Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS

From	D Finnigan <dog_cow@macgui.com>
Newsgroups	comp.sys.apple2
Subject	Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS
Date	2016-01-11 19:34 +0000
Organization	Mac GUI
Message-ID	<dog_cow-1452541055@macgui.com> (permalink)
References	<9e054763-c065-493a-8b57-1bc7abe93cd7@googlegroups.com> <46906959-64b1-4902-b07c-830823c7a538@googlegroups.com>

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fadden wrote:
> On Sunday, January 10, 2016 at 9:59:57 PM UTC-8, awanderin wrote:
>> [...]
>> >> FWIW, you can find the CiderPress implementation of 6&2 and 5&3
>> >> encoding here:
>> >> https://github.com/fadden/ciderpress/blob/master/diskimg/Nibble.cpp
>> >
>> > Thank you!  I see that you wrote it for both 6x2 and 5x3.  Not to
>> > sound helpless, but I really don't know how to implement this program.
>> > Obviously it's a language, I presume Basic.  Step by step, how can I
>> > make this run?
> 
> http://a2ciderpress.com/
> 
> The code is written in C++.
> 
> FWIW, if you:
>  - set Edit > Preferences > Disk Images > Confirm disk image format
>  - open a DOS 3.2 disk image (.nib) with Tools > Disk sector viewer
> 
> you can choose to view each track as sectors or nibbles.  Might be handy
> for seeing both forms of each track.
> 
> 
>> Do you have the book, Beneath Apple DOS?  It's available on-line as a
>> PDF and it describes the 5&3 decoding in sufficient detail that you
>> should be able to implement in Excel.  You figured out 6&2 so 5&3 is
>> really conceptually the same but the details differ.
> 
> FWIW, I vaguely recall disassembling the DOS 3.2 RWTS code to figure out
> 5&3 encoding, because the Beneath Apple DOS explanation was insufficient,
> and I wasn't able to locate a working implementation (back in 2003).
>

OpenEmulator also has a decoder for DOS 3.2's 5&3 encoding. And DOS 3.3 too.

https://code.google.com/p/openemulator/source/browse/trunk/libdiskimage/DIApple525DiskStorage.cpp

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Thread

DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-09 21:24 -0800
  Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS fadden <thefadden@gmail.com> - 2016-01-09 21:58 -0800
    Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-10 10:15 -0800
      Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS awanderin <awanderin@gmail.com> - 2016-01-10 23:00 -0700
        Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-10 23:56 -0800
          Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS awanderin <awanderin@gmail.com> - 2016-01-13 23:12 -0700
            Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-15 23:21 -0800
              Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-16 00:02 -0800
              Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS awanderin <awanderin@gmail.com> - 2016-01-17 00:00 -0700
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-17 09:55 -0600
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS awanderin <awanderin@gmail.com> - 2016-01-17 23:29 -0700
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-18 07:08 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-18 10:56 -0600
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-19 01:13 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS awanderin <awanderin@gmail.com> - 2016-01-19 22:58 -0700
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-18 07:05 -0800
        Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS fadden <thefadden@gmail.com> - 2016-01-11 09:30 -0800
          Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS D Finnigan <dog_cow@macgui.com> - 2016-01-11 19:34 +0000
            Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS scott@alfter.diespammersdie.us (Scott Alfter) - 2016-01-11 21:18 +0000
              Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-11 21:33 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS gids.rs@sasktel.net - 2016-01-12 09:30 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-13 20:48 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-14 16:36 -0600
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Denis Molony <denisbytezone@gmail.com> - 2016-01-15 20:09 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS "Michael 'AppleWin Debugger Dev'" <michael.pohoreski@gmail.com> - 2016-01-18 10:06 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Denis Molony <denisbytezone@gmail.com> - 2016-01-18 11:14 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS "Michael 'AppleWin Debugger Dev'" <michael.pohoreski@gmail.com> - 2016-01-19 23:09 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-15 23:29 -0800
                Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS ultramagnus_tcv <mikew@thecomputervalet.com> - 2016-01-16 14:15 -0600
              Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Raymond Wiker <rwiker@gmail.com> - 2016-01-12 21:47 +0100
  Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS "Michael 'AppleWin Debugger Dev'" <michael.pohoreski@gmail.com> - 2016-01-10 07:56 -0800
    Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS Frank Schnorbus <fandr76@aol.com> - 2016-01-10 10:22 -0800

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