[Coco] OS-9 Font file format

[Mike Rowen]

Thanks for finding the needle in the haystack for me! GPLoad is indeed the
missing link for me. As for screen type, the STY field must be a minimum
type value as the fonts will function in type 5,6,7,8 Window types (all the
graphic window types)?

On Mon, Sep 19, 2011 at 6:16 PM, Bob Devries <devries.bob at gmail.com> wrote:

> Mike,
>
> the specs are in the OS9 manual.
>
> The font files are made up of escape sequences which are the commands
> needed to activate (if that's the right word) the font.
>
> So, 1B 2B C8 01... is the GPLoad command (page 3-19 of the Windows section
> of the manual).
>
> The bytes after the two-byte command 1B 2B are:
>
> GRP (group number)
> BFN (buffer number)
> STY (format (screen type?))
> HSX/LSX (X dimension of block)
> HSY/LSY (Y dimension of block)
> HBL/LBL (number of bytes of data following)
> DATA......
>
> Hope that helps.
>
> 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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