Some entries from the w420050811.zip readme,
PJ28355 SYS3175 (or other problems?) when booting a Pentium 4 machine when
initializing testcfg.sys or apm.sys
...
PJ28355 part 2 -- some P4 machines STILL had boot problems
...
20040330 14.098b
PJ29712 (os2ldr) final fix for boot blob hang on fast (around 3+ gHz) CPUs
...
PJ29712 redux: totally different boot blob fix. Ought to fix not only
the P4 hang, but also probably the problem on some machines of
the blob disappearing too quickly to hit alt-f1, etc.
...
JR20486 More sys3175 during bootup on Pentium 4s (and maybe Opterons?)
with >512mb of RAM
...
JR20486 (again): Even more P4-related changes. Athlon64 likely still not
working reliably (or supported).
...
200507808 14.104
Basically, a re-build of the above from an "official" build machine.
*This build is safe for Pentium Pros. Note: 486SX CPUs are (and have
always been) safe ONLY on the W4 kernel.
plus various os2ldr fixes and a few more for Pentium Pro. 14.104a I believe was the last freely available kernel from IBM.