Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!mit-eddie!husc6!rice!sun-spots-request From: nesheim@think.com (Bill Nesheim) Newsgroups: comp.sys.sun Subject: What won't a Sun 4/110 VME do? Keywords: Hardware Message-ID: <278@brazos.Rice.edu> Date: 18 Jul 89 13:42:29 GMT Sender: root@rice.edu Organization: Sun-Spots Lines: 26 Approved: Sun-Spots@rice.edu X-Sun-Spots-Digest: Volume 8, Issue 77, message 15 of 21 | Date: Wed, 5 Jul 89 17:52:24 BST | From: Chris Brown | 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@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@think.com, {ames,bloom-beacon,mit-eddie}!think!nesheim