Re: Microcontroller "PEEKing" into C64 memory?

Kinda a little off topic, but I thought it would be cool to build a little address monitor circuit. Take the top 8 address lines and split them into 4 HI and 4 LO groups, run both of those 4 lines into 4-to-16 decoders and use those to drive a 16x16 LED matrix. Each LED would represent one page of memory and you could watch the CPU access visually. You could use different coloured LEDs to represent RAM, ROM or I/O. Anyone heard of something like that??? ;-)
Steve
 

      From: Jim Brain <brain@jbrain.com>
 To: cbm-hackers@musoftware.de 
 Sent: Thursday, January 21, 2016 1:56 PM
 Subject: Re: Microcontroller "PEEKing" into C64 memory?
   
On 1/21/2016 12:32 PM, Per Olofsson wrote:
> On Thu, Jan 21, 2016, at 05:18 PM, Leif Bloomquist wrote:
>> Hi all,
>>
>> I have an idea for a project that would require an external
>> microcontroller to be able to "peek" into parts of the C64 Memory.
>>
>> It wouldn't matter where.  I/O1 and I/O2 might be easiest, but some
>> unused space like $02A7-$02FF could also work and not interfere with
>> external devices.  Only would need 8 bytes or so.
>>
>> What would be the easiest way to go about this?
> If what you need is mirroring of a portion of C64 ram I have a FIFO
> based bus snooping design that could work, but I haven't had a chance to
> verify it.
>
I'd also be interested in a design, as I have a few ideas that need such 
an integration.  I had been planning to implement 8 registers in a CPLD 
with dual port access, but maybe there are better ways to do this...

Jim


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


      Message was sent through the cbm-hackers mailing list


  

       Message was sent through the cbm-hackers mailing list