[Coco] OS-9 compression programs. What's available?

Robert Gault robert.gault at att.net
Fri Jul 3 08:48:22 EDT 2020

I just submitted a package to http://www.colorcomputerarchive.com/ which draws maps of the world. If 
it is accepted on the site, you can download Cartography.zip and see the contents of the world.dat 
map files.


James Jones wrote:
> A lot depends on the data files. If they're files that are already
> compressed, running a compression program on them won't help much, and
> might even make things worse. If you're talking about a program that will
> run on OS-9/6809, you'll either be constrained by memory. (CompuServe chose
> 12-bit LZW for GIF because any more bits wouldn't fit in 64K.)
> On Thu, Jul 2, 2020 at 9:34 AM Robert Gault <robert.gault at att.net> wrote:
>> I should know this but can't remember :)
>> I need a very good OS-9 compression program that can handle two data files
>> that are 559,323 and
>> 5,958,126 bytes, making them fit on a floppy image. If not that, how can I
>> transfer them to a PC
>> file where there are several good compression programs.
>> I have tried the OS-9 program AR, but that made the files larger. :(
>> The files exist on .vhd images on my PC and on similar devices like the
>> CoCoSDC on my real Coco3.
>> Wimgtool which will transfer files from floppy images to a PC,
>> unfortunately does not work with .vhd
>> images.
>> Robert
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco

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