Unix PC maintenance

[Harvard Townsend]

Does anyone know of a source for third party maintenance on the AT&T Unix PCs,
specifically the processor board, and more specifically chip-level support?  
We have isolated a problem to a custom-made chip, VC2099, manufactured by 
VLSI Technologies.  However, neither AT&T nor Convergent will sell just the 
chip, and VLSI obviously can't due to its contract agreement.
-- 
Harvard Townsend, Systems Manager
CIS Dept., Kansas State University
CSNET:	harv at harris.cis.ksu.edu      BITNET: harv at ksuvax1.bitnet
UUCP:   {ihnp4,sdcsvax,cbatt,dcdwest}!ncr-sd!ncrwic!ksuvax1!harv