Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS

Newsgroups	comp.sys.apple2
Date	2016-01-09 21:58 -0800
References	<9e054763-c065-493a-8b57-1bc7abe93cd7@googlegroups.com>
Message-ID	<8fa4554d-e86b-4f60-8282-39960a6834bd@googlegroups.com> (permalink)
Subject	Re: DOS 3.2, 3.3 and ProDOS GCR in RWTS
From	fadden <thefadden@gmail.com>

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On Saturday, January 9, 2016 at 9:24:36 PM UTC-8, Frank Schnorbus wrote:
> I am not a programmer, but I have been fascinated by the scheme used to write data to the disk.  Some time ago, for the fun of it, I wrote an Excel spreadsheet that converts 256 bytes of data to the 342 (plus 1 checksum) bytes written to the disk for ProDOS.  The spreadsheet converts it back the other way also.
[...]
> Lately I thought it would be fun to write similar spreadsheets for DOS 3.2.1 (which covers back to DOS 3.1 and uses 5x3, producing 410+1 bytes), and for DOS 3.3 (which like ProDOS uses 6x2).  I think I have it done for 3.2.1, but I need to confirm my work!  I have an Apple IIc, but it is in a box, and I am so rusty on how to do something like this, especially with DOS 3.2, that it would take me weeks (or months).  Are there any experts here that might be able to help me?  I'd be so appreciative!


Interesting approach. :-)

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

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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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