Re: ROM Dump of Amiga Keyboard controller

From: Jim Brain <>
Date: Sat, 05 Jul 2014 21:40:19 -0500
Message-ID: <>
On 7/5/2014 10:52 AM, Kajtár Zsolt wrote:
> I've made sources for both versions for easy comparison what was changed:
The font layout in the old listing seemed better to me, as it showed how 
the numbers were calculated.
> There were some IEC bugs (timing and responding to channels >=8), pen didn't
> move far enough on change request and the steppers were not that fast as
> expected. Rest seems to be optimizations.
I did a diff, but more context would be of interest.

Also, it looks like line 968  (#65) and 990 (#35) are constants that can 
be put at the top of the file, as are 889/903 time delay amounts (in the 
-03 ROM).

line 835/837 is interesting.  Wonder what is going on there.
lin 427 says unused, but the same line is in the -01 ROM.  Is it unused 
in both?
Was the lack of storing cmd_x to >512 just an optimization?  How do they 
know it is 0 already?
Line 283 (#67) looks like another constant.

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Received on 2014-07-06 08:01:05

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