Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!lll-winken!sun-barr!texsun!texbell!merch!cpe!techsup!gak!root From: root@gak.UUCP Newsgroups: comp.sys.tandy Subject: Re: Tandy 4000 revisions Message-ID: <6100001@gak> Date: 25 Sep 89 04:24:00 GMT References: <886@biar.UUCP> Lines: 27 Nf-ID: #R:biar.UUCP:886:gak:6100001:000:1323 Nf-From: gak.UUCP!root Sep 24 23:24:00 1989 /* Written 6:57 pm Sep 23, 1989 by biar.UUCP!jhood in gak:comp.sys.tandy */ /* ---------- "Tandy 4000 revisions" ---------- */ I have a Tandy 4000, with a rev C1 motherboard. When I bought this machine, about a year ago, Tandy was not supporting 80387s in this machine. In the new catalog, I see that they are now. Is this because they came out with yet another motherboard or because of the D-step 386s they're getting now? Does the C1 motherboard have the fix for using '387s with the B-step CPU? On another note, what's the current BIOS revision for the T4K? --jh John Hood, Biar Games snail: 10 Spruce Lane, Ithaca NY 14850 domain: jhood@biar.uu.net bang: anywhere!uunet!biar!jhood /* End of text from gak:comp.sys.tandy */ The rev C boards are in the 25-5000A Tandy 4000s. This version should NOT have a 287 socket & will only have a functional 387 socket. D step CPUs are labeled 80387DX on the CPU. Rev C boards require a BIOS of 1.3.3 or greater. Rev A boards were only used in the Tandy 4000. Rev C & later were used in the 4000 & the 4000LX. As a note, Rev As had both sockets, but only the 287 socket properly functioned. Also, Tandy tried very hard to make the manuals match the mother boards. If you have a C board in a 25-5000A, the manual should say it will only take a 80387. Gary Kueck