Path: utzoo!attcan!uunet!deimos.cis.ksu.edu!harris.cis.ksu.edu!mac
From: mac@harris.cis.ksu.edu (Myron A. Calhoun)
Newsgroups: comp.sys.cbm
Subject: Getting 1540 to work with Commodore Plus/4
Keywords: Correction
Message-ID: <0xe85@deimos.cis.ksu.edu>
Date: 27 Sep 89 18:51:04 GMT
References: <12467@orstcs.CS.ORST.EDU> <7174@max.u.washington.edu>
Sender: news@deimos.cis.ksu.edu
Reply-To: mac@harris.cis.ksu.edu (Myron A. Calhoun)
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Organization: Kansas State University, Dept of Computing & Information Sciences
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In article <7174@max.u.washington.edu> scott@max.u.washington.edu writes:
>ACKNOWLEDGEMENT: The following entry should be credited to BILL MOORE of
>                 "Library BBS", (206)641-7978, Seattle, WA, USA

>It's been a loong time, but I remember a command that should be sent to the
>1540 to slow the rate at which it comunicates with the C64 or +/4. it was
>something like:
>          Print#15,"u+" for the VIC-20 (default)
>          Print#15,"u-" for the C64 & +/4 Of course you will need to open the
>command channel first with: OPEN15,8,15 I hope this helps.

You've got the reason correct (to slow the 1540 for the C64), but I think
the - and + are reversed.  I don't have a 1540, but for the 1541 I use:
     OPEN15,8,15,"UI-":CLOSE15      for the VIC-20
     OPEN15,8,15,"UI+":CLOSE15      for the C-64

Of course the "8" can be a "9" for some drives which have had their
device numbers changed.
--Myron
--
Myron A. Calhoun, PhD EE, W0PBV, (913) 532-6350 (work), 539-4448 (home).
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