Search found 483 matches

by Martin_Head
Wed Jan 29, 2020 10:36 am
Forum: Software & Programming
Topic: QLiberator decompiler
Replies: 130
Views: 6514

Re: QLiberator decompiler

Back to Disk Mate 5. I got a bit side tracked, and forgot that I had not posted the decompiled sources for Disk Mate 5. The zip file contains the original Disk Mate 5.10 source, and my version 5.11 which has the reference to the FileInfo 2 command 'FEX' changed to FI2_CALL. And so need s FileInfo 2,...
by Martin_Head
Tue Jan 28, 2020 11:26 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

Now that I"m running off of NTSC color composite, the picture is better than RF. At least some of the artifacts do go away (like most of the shimmering). It still has the shadow effect where, for colors, the image is echoed a millimeter or two to its right (and there is no adjustments on the m...
by Martin_Head
Mon Jan 27, 2020 10:45 am
Forum: Hardware
Topic: Microdrive failure after felt pad detaches - ideas?
Replies: 5
Views: 171

Re: Microdrive failure after felt pad detaches - ideas?

I know you say that the tape head looks clean. But try cleaning it with a tape head cleaner, or isopropyl alcohol. It may be that some dirt you cannot see is stuck to the head.
by Martin_Head
Mon Jan 27, 2020 10:27 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

All those resistors tacked onto the board under the video socket is not normal on a UK QL. It may be that a previous owner has tried to reduce the 5 volt RGB signals to 1 volt signals. Which are required by some monitors or TV's. This is usually done by a couple of resistors in each line in a QL RGB...
by Martin_Head
Sat Jan 25, 2020 11:03 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

When I use pin 9 of the MC1377 and ground off of the RGB connector (pin 2) I seem to get a color PAL composite signal (when using the composite connector on the TV, my TV seems to briefly display what type of composite input it gets) that basically looks pretty close (as crappy) to my RF signal -- ...
by Martin_Head
Fri Jan 24, 2020 11:05 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

When I jumped the MC1733 on pin 9, that's when I got the weird behavior of getting a color picture in composite that wasn't that much better than the color RF one I get. The only other weirdness is that my monitor said it was PAL. As Martin pointed out, perhaps my monitor was doing something weird ...
by Martin_Head
Thu Jan 23, 2020 10:12 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

I was wondering if your QL was generating a PAL signal, instead of an NTSC one. That's why I suggested checking the resistance of pin 20 of the MC1377 to ground. If it's not a short circuit, then the MC1377 would be generating a PAL signal, which I don't expect an NTSC television would be very happ...
by Martin_Head
Wed Jan 22, 2020 10:52 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

I had a look at the data sheet for the MC1377. And it says that pin 20 of the chip should be connected to ground for NTSC and left floating for PAL. You might want to check with a multi meter that it is grounded. In case it is actually working in PAL which would cause you problems. Also check the X...
by Martin_Head
Tue Jan 21, 2020 10:37 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

I had a look at the data sheet for the MC1377. And it says that pin 20 of the chip should be connected to ground for NTSC and left floating for PAL. You might want to check with a multi meter that it is grounded. In case it is actually working in PAL which would cause you problems. Also check the Xt...
by Martin_Head
Mon Jan 20, 2020 10:27 am
Forum: General QL Chat
Topic: Help with Composite out
Replies: 32
Views: 890

Re: Help with Composite out

Maybe you have a fault in the colour modulator circuit of the MC1733. This may not effect the black and white signal. it's a cheap Walmart monitor that has every connection imaginable in the US: VGA, HDMI, Component, Composite, and RF By component do you mean RGB. If so, can you use that instead. Yo...