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

Wed Apr 8 01:57:23 EDT 2015

Well, you know, what if there was a version of R+DOS/16 with Wordpak2+
support? Mmmm.

Juan Castro
Enviado do meu Olivetti Programma 101

On Wed, Apr 8, 2015 at 3:55 AM, Kip Koon <computerdoc at sc.rr.com> wrote:
> 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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