> Here is the summary of TC SCSI adaptor features.
> 
> - PMAZ-A
>  DS5000/200 builtin, or TC option card
>  Slow/Narrow 5MB/s
>  SCSI transaction is done via local SRAM by PIO
> 
> - DS5000/1xx,2xx,xx builtin
>  ULTRIX sometimes calls it PMAZ-B, but hardware has no
>  such TC ID string inside.
>  SCSI transaction is done by IOASIC DMA
>  Slow/Narrow 5MB/s
>  performs moderately well
> 
> - TCDS
>  DEC3000 builtin, or available as TC option cards
> 
>  300,400,500,700		Slow/Narrow     5MB/s 
>  600,800,900		Fast/Narrow    10MB/s 
>  PMAZB			Slow/Narrow     5MB/s 
>  PMAZC			Fast/Narrow    10MB/s	

So the best choise would be a PMAZC-A then,OK!

Thank you.

Joachim Buss