MSCP SCSI controller speed on UNIBUS

[Don North]

9000 VAX wrote:

>On 11/8/05, Tim  Shoppa <tshoppa at wmata.com> wrote:
>  
>
>>>From a post I made to the PDP-11 newsgroups in the previous millenium: ...
>>Here are the peak data rates measured for read and write 64 blocks-at-a-time:
>>
>>                  Read           Write
>>                 ----------     ----------
>>Andromeda SCDC    2.298 MB/s     1.131 MB/s
>>CMD CQD440        2.397 MB/s     1.525 MB/s
>>CMD CQD220        1.418 MB/s     0.882 MB/s
>>CMD CQD220A       2.088 MB/s     1.409 MB/s
>>DEC RQZX1         1.379 MB/s     1.097 MB/s
>>Viking QDT        0.846 MB/s     0.704 MB/s
>>DEC RQDX3         0.164 MB/s     0.161 MB/s
>>    
>>
And for yucks on a UNIBUS 11/44 running 2.11BSD dd bs=16384 count=1000:

>>EMULEX UC-18      0.585 MB/s     not tested     target is ST32550N
>>                  0.245 MB/s     not tested     targer is RRD43 CDROM
>>    
>>