Since the topic of the day seems to be API CS20's. I found out that they 
are more similar to the Compaq DS20L than I first thought. Infact, they 
are virtually identical besides the SCSI controller on the PCI riser card.
I loaded the latest version of the SRM firmware (6.6.10) for the DS20L on 
mine and it works perfectly. Tru64 even identifies the onboard temp and 
voltage sensors correctly which means I don't have to disable the systems 
health daemon anymore. With the CS20 firmware it complains about a faulty 
PSU and temp sensor.

A bit more research revealed that Compaq actually made DS20L's with both 
the Adaptec SCSI controller as well as the Symbios Logic controller. Both 
types of riser cards exist for the DS20L but with different part ID's and 
the Compaq/DEC firmware for the DS20L identifies the Symbios Logic 
controller correctly. -Too bad there aren't any drivers in Tru64 for it.

The DS20L seems to be more than just inspired by the API CS20...

Cheers,
Anders