[Coco] DECB BIN file format

[William Astle]

On 12-12-25 10:23 PM, Juan Castro wrote:
> I'm studying the BIN file format and found this:
>
> http://lwtools.projects.l-w.ca/manual/x24.html
>
> So I looked at the binary LWTOOLS generates for CaChars. Here's the
> start of an hex dump of it:
>
> 00000000  00 00 02 00 00 f6 ad 00  08 25 77 d0 57 65 6c 63  |.........%w.Welc|
> 00000010  6f 6d 65 20 74 6f 20 43  61 43 68 61 72 73 20 31  |ome to CaChars 1|
> 00000020  2e 34 2e 30 0d a9 20 32  30 31 32 20 4a 75 61 6e  |.4.0.. 2012 Juan|
>
> So... there's a block of 2 bytes that's being loaded at address 0000?
> And those bytes are F6 AD? What's that for?
>
> The block that comes after that is my program, that's OK. The
> postamble is intelligible too. But what's with that 2-byte block?

That means you have something generating those two bytes with an orign 
of 0. Since it's the first block in the file, it's probably before the 
first ORG statement since the default origin is 0. Without seeing the 
source code, I can't make any more detailed comment except that it's 
likely to be a data statement of some kind (fdb, fcb, etc.) because F6 
is "LDB extended" which is a 3 byte instruction so there's no way that 
could generate a 2 byte block.