Re: Another DOS oddity...

From: Spiro Trikaliotis <*ml-cbmhackers_at_trikaliotis.net*> Date: Sun, 26 May 2013 20:59:16 +0200 Message-ID: <20130526185916.GF9312@trikaliotis.com> · ml-cbmhackers_at_trikaliotis.net

Hello,

* On Sun, May 26, 2013 at 02:49:42PM -0400 Greg King wrote:

> That book is wrong in many places.
> 
> For example, U1/U2 didn't replace the B-R/B-W commands.  They are in
> different categories:  U1/U2 work on disks, while B-R/B-W work
> on "files" (nameless, random-access files).

That's right, but: Nobody understands this difference. ;)

Re-reading the documentation from Commodore for the 1541, I see that
this is actually documented. But, I also see (in description for U1,
U2):

http://www.softwolves.pp.se/idoc/alternative/vc1541_de/#directaccess

        1.BEZEICHNUNG     2.BEZEICHNUNG          FUNKTION

        U1                UA                     Ersatz  für BLOCK-READ
        U2                UB                     Ersatz  für BLOCK-WRITE

(for everyone else: "Ersatz für" = German for "Replaces")

Thus, it seems the people that have written the handbook (at least, the
german variant) did not understand the difference themselves.

But, regarding the "correct" handling for B-A und B-F: Good to know. I
was not aware of that.

Regards,
Spiro

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