[Coco] f83 for the 6809 -- It'a Alive!

[tim lindner]

On Fri, Oct 17, 2008 at 11:33 AM, Darren A <mechacoco at gmail.com> wrote:
> On 10/17/08, tim lindner wrote:
>
>> ....
>> .... with DSKCON comes a large portion of BASIC and
>> it's overhead. Whenever I imagine I'm in a position like Brett, I'm
>> always ripping DSKCON from the ROM and make it independant.
>>
>
> What "large portion of BASIC and it's overhead" are you referring to Tim?
>
> The Tandy versions of DSKCON are almost completely self-contained.
> Other than 2 calls to a short delay-loop subroutine in COLOR BASIC at
> $A7D1, there is no reliance on any other BASIC routines.
>
> Tandy's DSKCON does require use of the following RAM addresses:
> 008A - 008B:  Assumes these two bytes are always zero
> 00EA - 00F0:  The documented DSKCON parameter block
> 0109 - 010B:  NMI Vector (jumps to Disk Basic's service routine)
> 097E - 0986:  Variables  (TRKTBL,NMIFLG,DNMIVC,RDYTMR,DRGRAM)

Sometimes I think I mouth-off like this just so smarter people than I
can put me in my place. :)

A version of DSKCON that is relocatable and doesn't use predefined
variable address would be nice.


-- 
tim lindner
tlindner at macmess.org