Ping: Michael Baeuerle
Dr.White
On the recent subject of forcing modern LVD SCA 80-pin drives to work with
narrow 50-pin SCSI controllers, which you kindly advised me about on 23-5-09
on this newsgroup, at a quick glance, this seems to be the sort of thing I
need (as opposed to the much cheaper and easier to find straight 80-50pin
SCA adapter):
ADP-9012 on this page:
http://www.cs-electronics.com/sca-adapt.htm
Description:
"ADP-9012
Used to convert NARROW and/or WIDE SCA 80-pin drives (-NC or -WC) to a
"normal" 50-pin NARROW bus, breaking out the 50-pin SCSI I/O, drive ID
headers, and power plug. With 18-line onboard ACTIVE termination to
terminate the narrow bus, and 9-line passive termination to terminate the
upper nine lines ("HIGH 9") of a WIDE SCA drive. Has termination
able/disable feature. 1 1/2" Form Factor."
Do you think this would do the job, i.e. allow any modern 80-pin LVD drive
to work (transfer speed not critical) on a narrow SCSI controller? Lastly, I
assume that I could still use other (narrow) SCSI devices on the same chain?
Thanks kindly for your time,
Dave.
Michael Baeuerle
>
> [...]
> ADP-9012 on this page:
> http://www.cs-electronics.com/sca-adapt.htm
>
> Description:
> "ADP-9012
> Used to convert NARROW and/or WIDE SCA 80-pin drives (-NC or -WC) to a
> "normal" 50-pin NARROW bus, breaking out the 50-pin SCSI I/O, drive ID
> headers, and power plug. With 18-line onboard ACTIVE termination to
> terminate the narrow bus, and 9-line passive termination to terminate the
> upper nine lines ("HIGH 9") of a WIDE SCA drive. Has termination
> able/disable feature. 1 1/2" Form Factor."
>
> Do you think this would do the job, i.e. allow any modern 80-pin LVD drive
> to work (transfer speed not critical) on a narrow SCSI controller?
Yes. This adapter is intended for SE disks, but if it is designed
correctly it will pull-down the DIFFSENS line and a modern
Multimode-disk automatically will switch to SE mode.
Bus length and speed:
The fastest transfer mode for SE is "Fast20", this gives you a limit of
20MByte/s on a narrow bus and a cable length limit of 3m (1.5m with more
than 4 devices). Up to 6m are possible with the slower Fast5 and
asynchronous transfer modes.
> Lastly, I
> assume that I could still use other (narrow) SCSI devices on the same chain?
Yes. But remember that a narrow host can only communicate with ID0-ID7.
The picture of ADP-9012 show an "ID3" Jumper. This jumper intended for
ID8-ID15 must always be open and is useless on this adapter (shouldn't
be present at all)!
Micha
Dr.White
"Michael Baeuerle" <michael....@gmx.net> wrote in message
news:o2qjh6...@micha.freeshell.org...
Thank you for having a look man, that's good news. I just bought ten of the
buggers, so I too may need to sacrifice a goat if the drives aren't
recognised.
Thanks,
Dave.
Dr.White
Thanks Micha, great advice all the way, all the newer 80-pin drives work
perfectly with these.
Regards,
Dave.