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

[Kip Koon]

Hi Juan,
Do you have the information on the Yamaha V9958 VDG chip and it's registers' address locations?

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 2:09 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.
> 
> Ah, if anybody downloaded it before reading this, download it again. I changed HSET MEM COPY to be faster.
> 
> Juan Castro
> Enviado do meu Olivetti Programma 101
> 
> 
> On Wed, Apr 8, 2015 at 2:40 AM, Juan Castro <jccyc1965 at gmail.com> wrote:
> > 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-proposa
> > l.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
> >>>
> >>> --
> >>> Coco mailing list
> >>> Coco at maltedmedia.com
> >>> https://pairlist5.pair.net/mailman/listinfo/coco
> >>
> >> --
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