Groups > comp.sys.apple2.programmer > #1977

RWTS return codes

Newsgroups	comp.sys.apple2.programmer
Date	2015-11-24 09:59 -0800
Message-ID	<ea18cb22-dd31-4ef1-a592-751221e7a5e9@googlegroups.com> (permalink)
Subject	RWTS return codes
From	Mark Lemmert <mark.lemmert@gmail.com>

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Is anyone familiar with RWTS return codes? Any suggestions that anyone may have on the issue described below are much appreciated. 


I am working on developing a routine for writing and reading data to/from floppy disk via an interface to RWTS. 

So far the routine works great. The only issue is I am noticing that I often get return codes in IOB table byte $0D that I do not recognize: for example, 

$01.....I often get this code when using a write command code
$09.....I often get this code when reading track 0, sector 0. 
$D3..I got this code when trying to read a copy II plus disk.

In all these cases the read/write appears to have been successful.  



So far the only information I have found on RWTS return codes is in the book Beneath DOS (section 6-5), which lists the following

$00 = no erros
$08 = error during init
$10 = write protect error
$20 = volume mismatch error
$40 = drive error
$80 = read error (obsolete)


My theory is that the above are no the only return codes, they are just the return codes that indicate a serious error. 

I am tempted to design my error handling routine to break if the return code is on the above list, but otherwise ignore the return code and continue.

Does anyone know if it is "safe" to ignore return codes other than the above list? If not, I am wondering that the other return codes are for?

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Thread

RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-24 09:59 -0800
  Re: RWTS return codes qkumba <peter.ferrie@gmail.com> - 2015-11-24 14:41 -0800
    Re: RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-26 08:08 -0800
  Re: RWTS return codes gids.rs@sasktel.net - 2015-11-26 07:36 -0800
    Re: RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-26 08:15 -0800
      Re: RWTS return codes qkumba <peter.ferrie@gmail.com> - 2015-11-26 08:53 -0800
      Re: RWTS return codes gids.rs@sasktel.net - 2015-11-26 11:17 -0800
        Re: RWTS return codes Antoine Vignau <antoine.vignau@laposte.net> - 2015-11-26 12:50 -0800
          Re: RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 07:34 -0800
            Re: RWTS return codes qkumba <peter.ferrie@gmail.com> - 2015-11-29 08:37 -0800
              Re: RWTS return codes qkumba <peter.ferrie@gmail.com> - 2015-11-29 08:41 -0800
              Re: RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-12-02 14:15 -0800
        Re: RWTS return codes Mark Lemmert <mark.lemmert@gmail.com> - 2015-11-29 07:20 -0800

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