Path: utzoo!attcan!uunet!cs.utexas.edu!swrinde!ucsd!mvb.saic.com!ncr-sd!ncrlnk!ncrwic!srwic!sralston
From: sralston@srwic.UUCP (Steve Ralston)
Newsgroups: comp.unix.sysv386
Subject: Re: Whats the difference between Adaptecs (1542A/B)
Keywords: Adaptec 1542 1540 SCSI
Message-ID: <203@srwic.UUCP>
Date: 8 Jan 91 05:20:21 GMT
References: <1991Jan5.045321.1799@sp90.uucp>
Organization: Steve Ralston   Wichita, KS
Lines: 24

In article <1991Jan5.045321.1799@sp90.uucp> sanand@sp90.uucp writes:
>>  Can anyone tell me what the difference is between Adaptec's 1542A and 1542B
>>  SCSI controllers is?
>>  Kevin W. Rudd
>>  Sequent Computer Systems
>
> I am not sure of all the differences, but the major one is that "B" has
> a floppydisk controller, "A" doesn't. I run the "B" with a Maxtor, so far
> (touch wood) no problems.
> Sanand.

BzzzT, Wrong!  The Adaptec 1542B is a later rev of the 1542A; they both have
a floppy controller interface.  The 1542B is a smaller, 2/3 length board
(probably has more surface mount chips) than the 1542A full length board.
The 1540B (and 1540A) are SCSI *only* boards (no floppy controller) that
you're probably thinking of.

I believe the 154xA and 154xB are, otherwise, functionally equivalent.
Hopefully, if Roy Neese (neese@adaptex) is watching he will respond with
the technical low-down on any differences.
-- 
Steve Ralston						sralston@srwic.UUCP
235 N Zelta						voice: 316-686-2019
Wichita, KS 67206			..!uunet!ncrlnk!ncrwic!srwic!sralston