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

[Juan Castro]

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-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
>>>
>>> --
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>
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