[Coco] OS-9 Font file format

[Bob Devries]

On page 2-1 there's an overview of what the parameter names mean, so STY is 
SCREEN TYPE.

BTW, Page numbers are for the original Tandy OS-9 manual.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Mike Rowen" <mike at bcmr3.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, September 20, 2011 8:03 AM
Subject: [Coco] OS-9 Font file format


> Can anyone point me to detailed information on OS-9 Font files? I have
> conjectured most of it, but wondering if there is any genuine spec for
> these?
> I can find no references to the first, second, and fifth bytes that begin 
> a
> font entry. I found no detailed info in the OS-9 manuals, Multi-Vue, or
> Inside OS-9 LII books. I have not
> encountered any different values for these bytes, so in the end, its not a
> show stopper. However, I like to understand how things work. :) Any
> details on font files is appreciated. Also, my conjecture about the 6th -
> 11th bytes may be incorrect. Perhaps the answer lies in NitrOS9 source 
> code?
>
> For example, the first 11 bytes of the OS-9 stdfonts is:
>
> 1b 2b c8 01 05 00 08 00 08 04 00
>
> Byte 1 ???
> Byte 2 ???
> Byte 3 is the group (c8= group 200)
> Byte 4 is the buffer number (01)
> Byte 5 ???
>
> The rest of this is conjecture based on looking at the different fonts:
>
> Byte 6 & 7 is the font width in pixels (00 08 = 8 pixels wide)
> Byte 8 & 9 is the font height in pixels (00 08 = 8 pixels wide)
> Byte 10 & 11 is the number of bytes in the font (04 00 = 1k or 1024 bytes)
>
> I also see that after the 3rd font in the stdfonts file (pulled from
> NitrOS9), there are references to group 206 (ce) and its not clear what 
> all
> the info after the font 3 bytes is about, though I have not spent any time
> yet attempting to reverse engineer the end bits of the font file. Thanks.
>
> Regards,
> -Mike Rowen
>
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