a72@mindlink.UUCP (Raman Anand) (07/04/90)
I have a baby 286 12Mhz motherboard. I would like to know if its okay to install an AMD 80C287 math co-processor in it. Has anybody done this? Raman ******************************************************************** * "I believe in a God which doesn't need heavy financing.", Fletch * * Ramanjeet Singh Anand * * CIS: 73767,2161 VANCOUVER * * USENET: a72@mindlink.uucp BEAUTIFUL BRITISH COLUMBIA * ********************************************************************
kislik@boole.seas.ucla.edu (Maxim Kislik/;093090) (07/06/90)
I remember that some 386s can handle a 287 as a co-processor. How can I tell whether I can or cannot do this? Max.
phil@brahms.amd.com (Phil Ngai) (07/06/90)
In article <2347@mindlink.UUCP> a72@mindlink.UUCP (Raman Anand) writes: | |I have a baby 286 12Mhz motherboard. I would like to know if its okay to |install an AMD 80C287 math co-processor in it. Has anybody done this? Speaking of the Am80C287, there seems to be some misunderstanding about the extent of the product offering. The product is being advertised in the US. I don't think AMD is ready to go international with this yet. Readers outside the US should probably wait until they see advertisments with availability information. Discussions on USENET do not constitute an advertisment or an official offer of availability. Mr. Anand, you seem to be in Canada so I don't know exactly where that leaves you. Why don't you try the 800 number and see if the call goes through. I believe the 287 gets a clock 2/3 of the 286, so a 10 Mhz 287 should work just fine. Of course, I do not speak for the company. -- -- Phil Ngai, phil@amd.com {uunet,decwrl,ucbvax}!amdcad!phil PALASM 90: it's not the same old PALASM any more!
grege@gold.GVG.TEK.COM (Greg Ebert) (07/06/90)
In article <837@lee.SEAS.UCLA.EDU> kislik@boole.seas.ucla.edu (Maxim Kislik/;093090) writes: >I remember that some 386s can handle a 287 as a co-processor. >How can I tell whether I can or cannot do this? > According to my Intel databook, an 80287 is a 40-pin DIP device, and the 80387 is a pin grid array (PGA) device. So, I'd just look at the sockets. An 80387 has 2 'rows' of pins which form a square; don't confuse it with a socket for a Weitek, which is larger. When I was at AST Research, I seem to recall our first '386 system had a socket for an 80287. The 80386 has an internal mode bit which tells it to run 16-bit (80287) cycles or 32-bit (80387) coprocessor access cycles. Your setup utility MUST have some sort of selection for this.