Weird vertical lines (c64)

daznic · 05 March 2009, 11:54

First off, this is a c64 problem ( sorry, I can not after lots of tries & e.mails to Kim lemon, register on Lemon 64 forums !! )
Anyways, I`m sure a lot of you guys have C64`s so you may be able to help.

I have three c64,s two newer C64C`s and a manky old Beadbin. Problem is when I use the C64C ( Both of them ) I get faint vertical lines down the screen, not to bad but noticeable.

With the old breadbin, the screen is perfect, crystal clear.

I am using an RGB scart cable to a 32" CRT TV.

Cheers !

PWLM · 05 March 2009, 12:29

Just a thought, are the C64Cs native to your country? I know there were some display issues between US and other countries with the GFX chip because of 50/60Hz display differences.

daznic · 05 March 2009, 12:57

Yes, they are both PAL.

PWLM · 05 March 2009, 13:06

Maybe a screenshot so we can see exactly the conundrum?

Retro-Nerd · 05 March 2009, 17:04

You use a SCART composite video cable, the C64 has no RGB output.

For the C64c vertical lines: That's sadly normal, the VIC-II chip causes this annoying issue. All you could try is to use a S-Video cable, this "should" improve the image quality for the C64c and newer models.

musashi5150 · 05 March 2009, 18:59

Sounds similar to the NeoGeo RGB problem. Do the lines look like the first screenshot on this page: http://www.mmmonkey.co.uk/console/neo/video.htm

Retro-Nerd · 05 March 2009, 19:09

Yep, something like this. The C64c composite out on TV set is awful. Maybe some old monitors give you better results. Anyway, you could also try an S-Video cable. It probably depends on the used cable and TV set if you get a better image or not. Protovision has some quality cables from Doc of Desire:

http://protovision-online.de/hardw/h...art.htm#cables

Jope · 05 March 2009, 21:23

Like said, the vertical banding is a problem of the newer VIC-IIs. The VIC-IIe in C-128s shows it quite badly.

Part of the design, nothing you can do.

PS. Always prefer s-video when connecting the C-64 to a display. :-)

daznic · 05 March 2009, 22:05

Yeah the lines are as shown in the pic, crazy that a problem occured in a so called improved C64 !
Think i`ll stick with using the old breadbin, the picture is really superb.
Not sure really exactly what my cable is, all I know is that it was from a seller on ebay and seems pretty well made with quality cable - C64 video to scart.

Is it possible to swap the mainboard out of a breadbin into a c64c so getting good picture and nicer keyboard ?

Jope · 06 March 2009, 08:42

Sorta. The keyboard mounting brackets might not be compatible with the old motherboard.. You'll have to use your imagination when modifying them.

kipper2k · 06 March 2009, 19:43

I had issues with a lousy display. A lot of the cables that are out for the C64 don't seem to be shielded all that well or are old so i decided to mod my C64. so i can use regular composite cables for both audio and video.

Heres a pic. (the cable coming out of the back is just a test cable). The Yellow and white RCA jacks are the A/V outputs.

Retroplay · 15 December 2011, 20:01

Apparently it can be fixed just take a look at this.
http://www.lemon64.com/forum/viewtopic.php?t=40570

Sadly I can't find the schematic to build it as I would love to do this fix on my C64c.

roy bates · 16 December 2011, 09:42

Quote:

Originally Posted by Retroplay

Apparently it can be fixed just take a look at this.
http://www.lemon64.com/forum/viewtopic.php?t=40570

Sadly I can't find the schematic to build it as I would love to do this fix on my C64c.

does anyone know what the chip is in the picture?

i want to build this circuit.

05 March 2009, 11:54	#1
daznic Registered User Join Date: Jan 2009 Location: chester / england Posts: 172	Weird vertical lines (c64) First off, this is a c64 problem ( sorry, I can not after lots of tries & e.mails to Kim lemon, register on Lemon 64 forums !! ) Anyways, I`m sure a lot of you guys have C64`s so you may be able to help. I have three c64,s two newer C64C`s and a manky old Beadbin. Problem is when I use the C64C ( Both of them ) I get faint vertical lines down the screen, not to bad but noticeable. With the old breadbin, the screen is perfect, crystal clear. I am using an RGB scart cable to a 32" CRT TV. Cheers !

05 March 2009, 19:09	#7
Retro-Nerd Missile Command Champion Join Date: Aug 2005 Location: Germany Age: 52 Posts: 12,438	Yep, something like this. The C64c composite out on TV set is awful. Maybe some old monitors give you better results. Anyway, you could also try an S-Video cable. It probably depends on the used cable and TV set if you get a better image or not. Protovision has some quality cables from Doc of Desire: http://protovision-online.de/hardw/h...art.htm#cables Last edited by Retro-Nerd; 05 March 2009 at 19:15.

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05 March 2009, 12:29	#2
PWLM He found it at the zoo.. Join Date: Jun 2008 Location: Townsville / Australia Posts: 151	Just a thought, are the C64Cs native to your country? I know there were some display issues between US and other countries with the GFX chip because of 50/60Hz display differences.

05 March 2009, 12:57	#3
daznic Registered User Join Date: Jan 2009 Location: chester / england Posts: 172	Yes, they are both PAL.

05 March 2009, 13:06	#4
PWLM He found it at the zoo.. Join Date: Jun 2008 Location: Townsville / Australia Posts: 151	Maybe a screenshot so we can see exactly the conundrum?

05 March 2009, 17:04	#5
Retro-Nerd Missile Command Champion Join Date: Aug 2005 Location: Germany Age: 52 Posts: 12,438	You use a SCART composite video cable, the C64 has no RGB output. For the C64c vertical lines: That's sadly normal, the VIC-II chip causes this annoying issue. All you could try is to use a S-Video cable, this "should" improve the image quality for the C64c and newer models.

05 March 2009, 18:59	#6
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	Sounds similar to the NeoGeo RGB problem. Do the lines look like the first screenshot on this page: http://www.mmmonkey.co.uk/console/neo/video.htm

05 March 2009, 21:23	#8
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Like said, the vertical banding is a problem of the newer VIC-IIs. The VIC-IIe in C-128s shows it quite badly. Part of the design, nothing you can do. PS. Always prefer s-video when connecting the C-64 to a display. :-)

05 March 2009, 22:05	#9
daznic Registered User Join Date: Jan 2009 Location: chester / england Posts: 172	Yeah the lines are as shown in the pic, crazy that a problem occured in a so called improved C64 ! Think i`ll stick with using the old breadbin, the picture is really superb. Not sure really exactly what my cable is, all I know is that it was from a seller on ebay and seems pretty well made with quality cable - C64 video to scart. Is it possible to swap the mainboard out of a breadbin into a c64c so getting good picture and nicer keyboard ?

06 March 2009, 08:42	#10
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Sorta. The keyboard mounting brackets might not be compatible with the old motherboard.. You'll have to use your imagination when modifying them.

06 March 2009, 19:43	#11
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	I had issues with a lousy display. A lot of the cables that are out for the C64 don't seem to be shielded all that well or are old so i decided to mod my C64. so i can use regular composite cables for both audio and video. Heres a pic. (the cable coming out of the back is just a test cable). The Yellow and white RCA jacks are the A/V outputs.

15 December 2011, 20:01	#12
Retroplay Lemon Curry ? Join Date: Sep 2004 Location: Denmark Age: 49 Posts: 4,080	Apparently it can be fixed just take a look at this. http://www.lemon64.com/forum/viewtopic.php?t=40570 Sadly I can't find the schematic to build it as I would love to do this fix on my C64c.

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