[Coco] Disto 2MB kit

[L. Curtis Boyle]

On Wed, 21 Jun 2006 20:11:56 -0600, Gene Heskett  
<gene.heskett at verizon.net> wrote:

> Bob Devries wrote:
>> Does anyone here have the disk that came with the Disto 2MB upgrade?
>>  I have the hardware and the disk, but bit-rot has got to the disk, and  
>> it is now unreadable. If anyone can make a DSK file of it, I would be  
>> grateful.
>
> Bob, I *think* (but don't take it to the bank) that the only thing you  
> need to do (for os9 anyway) is check the manual for the init modules  
> format, and change a byte thats now set to $3F in the standard init  
> module to an $FF.  This byte sets (ISTR) the top page of ram that the os  
> maps in while its booting.  Don't forget to verify the module to fix the  
> crc after you've located it and edited it with dEd.
>
> There may be other fixes required, but thats the only one that comes to  
> mind and I'm 1000 miles NW of my disks right now so I can't check any  
> closer than my wet ram.
>
     GRFDRV needed to be patched as well, to force it to make sure that all  
of a graphics screen fit entirely into a 512K bank, and to also allow  
GRFDRV to toggle which 512K bank the video was in.


-- 
L. Curtis Boyle