Texas Instruments 486SXL2-66 reference guide needed

[feipoa]

Does anyone have a reference guide or datasheet for the TI 486SXL2-66 in QFP144 or PGA168 format?

There is this large document, https://archive.org/details/bitsavers_tiTI486199XLMicroprocessorsReferenceGuide_19799789

However, it does not specifically mention the 66 MHz part; only up to 50 MHz. Other than the 66 MHz parts running at 3.6 V as opposed to 5 V, and there being a FLT#, and an integrated hardware circuit for invalidating the L1 cache, I am wondering if there are any other differences.

I have wired up a PGA168 to PGA132 prototype which I cannot seem to get working and am at the point in troubleshooting where I think there may be some small functional or pin difference with the 66 MHz, 3.6 V part. For further information on this prototype, you can view these two links (with photos).

http://www.vogons.org/viewtopic.php?f=46&t=54953
http://www.vcfed.org/forum/showthread.php?58780-How-to-troubleshoot-a-486SXL2-upgrade-CPU-with-an-oscilliscope&p=470165

If you have any other idea as to what might be wrong, please let me know.