[Coco] Easy way to copy 40 track disks to the CoCoSDC?

[Arthur Flexser]

Looks like that attempts to copy RAM to ROM rather than vice versa.  ($FFDE
and $FFDF should be swapped.)

Art

On Sat, Apr 25, 2015 at 4:23 PM, Bill Pierce via Coco <coco at maltedmedia.com>
wrote:

> The rom 2 ram program is easy...
>
> START LDX #$8000
> LOOP CLR $FFDF
>  LDD ,X
>  CLR $FFDE
>  STD ,X++
>  CMPX #$FFEF
>  BLS LOOP
>  RTS
>  END
>
>
> Syntax may be a litte of (been a long time since I worked in EDTASM), but
> the flow is correct.
> At that point, rom is in ram and can be modified.
> To turn roms back on from basic, just:
> POKE&HFFDF,0
>
>
>
>
> Bill Pierce
> "Today is a good day... I woke up" - Ritchie Havens
>
>
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Contributor, Co-Editor for CocoPedia
> http://www.cocopedia.com/wiki/index.php/Main_Page
> E-Mail: ooogalapasooo at aol.com
>
>
>
>
>
>
> -----Original Message-----
> From: Gene Heskett <gheskett at wdtv.com>
> To: coco <coco at maltedmedia.com>
> Sent: Sat, Apr 25, 2015 2:06 pm
> Subject: Re: [Coco] Easy way to copy 40 track disks to the CoCoSDC?
>
>
> On Saturday 25 April 2015 13:39:03 Daniel Campos wrote:
> > Hi Tim,
> >
> > I tried
> that on my CoCo1 but the poke didn't work. It works only in a
> > CoCo3 ?
>
> It
> should work on a 1 or 2 with a full 64k of memory in them but doing
> the rom2ram
> (ISTR thats the name of the utility anyway) first and then
> doing the poke to a
> ram location, s/b the same address at $D29D, but now
> its writeable ram instead
> of fixed eprom.
>
> ISTR there was something in rsbasic that flips that bit back to
> eprom, I
> think if you hit the reset button.  But my memory for 30 year old
> stuff
> could be mistaken too.
>
> I was fond of Jake Commanders CHRMAKEY, which
> loaded a full screen basic
> editor that used the shifted hotkey to write the
> whole basic keyword in
> one keystroke, but he loaded it to the top of the lower
> 32k ISTR, and I
> moved it to above the diskbasic eprom by doing the rom2ram
> thing first,
> saving around 2k of basics ram.  There was also a patch it needed
> for
> coco2's as they had moved the keyboard scan routine, and Jake was using
>
> the 1.0 version direct instead of the indirect jump for it in the first
> few
> bytes of the $A000 address space like Tandy says was the right way.
> But I
> don't think the patched version ever made it to one of our net
> holding places
> like RTSI as all this took place in 300 baud modem days.
>
> If I ever run across a
> copy on disk, I'll see if I can get it uploaded,
> but I'd almost bet the farm I
> had it on cassette.  And you know how kids
> are when they need a cassette.  "But
> daddy, all it had on it was some
> noise!" Sigh.
>
> > Daniel
> >
> > On 25/04/2015
> 13:50, tim lindner wrote:
> > > On Sat, Apr 25, 2015 at 9:28 AM, Daniel Campos
>
> <daniel.campus at gmail.com> wrote:
> > >> Hello,
> > >>
> > >> I'm continuing on my
> efforts to recover the remaining disks, but
> > >> some of them are 40 track disks
> and I think the BACKUP command on
> > >> the SDC-DOS is not recognizing the
> sources as 40 tracks. There is
> > >> some way to easily copy them to a .SDF file
> ?
> > >
> > > On a CoCo 3 address 53917 ($D29D) should be 35 ($23). This is where
> >
> > the BACKUP command gets the maximum track number. If you POKE 40
> > > ($28) in
> that location BACKUP should go all the way to track 40.
> > > I've not tested
> this, so let us all know how it goes. :)
> > >
> > > If the disk is a normal 18 256
> byte sectors per track, then there is
> > > no reason to use a .SDF file. A .DSK
> file will be sufficient. Also
> > > if the disk is not a normal 18 256 byte
> sectors per track, BACKUP
> > > wouldn't work anyway.
>
> Cheers, Gene Heskett
> --
>
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury,
> and ammo. Please use in that order."
> -Ed Howdershelt (Author)
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> <http://geneslinuxbox.net:6309/gene>
>
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