Re: ROM Dump of Amiga Keyboard controller

From: silverdr_at_wfmh.org.pl
Date: Sat, 5 Jul 2014 20:01:58 +0200
Message-ID: <etPan.53b83d96.327b23c6.1faa@szaman.lan>
> >> You mean the IEC commands interpreter? I guess so. The missing block
> >> was...
> >
> > Yes.
> >
> >>> For fun I've dumped the font to svg (embedded in html) here:
> >>> http://singularcrew.hu/temp/1520.html
> >>
> >> ... the font, which of course you demotivated me again before I even
> >> started to try to understand how it is constructed ;-)
> >
> > Ok, I must admit it was not nice to spoil the fun of disassembling it when I
> > knew you were already working on it. Sorry, I couldn't resist the challenge ;)
> 
> For me the more important detail is how you got the font out of those
> bytes? Meaning how are they interpreted.

Exactly. I had a look, realised that the whole code content seemed intact. Had a cursory glance at what part does more or less what and decided that deciphering the fonts (which was my original objective the first time I started the thread about it) is not a task I could do within the time I had.

> I'm still surprised that they managed to fit the whole printer control
> and IEC protocol plus the font into only 2 KB ROM.

That's something that boggles me every time I look at it. And in the beginning I even checked again the datasheet if they really meant "$(0)FFF" and not just shortened the full "$FFFF" ;-) But it also clearly states that only 2KiB of ROM is available. Impressive.

-- 
SD!

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Received on 2014-07-05 19:00:02

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