Re: 6809 assembly knowledge needed

From: Philip Lord <>
Date: Thu, 21 Jan 2010 17:20:23 +0900
Message-id: <>
Thanks for the update Ethan. Sorry to hear you are so crazy busy,  
hopefully for your sake your schedule will ease up.

With the board that works with the dead CHRGEN ROM, did you have a  
chance to test it with loading and saving?
It would crash for me when I tried that.

A while back (before I actually sent you the boards)in anticipation of  
getting the boards working (very optimistic of me), I ordered Nicolas  
Welte's RAM/ROM replacement board, and his 6540/6550 boards as kits.  
Last weekend I actually had a chance to build them up. That will  
probably deal with any future issues with the Japanese motherboard. As  
for the possible dead CHARGEN ROM in the other board I believe that a  
2532 EPROM's can be used as a replacement for the this  
true? if so I have a few of these EPROMs hanging around and can easily  
burn one with the appropriate ROM file.

Thanks again

On Jan 20, 2010, at 5:51 AM, Ethan Dicks wrote:

> On Thu, Jan 14, 2010 at 1:37 AM, Philip Lord <>  
> wrote:
>> No, I haven't gotten the board back from Ethan yet.
>> I think he's suffering from having too many projects on at the same  
>> time...I
>> certainly know how that feels.
>> Ethan, any progress?
> Yes.  I've been slammed.  I was one of two people maintaining an
> web-based educational product (electronic classroom for thousands of
> students) until right before Xmas.  The other guy left the project,
> leaving me to keep it all running since then.  I've had 5 sleepless
> nights in the past week for planned and unplanned maintenance.
> As for the PETs, I have identified that the one board needs new
> rectifier diodes and have secured replacements.  The other PET board
> worked perfectly for me with a genuine CBM character ROM, so I have my
> doubts that the 2316B-on-an-adapter-board ROM is going to read easily.
> That ROM gives me blank chars when installed in the same board.  It's
> unfortunate since I've been able to (barely) make out the CBM part
> number and it seems to be a previously unknown CHRGEN ROM variant.
> Ultimately, I need to build a reverse 6540-2316B adapter so I can read
> the ROM in a standard EPROM reader/writer to see if I can get any
> contents from it.   Beyond that, it'd be a case of getting one of Jim
> Brain's adapters and throwing a newish ROM into it to at least get the
> board working again.
> That's as far as I've been able to get since the Holidays started -
> they may be "time off" for some people, but not for me.
> -ethan
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Received on 2010-01-21 09:00:04

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