RE: PET 2001 Fix....WAS: Will pay good money for NON working PET 2001 motherboard.

I take it the 2316 is soldered into this adapter (or you wouldn't need a 6540
to JEDEC adapter to read it); if it is indeed a Japanese character set then I
wonder whether there's more to it than just the CG ROM (or if it is just a bad
2316 or adapter).

Anyway, I'm interested since I happen to have a spare Japanese keyboard 
and my girlfriend is studying Japanese at the moment (although I doubt she'd 
want to start using a PET for her Japanese writing ;-)

If you do manage to read the ROM and it looks like it works, I'd love to get
a binary dump.

mike
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From: 	Ethan Dicks[SMTP:ethan.dicks@gmail.com]
Sent: 	Monday, November 23, 2009 9:42 AM
To: 	cbm-hackers@musoftware.de
Subject: 	Re: PET 2001 Fix....WAS: Will pay good money for NON working PET 2001 motherboard.

On 11/21/09, Philip Lord <random6000@mac.com> wrote:
> Hi again,
> I just wanted to say a big thanks for everyones help, and to apologize
> for being such a dumbass for not being able to fix the board.
>
> Anyway, Ethan has the boards now, and has kindly offered to take a
> look at the problem for me. Thanks again Ethan.

So far, it looks like the one board with the PSU issues has fried
rectifier diodes - With ~9VAC coming onto the board from the brown
wires from the transformer, I get 1.8VDC at the inputs to the 7805s.

As for the other board, the one with the 2316 Character ROM on a 6540
adapter that seems to be flaky, I happened to have a 6540-010 ROM and
dropped it in place of the ROM adapter.  The board comes up, displays
the BASIC startup message, and runs a simple loop and print BASIC
program.  It's hard to read the 2316 Character ROM because of the rust
on the package, but it appears to me to read 901447-12.  This is
interesting because the only ones I was aware of online copies of are
-08, -10, and -14 (all of which I think I have in actual boards).  -12
could easily be a "lost" Japanese variant.  I just need to build a
6540-JEDEC adapter and I can read this out.

I don't think I have any 3A rectifier diodes lying about to fix the
one board, but they are under $0.20 from most suppliers.

-ethan

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