[Coco] BASIC format questions

[Arthur Flexser]

In a CoCo without Disk Basic, with the default PCLEAR 4 in effect, then
Basic indeed starts at $1E01.  If Disk Basic is present, then it starts at
$2601.  This moves up or down by 6K if you increase or decrease the PCLEAR
argument by one.

The address of the start of Basic is found in locations $19-1A.

Art

On Mon, Mar 13, 2017 at 1:37 PM, RETRO Innovations <go4retro at go4retro.com>
wrote:

> 10 ? "H"
>
> 20 goto 10
>
>
> translates into:
>
>
> 1E 0A   00 0A  87 22 48 22 00
>         10     ?   "  H  "  EOL
> 1E 13   00 14  81 A5  31 30 00
>         20     go to  10    EOL
> 00 00
>
>
> I understand all the rest, but not the 1E0A and 1E13.  I mean, I
> understand what they mean (address of start of next line), but I am not
> sure what it is specifically pointing to?
>
>
> If I assume the second 1E is at memory location 1E0A, then 1E13 points to
> the 00 of the end of BASIC marker.  That would imply that BASIC starts at
> 1E01.  Am I right on that point?  Does that always hold true (Commodore,
> for one, moves the start of BASIC depending on various things)?
>
> I ask because I need to shift all of the addresses for interpreting. How
> do I know where the BASIC start is given an arbitrary BASIC file?
>
> Jim
>
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