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From: sjt@sb6.UUCP
Newsgroups: net.micro.6809
Subject: Re: OS-9 and double sided disks
Message-ID: <150@sb6.UUCP>
Date: Sat, 19-Nov-83 13:25:51 EST
Article-I.D.: sb6.150
Posted: Sat Nov 19 13:25:51 1983
Date-Received: Sun, 20-Nov-83 04:23:32 EST
References: bbncca.321
Lines: 63


 Since Steve Dyer obviously did not get my previous responce on using
 debug to change modules I will post this one as a followup.
 
 After you quit the debug module you have only to SAVE the module that
 you just modified.  This will put an exact copy of the module
 "in memory" onto your current work directory.  Then uset ATTR
 and verify to update the module. The exact sequence should be:
     verify u < module to update > new updated module
     attr new updated module e pe  this sets execute and public execute
 
 After you have formatted a new disk use os9gen to build yourself a new
 boot module.  It will probably be necessary to save all modules out
 of memory and include them one at a time.  Read the book since there
 are several that you do not include in the os9boot.
 
              OS9, OS9P2, INIT, BOOT  <--- don't include

 Frank Hogg also published a letter outlining the mods to make
 in the modules of OS 9 for the COCO.  To paraphrase:
 
              change the CCDisk module and if you are
              game BOOT.

   a)  make changes below as required
         1.
            byte    #1(old value)   #2(new value)
            ====    ============    ============
            0007    81              82              Rev number
            0008    D3              D0              checksum
            01FE    13              10              speed
            10=6ms 11=12ms 12=20ms 13=30ms
            0204    22              08              delay
            0205    2E              8B                "
            0210    04              41              make drive 2 back of d 0
            0211    40              42              make d 3 back of d1
            02DD    43              40              speed
            40=6ms 41=12ms 42=20ms 43=30ms
            02E9    03              00              speed
            00=6ms 01=12ms 02=20ms 03=30ms
            0308    52              43                 crc
            0309    4C              BC                 crc
            030A    EB              6E                 crc

 If you make changes exactly as listed you SHOULD not have to do
 a verify, I do one every time since it is safer to do so.
 
        2.  save the module onto disk and then gen yourself a new
            boot( or since you did a mod to the Rev number just
            have your startup do a load newmodule each time
            you boot and this one will overlay the earlier
            version)
 
  I did modify the modules on the RS OS 9 and it does work!

  This procedure is required since the device descriptors on the
  RS are different from the real OS 9 (which is what I run since
  I do all my development on a SWTPC type system).

  I hope this is of some help as OS 9 is not easy to learn and
  is not as user friendly as it should be.

 Sidney Thompson