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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: spaceman88 on January 09, 2012, 05:10:19 PM
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I got this monitor when I bought 3 Amiga's a while ago. When I hooked it up to my MacBook it worked OK, but when I connected it to my A1200 (NTSC, 15kHz) the picture rolled very fast and wouldn't lock on. My first guess would be bad capacitors but before I spend too much time trying to fix it, does this monitor also support Amiga PAL modes? Model # is JC-1404 HMA.
Thanks
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The spec sheet states it goes from 50-90 Hz vertically, so it should work in NTSC and PAL both.
Have your tried a 31 kHz mode? What kind of sync does your cable/adapter support?
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I didn't try 31 kHz with the A1200 (the MacBook is 31kHz). I'm using one of the old Commodore 23 pin to 15 pin adapters (390682-03)
The spec sheet states it goes from 50-90 Hz vertically, so it should work in NTSC and PAL both.
Have your tried a 31 kHz mode? What kind of sync does your cable/adapter support?
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I used to own one of these way back - brilliant monitor for its time. But no, it does not display standard 15k signals. You need a scandoubler to use it on A500/A2000. About the A1200 and its 31k signal I'm not sure but basically (from memory) unless you can generate a proper 50 or 60Hz signal, the 3D wont pick it up.
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BBoAH entry (http://www.amiga-resistance.info/bboahfaq/index.php?action=artikel&cat=66&id=2893&artlang=en) says it should support 15KHz.
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I used to own one of these way back - brilliant monitor for its time. But no, it does not display standard 15k signals. You need a scandoubler to use it on A500/A2000. About the A1200 and its 31k signal I'm not sure but basically (from memory) unless you can generate a proper 50 or 60Hz signal, the 3D wont pick it up.
I still have one in use, and it works fine at 15KHz! I never use PAL modes, so I can't speak to that - but looking at the specs, it should.
This is still a good choice for many Amiga models. I good technician can bring these back to life - usually...
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I didn't try 31 kHz with the A1200 (the MacBook is 31kHz). I'm using one of the old Commodore 23 pin to 15 pin adapters (390682-03)
@spaceman
the commodore adaptor you're using is for the toaster sync...
That's why it's rolling.
use the 390682-01 adaptor instead (without a toaster)
M
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I can confirm that the 3d does display PAL modes fine, looks like SACC-guy found the real problem, but, just for the record :-)
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I had one: it supports PAL 15khz no worries, but it scanlines are far more visible than on a 1084
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@spaceman
the commodore adaptor you're using is for the toaster sync...
That's why it's rolling.
use the 390682-01 adaptor instead (without a toaster)
M
Hello,
I had two adapters and apparently I grabbed the wrong one! I tried the -01 and it worked fine in both NTSC and PAL. Thanks for the help. BTW if I use the -03 adapter on my A4000 Toaster setup will the NEC work? Is there a sync signal that comes from the toaster and ends up at the video port? Anyways, thanks for the info.
Len
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I had one: it supports PAL 15khz no worries, but it scanlines are far more visible than on a 1084
It's resolution is far better than the 1084's, resulting in thinner scan lines that show intermediate black lines. This is even more apparent on an EUM 1491.
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Hello,
I had two adapters and apparently I grabbed the wrong one! I tried the -01 and it worked fine in both NTSC and PAL. Thanks for the help. BTW if I use the -03 adapter on my A4000 Toaster setup will the NEC work? Is there a sync signal that comes from the toaster and ends up at the video port? Anyways, thanks for the info.
Len
@spaceman
Yes, the nec multisync with work with the toaster thru a 390682-03.
The toaster grabs the timing (or some such)
M