As I aked Tyan, if they plan to support the K6+ - CPUs in Trinity 100 AT I got the following answer:
"We are not as of now, but if we get enough calls about it then you will
definitely see a BIOS update for it."
So everebody, mail to tyan and tell them that you wish the Support for the K6+ CPUs!! E. g. to Tech4@tyan.com or an TechSupport2@tyan.com.
I have succesfull runnig the patched Version of J.Steunebrink, but an original BIOS would be better I think. Perhaps we get some other new features with an Update...
I know this is an old post but I just found it so I will reply. Although Tyan does not "officially" support the K62+ or K63+ I can tell you from personal experiences that they do in fact work on tyan boards. I am using a K63+ 450 overclocked to 600 (6x100=600) at 2.1 vcore with no problems at all. This is on a Tyan 1598S which is just the ATX version of the sam board you have. The bios recognizes my cpu as a regular K63 rather than a K63+ but that doesn't seem to make any difference.
See the following link to the review of my experience that I posted back in November. Make sure to read my updated version of the review at the end. That is where I was able to reach 600Mhz.