[Coco] absense of DLOAD in CoCo 3

[Robert Gault]

Roger Taylor wrote:
> This is something I'm asking because I have never taken the time to even 
> look into the matter.
> 
> Is it possible to switch to CoCo 2 emulation and ROM mode to get the 
> DLOAD code back?  If the CoCo retains the original ROMs and just patches 
> them at startup, this should be possible unless I'm missing something.
> 
> 
> 
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> 

It seems that while the ROMs do get patched at a cold start, the code at 
$8C1B (DLOAD) is indeed different with a Coco3. Part of DLOAD is gone 
and returning to ROM mode does not bring it back.

As a test you can boot a Coco3,
POKE&HFFDE,0
EXEC &HC002
and you will be in ROM mode without any Super Extended commands. If you 
print a few bytes from $8C1B on, you will find the same code given in 
"Unravelled" where DLOAD is partially missing.