Search found 60 matches

by stephen_usher
Mon Apr 08, 2019 10:19 pm
Forum: Hardware
Topic: RGB to SCART Video * solved *
Replies: 13
Views: 589

Re: RGB to SCART Video * solved *

You could think of the TTL signal as a three line parallel digital signal but that's not how the TV/monitor sees it as it's treated as three sets of analogue signals. These are then put through an A-to-D converter. Scan line synchronisation could be an analogue circuit like old monitors or it could ...
by stephen_usher
Sun Apr 07, 2019 10:13 pm
Forum: General QL Chat
Topic: Neat QL Brochure
Replies: 4
Views: 273

Re: Neat QL Brochure

I think I got that pamphlet before I got the QL. What I noticed was that the QL printed on the front (when folded out) was life size, which nicely showed how big the QL was. I think I still have two copies around. I don't know if a similar pamphlet was used in the UK, but this one was written for t...
by stephen_usher
Sun Apr 07, 2019 10:08 pm
Forum: Hardware
Topic: RGB to SCART Video * solved *
Replies: 13
Views: 589

Re: RGB to SCART Video * solved *

If you try and OSSC, which does cost a lot more but is worth it, it's better than you'd get with a TTL RGB display. That would be a magical transformation indeed. Even higher fidelity than the original. That's easy, CRTs smear sideways due to the speed at which the beam can switch on and off and ar...
by stephen_usher
Sun Apr 07, 2019 10:28 am
Forum: Hardware
Topic: RGB to SCART Video * solved *
Replies: 13
Views: 589

Re: RGB to SCART Video * solved *

I have tried OSSC. The picture I get with a cheap Chinese scaler on a cheap Chinese PC is way better than from OSSC together with an expensive NEC Multisync - So your mileage may vary. It is, however, a bit of a lucky game with the Chinese scalers whether you get them to work properly with your spe...
by stephen_usher
Sun Apr 07, 2019 9:24 am
Forum: Hardware
Topic: RGB to SCART Video * solved *
Replies: 13
Views: 589

Re: RGB to SCART Video * solved *

Those cheap scalers are OK, though it depends upon the TV as to whether they will display the extra characters, most don't. As for scalers being "fuzzy", well the cheap ones (which are really designed for video) do rubbish interpolation and also erroneously sharpen the image, so they don't...
by stephen_usher
Tue Apr 02, 2019 10:30 pm
Forum: Hardware
Topic: WD1772 vs DP8473V
Replies: 8
Views: 413

Re: WD1772 vs DP8473V

If you want HD then the 1772 can be overclocked to 16MHz to do this, as used in the Atari TT030.
by stephen_usher
Mon Apr 01, 2019 6:22 pm
Forum: Hardware
Topic: Issue 8 discussions...
Replies: 55
Views: 2703

Re: Issue 8 discussions...

To be specific, would it be possible to replace the RF out with a standard VGA port? Obviously keeping the QL standard 512x256 @ 4 (or 8) colors. You'd have to create a scan doubler. Given that VGA is getting rare now you might as well go the whole hog and create an HDMI output. You could probably ...
by stephen_usher
Mon Mar 18, 2019 6:58 pm
Forum: Hardware
Topic: SGC successor brainstorming
Replies: 89
Views: 7946

Re: SGC successor brainstorming

Lithium coin cells do burst and leak but I've only ever seen this once and it's extremely rare. This is totally unlike the NiMH and NiCd rechargables or the half-AA lithium batteries which seem to eat through their casings very quickly.

Coin cells are by far the best solution.
by stephen_usher
Sun Mar 17, 2019 9:21 am
Forum: Hardware
Topic: Atari TT030 QVME
Replies: 8
Views: 437

Re: Atari TT030 QVME

The TT's video sub-system is very different from the MSTE's. Could the system be trying to switch to TT-High resolution, which is not VGA compatible? Have you tried starting SMSQ/E when running in ST-High resolution? I must admit that I tried running the latest SMSQ/E on my TT and the display didn't...
by stephen_usher
Sun Jan 27, 2019 9:21 am
Forum: Software & Programming
Topic: QDOS-GCC How to run the binaries?
Replies: 11
Views: 776

Re: QDOS-GCC How to run the binaries?

PS. Ignore the Perl script. If there are no instructions, it's unlikely the code could be read and understood, even by the authour! Perl is a 'WORN' language. Write Once Read Never! :D Bah! That depends upon the programmer. Some write Perl which looks like line noise, others as a clear, structured ...