Adaptec 1540A, two HDs, one tape

[Mike Squires]

In article <935 at puck.UUCP> asp at puck.UUCP (Andy Puchrik) writes:
>
>	Does the Adaptec SCSI controller support both disks and tapes?
>How many devices can it support?  Ideally, I'd like to have two disks
>and one tape driver.  What kind of performance do you get with an Archive
>Viper with a SCSI interface?
>

I am using an Adaptec 1540A controller in a Tandy 4000LX with a CDC 340MB
primary and a Micropolis 660MB secondary HD, plus a Cipher 150II SCSI tape
drive.  Disk throughput running "tar" in multiuser mode using the "monitor"
program posted to this group some time ago shows peak rates around 120KB/sec
to the Micropolis drive.  The tape drive is fast enough.  This installation
uses vanilla SCO XENIX 2.3.2 GT with 4MB DRAM on the 4000LX.

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