# Re: please advise: Mustek 12000SP, NCR810 & color stripes

From: FJA van Zijp (ferencj@xs4all.nl)
Date: Mon Jan 22 2001 - 13:49:45 PST

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  > > I know. I pulled them both, the SC200 has a 53C810A chip and the
  > > brandless one has a 53C810AE chip. Unlike the Asus, the last one
  > > does not have a jumper to terminate the bus - I hope it does auto-
  > > termination. But whatever it does, it works for the Mustek.
  > *My* brand-less 810 SCSI controller card, which according to
  > /proc/scsi/ncr53c8xx/0 is a:
  > Chip NCR53C810, device id 0x1, revision id 0x2

  Well, over here /proc claims the same thing. But I meant to say I looked at the
  ICs themselves, and they are labeled as described. BTW, Symbios doesn't
  mention an 810AE on it's site but 825AE does exist, see
  http://www.lsilogic.com/techlib/techdocs/storage_stand_prod/index.html
  (From LSI:) compared to the 825A, the 825AE differs little, it has certain
  Microsoft PC 97 enhancements for power management support.
  I assume the same goes for the 810A and 810AE.

  > My (Relisys) Scanner has fixed passive
  > termination behind it's nonstandard 25 pin SCSI socket.

  Despite it's willingness to resume it's normal duties, I opened up the scanner
  casing. Could not find a hint of termination in mij Mustek ScanExpress
  12000SE, but that's me being blind to electronics. I'd like to remove the PCB
  to scan it, but... :-D
  Let me state again that an active terminator on my Mustek wreaks havoc on
  scanned images - which contradicts the Mustek backend homepage, but I
  speak for my scanner only.

  > does *not* do any sort of auto termination (I don't believe that any
  > 810 *does*, but don't quote me).

  I think I read somewhere that certain ICs exist which implement active
  termination. These chips can be used by manufacturers in SCSI devices.
  Maybe there are auto-terminating chips too?

  > May I recommend the "SCSI FAQ" and the no longer maintained
  > "Linux SCSI HOWTO" as two valuable sources of information
  > about SCSI in practice.

  Very recommendable sources of information, but they say little on how [fill in
  your favorite scanner-brand here] implemented SCSI. I for one have never
  been able to attach my Mustek to a SCSI chain with more than just a SCSI
  adapter. And I have tried a few adapters and devices.
  YMMV of course.

  cheers

  Ferenc

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