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

[Cocodemus]

052ddc is for a 128mb os-9 partition. Enough for most users.

Sent from my iPhone

> On Apr 5, 2015, at 2:48 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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