[Coco] Proof-of-concept to make 16KB HDB-DOS ROMs seamlessly

[Juan Castro]

Oh, yes, indeed, the sky is the limit. But I wanted to keep the current 8K
ROM as-is, hence the scheme of checking for a signature at $E000 and
JSR'ing to $E002 only if the signature is found. I'm doing this just before
the AUTOEXEC.BAS check. Rock the boat as little as possible.


On Thu, Jan 30, 2014 at 11:48 PM, Bill Pierce <ooogalapasooo at aol.com> wrote:

>
> Juan
> I think there's a lot of room for expansion in HDBDOS if we go 16k (if
> that's what you're asking).
> Support for 35/40/80trk DSDD drives, DW4 utilites (like the /N ports in
> NOS9), DW4 printing (patched to rsdos #-2 stuff), and I have a list of
> stuff that's usefull as I was working (at one time years ago) on expanding
> RSDOS as a patch. A lot of my ideas stemmed from various patches through
> the years from Rainbow and Hot Coco that I tacked on a patch program I used
> to run any time I turned on my Coco 2. When the Coco 3 came out, they used
> up a lot of the space I was using so I dropped it and moved on to OS9 L2.
> Yes, there's a lot of things that could be done with another 8k :-)
>
>
> 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-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
> Co-Contributor, Co-Editor for CocoPedia
> http://www.cocopedia.com/wiki/index.php/Main_Page
> E-Mail: ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Juan Castro <jccyc1965 at gmail.com>
> To: CoCo List <coco at maltedmedia.com>
> Sent: Thu, Jan 30, 2014 7:44 pm
> Subject: [Coco] Proof-of-concept to make 16KB HDB-DOS ROMs seamlessly
>
>
> I replicated the "two byte ASCII signature" scheme to allow for playing
> with those unused top 8KB of ROM space. The example just puts an
> exclamation point at the top right of the screen, but you can do anything.
> Tell me what you think.
>
> I made it so, if the top 8KB don't exist, it still works as before. I had
> to condense a couple of messages. The makefile builds the normal 8K ROMs as
> before, and also the 16K roms (prefix el-).
>
> (This is a patch for the current source in Toolshed's Mercurial.)
>
> https://dl.dropboxusercontent.com/u/15643089/hdbdos-16krom.patch
>
> Juan
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>
>
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>