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Commodore_Free_Issue_35_2009_Commodore_Computer_Club.d64
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vga update
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2023-02-26
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*************************************
VGA Breakthrough
*************************************
http://www.commodorescene.org.uk/
The C=VGA adaptor
TEST VERSION 1 BUTCHERED TOGETHER AT
THE MINI MEETING (I couldn't find any
solder and the connector is from a
1541 floppy drive we butchered and is
now no longer with us well on this
electronics planet R.I.P my fine 1541
you served me well)
After the Commodore Computer club
Mini meeting with Myself Shaun, Chris
and Alan, all trying to get the A22
board working. Alan decided he
couldn't give up! And after many
trials and testing he finally had a
big breakthrough. It looks as though
the Commodore Scene VGA project may
finally be finished; and by none
other than Alan himself! I must
congratulate Alan for sticking with
the project in spite of all the
setbacks Alan has spent a great deal
of his own time and money on the
project here is an email he sent to
Myself, Chris and Alan of the CCC UK.
THE MAGIC A22 BOARD FROM CHINA!
http://www.arcademvs.com/ I don't
think the site is up but search for
A22 CGA board
E-mail
From: Alan Bairstow
Subject: VGA
Hi everyone,
After quite a bit of experimenting
and ready all the stuff that you've
been sending me, I think I have can
now make the following items if
anybody needs them :
c64/c128 40 column display
1) S-video adapter from an existing
LCA lead, this is quite simple as a
simple resistor on the chroma line
will bring the colours into focus (no
blurring). I am going to adapt my
current cable to bring down the
chroma signal with a small resistor.
2) SCART lead - these are already
available, however, if there is no
resistor on the chroma line then
interference & colour bleed can be an
issue (as I showed at the recent show
with the s-video lead) so it might be
worth making these to our own
specifications.
3) SVGA adapter from an existing LCA
lead, in theory this should also be
possible but I haven't tested it yet.
c128 80 column colour display (the
B&W display is easy but not worth
having really)
1) S-video adapter (or possibly just
a cable), I am still trying to get
the output crystal clear but I have a
working test rig which looks very
nice. We still need the A22 board to
convert RGB to S-video so this will
have to be built into a box to make
it look nice.
2) SCART lead, I will be making this
lead soon and looks like it should be
fairly straight forward. This will
have to be a custom made lead but I
am hopeful that all the resistors
will fit inside the SCART casing.
3) SVGA adaptor, again it may be
feasible to create this lead using
the same method as in the SCART
adaptor but I'm not sure where all
the resistors will go :-( A fly lead
for the sound will also be need but
this is easy.
Personally I prefer the SVGA lead as
this will allow connection to any
monitor - which is what I want. The
only real problem is going to be the
variations in different monitors and
this becomes more of a problem if you
are using SCART or S-Video.
Lastly, I would like to thank
everyone (especially Chris) for all
the info you've sent me over the past
few months, I would never have got
this far without you and I've come
closer to my goal (80column > SVGA)
in the past two months than I have in
the previous 5 years ! I've learnt a
lot and some of it has been hard for
my poor little brain to comprehend
but we are nearly there.
I'll keep you posted.
All the Best, Allan
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