chris@aivru.sheffield.ac.uk (Chris Brown) (07/05/89)
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)
nesheim@think.com (Bill Nesheim) (07/18/89)
| Date: Wed, 5 Jul 89 17:52:24 BST | From: Chris Brown <chris@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@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