From: buk@taz.de ($ Burkhard Kohl) Subject: Re: Adaptec 1542B vs 1542C vs 1740 Date: 21 Sep 1993 17:28:37 GMT
$ Burkhard Kohl (buk@taz.de) wrote:
: Well the 1542C supports SCSI-2 whereas the B does not. Furthermore 1542C allows
: you to enter the SCSI-select program for test and configuration purposes from
: ROM at boot time, so you don't need SCSI-select utilities :-)
: --
Sorry, but thats just wrong. Of course both adaptors are SCSI-2. Sorry again.
To prevent being flamed I'll withdraw my stupid statement
One of the main differences between B and C is the SCSI select feature which
can entered during boot time by just pressing Ctrl-A. This feature allows you to
modify the settings of the card (e.g. disabling the host bus termination,
selecting the DMA transfer rate, testing the bus, and a lot more) without
changing any jumpers and without the need of any other utility progs.
Actually the 1542C allows a slighty higher DMA transfer rate (10 Mb/s instead
of 8 Mb/s) but this feature is only of theoretical use, because the bus is
not affected - the recommend setting for most hardware combinations is still 5 Mb/s.