tbuf errors

[sherouse at unc.UUCP]

In article <brl-tgr.6592> rbbb at RICE.ARPA writes:
>It is still possible to get the tbuf errors with rev 7 hardware.  We have
>always had rev 7 hardware, and we have never had the writeable control
>store.  We once had lots of errors, and now we do not.  How did we fix
>this, back in the days before microcode updates?  I believe that we
>replaced the L0001 module with one that used a different brand of chips.
>This fix was discovered through a great deal of board-swapping; if anyone
>has a similar story...

Similar is not the word.  We had exactly the same experience.  The
original L0001 was *so* bad we couldn't keep the machine up long
enough to read the distribution tape!  We are now crashing about once
every two weeks with a light load.  Is it true that there is a *tested*
and available version of the micropatch loader for 4.2bsd?  And does
it really help?


George W. Sherouse
Associate Physicist
Division of Radiation Therapy
North Carolina Memorial Hospital
Chapel Hill, NC   27514

(919) 966-1101

<decvax!mcnc!unc!godot!sherouse>