[Coco] Patching NitrOS9 for 8 meg

[Gene Heskett]

On Thursday 03 May 2018 09:42:30 Doug Fraser wrote:

> What about the nitros9 level 3 code to free up system ram? If that's
> what's needed then we possibly have the means to move the scf and rbf
> stuff to local ram and free up system ram and maybe have room for the
> larger memory map.  Just a thought. 
>
I have worked on that, but the loader that is supposed to determine that 
stuff only switches once, and that will have to be fixed so it switches 
back at the end of each module, treating each independently. Until that 
is fixed, and from extensive study of the code we do have, I was not 
able to get my head on the same page as the author of the code we have.  
The bottom line is that we do not yet have code that will actually boot. 
And since the pulmonary embolism I had about 3 years back cost me a few 
IQ points, I don't feel capable of fixing that.

Take that as a challenge, you younsters.
>
> Sent from my Samsung Galaxy smartphone.
> -------- Original message --------From: Bill Pierce via Coco
> <coco at maltedmedia.com> Date: 2018-05-03  02:16  (GMT-08:00) To:
> coco at maltedmedia.com Cc: Bill Pierce <ooogalapasooo at aol.com> Subject:
> Re: [Coco] Patching NitrOS9 for 8 meg Doug, I wondered the same thing
> until it was explained to me, then I got involved with the NitrOS9
> development and saw for myself, the whole problem with more than 2 meg
> of memory is the size of the memory map table kept in system memory.
> Even just at 4 meg, the table grows to be twice what it is. At 8 meg
> it's 4 times as large!! If I remember correctly (correct me if I'm
> wrong), the memory allocation table is 256 bytes, which is 1 byte per
> 8k block (8*256=2meg). A memory map for 8 meg would take up 1k of
> system space and right now, system space is valuable. There are
> probably ways around this, but would most likely involve a major
> rewrite of how the map is accessed. As for actual access to the
> memory, only minor patching would be needed.

-- 
Cheers, Gene Heskett
--
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