Re: ROM Dump of Amiga Keyboard controller

From: Rainer Buchty <>
Date: Wed, 11 Jun 2014 17:59:38 +0200 (CEST)
Message-ID: <alpine.DEB.2.02.1406111752430.14285@localhost>
On Wed, 11 Jun 2014, Segher Boessenkool wrote:

> But then you cannot dump the ROM that way.

Not sure what you mean here. You cannot dump it anyway before falling 
back to "normal" mode, because any read to the ROM area would result in 
a PCx access, right?

> Many micros with a similar "load the program over a port" mode disable 
> that mode as soon as some jump instruction is executed (those do not 
> make sense when blasting in the insns anyway); maybe the 6500/1 does 
> something similar?  It shouldn't be very hard to try out all ops, see 
> which ones stop port fetch.

Interestingly, on this list we had a similar discussion almost two years 
ago ("6500/1 ROM" starting Sep 16, 2012), where I assumed that such a 
"release on jump" mechanism might exist.

It looks like none of us since then found the time setting up some sort 
of test rig ...


       Message was sent through the cbm-hackers mailing list
Received on 2014-06-11 16:01:39

Archive generated by hypermail 2.2.0.