Re: 6560 chips

From: Marko Mäkelä (
Date: 2007-01-11 09:23:12

On Wed, Jan 10, 2007 at 11:38:14PM +0200, Pasi Ojala wrote:
> > I have one unreliably working NTSC VIC-20 circuit board, and I
> > might want to convert one PAL VIC-20 to NTSC, like Pasi Ojala did.
> Emphasis on the "circuit board" if I remember correctly :-).

Yes, it's the board I got from Daniel Dallmann (of LUnix fame).  It is
the non-CR board with a two-prong power connector.  Interestingly, the
two-prong connector is mechanically incompatible with the European
two-prong Vic-20 connector if I remember correctly.  I've been using
a car battery charger (12V, several amps) as the power supply.  It could
be that the board doesn't like the power supply.  The full-wave rectified
AC output from it should be fine, because the original Vic-20 expects AC,
but the connection from the slightly rusty alligator clips might be unreliable.

Maybe I'll fire up the computer soon again, to see your NTSC-fixed VIMM II.

> The NTSC-converted VIC20 works okay, although it still uses a
> PAL ROM for that fancy twisted screen centering.. As a final
> touch the machine actually has a scandinavian keyboard. <g>

You should burn your own NTSC KERNAL with Swedish/Finnish keyboard
table. :-)  And JiffyDOS (port it yourself if it doesn't officially
exist). :-)

> (I have three 6560's here from Marko's batch in safe-keeping in
> case someone really needs one.)

Okay, after I ship one to Ruud, we both will have 3 chips left.  We
might be the ones with most chips left, since I must have distributed
the 42 chips to several people.


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