Re: 6809 assembly knowledge needed

From: Ethan Dicks <>
Date: Thu, 21 Jan 2010 10:15:48 -0500
Message-ID: <>
On Thu, Jan 21, 2010 at 3:20 AM, Philip Lord <> wrote:
> Thanks for the update Ethan. Sorry to hear you are so crazy busy, hopefully
> for your sake your schedule will ease up.

Once we hire a second SA, things should ease back.  Right now, I'm
working about 55-60 hrs/week.

> 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.

I will be sure to try 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.

Most likely.  I have a couple of ROM/RAM boards, but I have yet to
finish building them.  Right now, I'm short on 20/40-pin headers.

> 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.

I'd recommend using a 2732 - they are much more common (I can probably
burn one for you and toss it in).  2532s are perfect for replacement
masked-programmed ROM replacements in newer PETs (post-6540s) or for
adding user-contributed firmware into the "open" blocks on dynamic
PETs.  My old 2001-32N always had a full suite of enhancements (12K,
loaded as 4K, 4K, 2K and 2K - for various utilities).

I forget the minor difference between a 2532 and a 2732, but you can
*not* drop a 2732 into a regular ROM socket - perhaps you can for a
Char ROM, though.  They are so close that a quick inspection of the
footprint differences should suffice to reveal what's unique.


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Received on 2010-01-21 17:00:43

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