Search found 531 matches

by Martin_Head
Mon Jan 27, 2020 10:45 am
Forum: Hardware
Topic: Microdrive failure after felt pad detaches - ideas?
Replies: 7
Views: 767

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: 55
Views: 5879

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: 55
Views: 5879

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: 55
Views: 5879

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: 55
Views: 5879

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: 55
Views: 5879

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: 55
Views: 5879

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: 55
Views: 5879

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...
by Martin_Head
Mon Jan 20, 2020 9:57 am
Forum: Software & Programming
Topic: QLiberator decompiler
Replies: 172
Views: 15496

Re: QLiberator decompiler

Oh, 3 seconds compared to Martin 's 2 hours with Qemulator? Can't understand this. What's about those Turbo lines? You should use a clean OS, without any extensions. I only have the unregistered Qemulator. So only normal QL speed, and so no floppy disk images, or QXL.WIN file support. And I was usi...
by Martin_Head
Sun Jan 19, 2020 10:32 am
Forum: Software & Programming
Topic: QLiberator decompiler
Replies: 172
Views: 15496

Re: QLiberator decompiler

If the line number table doe's not exist, then the decompiler will produce single statement lines, as it does not know where lines start and end. It also has to 'make up' a line number. This made up line number is comprised of an offset from the start of the program, +100. This can cause line numbe...