[COFF] SCO UNIX 3.2V4.2 and kernel trap on 'fast' pentium

Around 1997 I and others had a problem with SCO UNIX 3.2V.4.2 on 'faster' Pentium CPUs. Faster defined as probably 200MHz or more. There were at least two patches as far as I remember and maybe SLS uod464a. I didn't look at that time but now I'm wondering if other Unixes had similar problems. Either commercial versions or free ones. Anyone here who encountered such problems on other Unixes? One patch had "This is due to executing an invalid instruction in kernel mode (trap 6 is for an invalid instruction; a user process which does this will simply die with a core dump). If your particular problem is a double panic and it doesn't leave a system memory dump in whatever device you've chosen for dumps (usually /dev/swap), apply the following patch. This is due to a problem in the kernel's querytlb() routine, which may allow the Pentium to execute a 386-specific instruction which is not supported on the Pentium. The cure involves patching a kernel module using _fst. (see part 1 on where to find /etc/_fst). Go into the /etc/conf/pack.d/kernel directory. We're going to work on locore.o, so make a backup and then run _fst -w locore.o - The conversation between you and _fst goes like this (the * is a prompt from _fst; don't type it or any of _fst's responses):" https://scofaq.aplawrence.com/FAQ_scotec3ktrap6.html A second one was "> Follow the additional instructions below ONLY if you now get Cheers, uncle rubl