Re: ROM Dump of Amiga Keyboard controller

From: Gerrit Heitsch <>
Date: Sat, 05 Jul 2014 20:20:00 +0200
Message-ID: <>
On 07/05/2014 08:13 PM, wrote:
> On 2014-07-05 at 20:02:07, ( wrote:
>> 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.
> I was also interested how they did it internally. Like if they changed the 6502 core (doubtful) or for example wired the two upper address nybbles together or something like that...

That should be easy for Jim to find out. Dump page 0F und page FF and 
see what you get...

Maybe they just made the upper 4 address bits "don't care" by not 
including them into any selection logic? That way their state doesn't 
matter and you don't need to change the CPU core at all.


       Message was sent through the cbm-hackers mailing list
Received on 2014-07-05 19:01:37

Archive generated by hypermail 2.2.0.