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

[William Astle]

That extra 8K can still be used on the coco3, too. You just need to have 
a slightly different ROM for the coco3, one that handles the shadowing. 
You could even still run it from RAM since there's an 8K block that's 
not actually used in the 128K memory map. Then you could swap the 8K 
block in as needed.

On 14-01-30 06:48 PM, Bill Pierce 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
>
>
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>
> -----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
>
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