Re: Static PET repair (was Re: VCF PET Alive! - April 24th to May 2nd)

From: Marko Mäkelä <>
Date: Tue, 30 Mar 2010 07:31:47 +0300
Message-ID: <20100330043147.GC22057@x60s>
On Mon, Mar 29, 2010 at 04:57:54PM -0400, Ethan Dicks wrote:
> The other board (with 6540 ROMs and 2114 SRAMs and the broken Japanese
> CHRGEN ROM) passes all RAM tests (and does come up with the BASIC
> splash message), but still locks up on cassette operations.

Could it be a broken 6522 (or is the PET tape port also driven by a 6520)?

If I remember correctly, the very first defect of my C64 was that it hung
when trying to write to tape.  Apparently, the 6510 on-chip I/O port had
been damaged so that when it tried to wiggle the CASS WRITE line, also the
memory configuration lines were being changed.


       Message was sent through the cbm-hackers mailing list
Received on 2010-03-30 05:00:04

Archive generated by hypermail 2.2.0.