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09 January 2009, 23:22
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#1 |
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Posts: n/a
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B/W on A1000 composite out
I have an Amiga 1000 Rev. A. I have always believed that this is one of the early models sold with NTSC on the composite (and the fact that this is a Rev. A should support this, no?), but when I hook it up to a NTSC compatible TV, the image is still B/W with black vertical lines on certain colours.
I'm wondering if machine is defective, but as I remember, the signal was always like this on the composite (I just didn't have a TV that could handle NTSC.) Anyone have any idea on what's causing this? |
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09 January 2009, 23:41
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#2 | |
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Registered User
Join Date: Sep 2008
Location: Germany
Posts: 331
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Quote:
Give it a try on a monitor with fbas input (philips cm8833 or so) 
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10 January 2009, 00:20
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#3 |
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Posts: n/a
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Yeah, don't really have any other option than this TV...
It can handle 50/60hz & 60hz w/PAL colour. Found this snippet online: "'early board', with a daughterboard mounted pickaback the mainboard ('piggyback'). Has color composite video output" Which suggest that I should have colour. |
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10 January 2009, 05:52
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#4 |
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I hate potatos and shirts
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 58
Posts: 3,482
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Yeah, you will... In NTSC!
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10 January 2009, 16:34
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#5 |
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Posts: n/a
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Sweet! My TV handles NTSC. Why don't I get colour?
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10 January 2009, 17:02
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#6 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,534
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A1000 schematics are not easy to read (crappy scan quality as usual..), but it seems MC1377 (PAL/NTSC composite video color encoder) clock pin is connected to some system clock signal (which is also different in PAL/NTSC..) resulting in wrong clock and badly timed NTSC color signal. (just a guess..)
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10 January 2009, 17:10
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#7 |
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Posts: n/a
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Aha, so Commodore messed this up when rushing Amigas to the PAL market? - Ok, nothing to be done about it then.
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