[Coco] extended rom

[Bruce W. Calkins]

That would be the "Extended Disk Basic" ROM.

The "Color Basic" ROM had four varieties.  1.1 improved the printer 
driver and allowed 64k.  1.2 improved speed, and 1.3 added support for 4 
  bir RAM chips.

Extended Color Basic came in two varities that I know of.  1.0 and the 
more common 1.1.

Disk Extended Color Basic came in two varieties.  1.1 added the DOS 
command and some minor housekeeping was done.

Super Extended Color Basic came in with the CoCo 3.  It used the same 
information in the ROMs as the CoCo 2 with a overlay and addon from 
Microware.  It shows up at startup as 2.1 without a disk drive.

Bruce W.



Gene Heskett wrote:
> On Tuesday 02 August 2005 10:12, Mike Kandrac wrote:
> 
>>does any one know what the difference between the exteded rom 1.0
>>and 1.1 and which computers got which rom
> 
> 
> One difference that I'm aware of is that the 1.1 version has the dos 
> command that 1.0 doesn't.  This makes booting os9 as simple as 
> inserting the disk and typeing 'dos'.
> 
> Another difference is in one of the jump tables at the beginning of 
> the rom, where the 1.0 version violated tandy's own guidelines about 
> pointer useages.  I ran into this when converting Jake Commanders 
> 'ChromKey' utility to run on 1.1.  That was waaaay back up the 
> log. :-)
> 



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