Re: ROM Dump of Amiga Keyboard controller

As before, I still don't have a clear picture of how exactly is this supposed to work. Either this or the (presumably simpler) approach with an EPROM and a 4040. I think I am not alone in this and that is one of the reasons nobody (including myself) haven't done it yet. 

On 25 June 2014 00:14:42 CEST, "Kajtár Zsolt" <soci@c64.rulez.org> wrote:
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>>>> Guys, I have a bunch of the 1520 ploter MCUs... They are 6500/1 of 
>>>> course.
>>> 
>>> It would be interesting to have the ROM dumped... I've created a
>1520 
>>> emulation for VICE, but I never could exhaustively test all
>incorrect 
>>> input to it. So while the emulation seems ok for correct input, for 
>>> buggy programs it may certainly work differently. With a disassembly
>
>>> this could be improved.
>> 
>> It was one of the main reasons I started the discussion on this
>matter 
>> some two years ago. The KBD controller is just another reason. I am
>> still willing to do the experiment, provided there is a well-backed
>> consensus on how this should be done.
>
>Just like two years ago I'm still on the opinion that the easiest would
>be
>to wire it into an existing 6502 based system where the external
>processor
>is doing the fetches for the 6500/1 so that port PC would be directly
>connected to the external data bus.
>
>Synchronization could be ensured by using half the clock of the 6500/1
>for
>the external processor, and starting them parallel using the reset
>signal.
>If the phases don't match there are only a few variations to try.
>
>After releasing the test mode the external processor could handle the
>communication with the 6500/1 side by using the other ports and some IO
>interface chip.
>
>But whatever. No one really cared two years ago, so this must be
>impractical/unworkable.
>
>- -- 
>						    -soci-
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