Re: ROM Dump of Amiga Keyboard controller

From: Jim Brain <brain_at_jbrain.com>
Date: Sun, 20 Jul 2014 22:12:10 -0500
Message-ID: <53CC850A.2090908@jbrain.com>
On 7/20/2014 7:06 PM, silverdr@wfmh.org.pl wrote:
> On 2014-07-17 at 22:44:32, silverdr@wfmh.org.pl (silverdr@wfmh.org.pl) wrote:
>
>>> I've got all the details from Jim, including schematic and the code. I'll prepare it
>>> and put online soon.
>>   
> http://e4aws.silverdr.com/hacks/6500_1/
>
> Fully online.
>
> Thanks big time to all who contributed!
> --
> SD!
>
>         Message was sent through the cbm-hackers mailing list
I need to make an update to the code, and your page:

"Gerrit Heitsch, modified based on empirical testing.  Once synchronization
     happens, it loads one memory location into the .A register, sends the
     opcodes to store it to PORTA, and then drops out of TEST mode 
during the
     cycle when the store will actually happen.  It then JAMs the CPU, 
reads the
     data from PORTA, sends it to the UART, and repeats the process, 
using a new
     memory location.  "

Is a bit incorrect.  It should be:

"Gerrit Heitsch, modified based on empirical testing.  Once synchronization
     happens, it instructs the internal CPU to load one memory location 
into the .A
register, dropping out of TEST during the cycle when the load from ROM 
occurs.
It then stores the data to PORTA, JAMS the CPU, and the AVR reads the 
data from
PORTA, sends it out via the AVR UART, and then repeats the process for 
the next
memory location."

Feel free to update the verbiage int the source.

Jim


-- 
Jim Brain
brain@jbrain.com
www.jbrain.com


       Message was sent through the cbm-hackers mailing list
Received on 2014-07-21 04:00:02

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