Z4648252@SFAUSTIN.BITNET (Z4648252) (11/16/89)
Vance Chin of Berkeley Micro Systems writes:
"Larry,
Since there was all this discusion one the net about what rev to
have on the Seagate ST-296N we decided to buy one. the results are:
When Segate upgraded the "rom rev" of the ST-296N to "REV 8" they
also changed the timing of the SCSI bus. This had the affect of requiring
a faster handshake for each byte. So, if the host board you are using delays
the signal to long it will have to wait for the next transfer phase. This in
turn takes longer to transfer the data block from the drive. On our host board
we used a 1:1 interleave to achieve the maximum data rate with no problems on
a Seagate ST296N rev 8 drive.
This is why Seagate is bemused when you call them up and say " The drive
won't work 1:1 on my system". Seagates tester runs them at 1:1 interleave
inhouse to test them faster.
Vance Chin
Berkeley Microsystems"
------------------
Vance,
Thanks for the information about the 296n transfer rate. My only
question at this point is why the SeaGate is the only one with this
difficulty with the various host adaptors?
I'd be willing to buy the Berkeley host adaptor if I knew for sure
that I could get 1:1 to work.
As usual, many thanks... you have always been helpful on the information
department.
Larry Rymal: |East Texas Atari 68NNNers| <Z4648252@SFAUSTIN.BITNET>