.uk)
The 4/110 cpu does not have VME slave capability. This means that VME
devices cannot do DMA to the 4/110. The 4/110 can do program access of
VME bus devices just fine.
Thus you can't use things like VMEbus disk controllers in the 4/110, while
framebuffers and framegrabbers are in general OK.
Bill Nesheim
Thinking Machines Corporation
245 First St, Cambridge, MA 02142
617-876-1111, FAX 617-876-1823
nesheim at think.com, {ames,bloom-beacon,mit-eddie}!think!nesheim
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