forum home page
register faq member list calendar search
MacShock.com - Apple Forums
Reload this Page
Old 01-01-2012, 01:40 AM
Steve Nickolas
Guest
 
Posts: n/a
Default Packing and crunching DOS 3.3

OK, this is a weird idea I came up with and don't know how to implement.
:P

This is an Exomized image of my DOS 3.3 variant:
http://xtra.usotsuki.info/pakastos.zip

Inside the .ZIP there is a file with a short (12 bytes, I think) BASIC
stub that loads at $0801. (No doubt it'll need relocated, or a wrapper
that loads it from a different address, since boot sectors load at
$0800-$08FF - I know this much.)

I don't know much about the disk ][ firmware or hardware, but I figured...

The file size is 6788 bytes - 0x1A84. so it takes $1B (27) sectors. As
long as the bootstrap takes less than 5, that's a win - the disk will
still take less space than a disk normally formatted with this system.
(Yes - a normally formatted disk with this variant has only 2 system
tracks, not 3 as in standard DOS 3.3. The hack comes from AAL.)

So, I'm thinking I want to do a reasonably snappy load of this image into
memory, then jump over the stub to decompress DOS.

Also - I'm thinking of adding options that can load additional tracks to
show an image on the screen, or to forceload BASIC, etc., and a tool to
ease with the formatting of such disks?

-uso.
  Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump


All times are GMT. The time now is 01:34 PM.
Copyright ©2007-2008 MacShock.com. Powered by vBulletin
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.