[Coco] R+DOS/16 IDE support: I learned about the $052DDC offset the hard way.

[Kip Koon]

Hi Juan,
Cool Beans!!!  I'm closer to getting the PCBs done.  I have 11 RGB2VGA Converter PCBs built minus the one modification for each.  Now on to the 6 Wordpak2+ boards.  Still at the Beach!  :)  

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon



> -----Original Message-----
> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Juan Castro
> Sent: Wednesday, April 08, 2015 1:40 AM
> To: CoCoList for Color Computer Enthusiasts; Lista CoCo
> Subject: Re: [Coco] R+DOS/16 IDE support: I learned about the $052DDC offset the hard way.
> 
> It was less invasive and it was WRONG -- all file additions had been left out!
> 
> This one is much closer to being commit-worthy IMHO:
> https://dl.dropboxusercontent.com/u/15643089/hdbdos-16krom-1.5-proposal.patch
> 
> What it does that MAY still raise eyebrows:
> - Some black magic to reinsert the includes if you go to cocoroms/ and make
> - If compiling the IDE+USELBA version, I use that voodoo sector offset $052DDC, and 0 for all others
> - IDE default port address is now $FF50
> - Version has been bumped to 1.5R1
> - When compiling the 16K versions, the OS name is R+DOS/16 instead of HDB-DOS. Too much vanity?
> 
> A change in HSET MEM semantics:
> - HSET MEM COPY copies ROM to RAM, leaves RAM active
> - HSET MEM just switches to RAM, yeah, instant crash if you haven't a functioning BASIC in RAM
> - HRESET MEM switches to ROM.
> 
> Also, there's no DriveWire speed change anymore. I'll think about how to reintroduce that in a polite way.
> 
> The compiled ROMs are in the link below -- each and every one of them should be usable, with all its respective disk semantics intact,
> plus my fluff. MiniIDE users, if you feel courageous enough to alter the board's circuit to allow for a 16K ROM, feel free to dare.
> Caveat emptor. Also, I'd like DriveWire users to test if printing still works.
> 
> https://dl.dropboxusercontent.com/u/15643089/16kroms.zip
> 
> The good news? I didn't have to shorten any messages!
> 
> Juan Castro
> Enviado do meu Olivetti Programma 101
> 
> 
> On Sun, Apr 5, 2015 at 3:48 PM, Tormod Volden <lists.tormod at gmail.com> wrote:
> > Hi Juan,
> >
> > Is 052DDC some kind of standard value? In case it maybe should be
> > applied to HDB-DOS proper. Are there other common values?
> >
> > I looked through your patch and it it looks indeed less invasive than
> > what I have seen before. But what changes in this patch require going
> > to 16K?
> >
> > I am however inclined to keep HDB-DOS conservatively to 8KB and rather
> > let people explore Brett's new DOS for everything that one can do with
> > 16KB.
> >
> > Regards,
> > Tormod
> >
> >
> >
> >
> > On Sun, Apr 5, 2015 at 2:09 AM, Juan Castro <jccyc1965 at gmail.com> wrote:
> >> I tried to use a compiled-from-sources 16 KB LBA HDB-DOS ROM with my
> >> BASIC goodies in my MiniIDE, and got nothing. Then I remembered about
> >> the FF70 port thing, changed it to FF50 -- nopw I got gibberish from
> >> the disk instead of a lockup.
> >>
> >> I backtracked EVERY change in the ROM, one by one. At some point I
> >> even thought the recent TFSIDE patch was the culprit. After taking
> >> everything out (and burning some 20 EPROMs in the process). After
> >> much disappointment, I got to a difference of 3 bytes between my
> >> compiled ROM and the one that worked.
> >>
> >> Those bytes were 00 00 00 in my ROM, and 05 2D DC in the working ROM
> >> that came with the MiniIDE. Yeah. Hard-coded sector offset.
> >>
> >> Now I FINALLY have a 16K HDB-DOS derivative for the CoCo 1/2 with the
> >> BASIC enhancements I had before (except DW support) working on an IDE
> >> interface. It should work in a Glenside IDE or a SuperIDE if you can
> >> coax the hardware into seeing a 16K Disk ROM. Here's it:
> >>
> >> https://dl.dropboxusercontent.com/u/15643089/16k-hdblba.rom
> >>
> >> And below is the source patch. On its face, it's a less invasive
> >> patch
> >> -- it just creates 16k ROMs and leaves disk support as-is. I imagine
> >> ROM 16k-xxxxxx.rom should work pretty much as well as the plain 8k
> >> xxxxxx.rom, for every xxxxxx.
> >>
> >> https://dl.dropboxusercontent.com/u/15643089/16k-ide-rom.patch
> >>
> >> Next challenge is to reintroduce DW support into an IDE ROM as an
> >> add-on. That will be tricky, but, I imagine, less than introducing
> >> IDE support into a DW ROM.
> >>
> >> Also, I didn't hack my MiniIDE; I used an MPI.
> >>
> >> Juan Castro
> >> Enviado do meu Olivetti Programma 101
> >>
> >> --
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> >> Coco at maltedmedia.com
> >> https://pairlist5.pair.net/mailman/listinfo/coco
> >
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