On Mon, 13 Jan 2020 20:59:40 +0100, Peter Graf via Ql-Users wrote:
> Thanks for trying it with the Q60. If it nicely converts the Q60 signal,
> that would be a big point despite the very high price.

Well, everything is relative... You can find a built OSSC with its remote
and power supply for 160-180 euros. Given the amount of money I spent in
the QL hardware over years (not counting 2 scan converters that never
worked properly and costed as much), that's peanuts to keep that costly QL
hardware usable in the coming years (and till it dies... or I do). :-D

> Is the native resolution of your monitor 1920x1080?

I tested it on a 1680x1050 LCD monitor (Hyundai W220D) and on a
1920x1200 one (Eizo FlexScan EV2455).

The photos were taken with the W220D (that is likely to get dedicated to
the task when my last CRT will die, the other, newer LCD monitor being
used with my PCs).

In the case of the Q60, the OSSC must be configured to output a 480p HDMI
video, but the actual HDMI resolution can be set to either 980x512 or
1960x1024 (via scan doubling on the OSSC side; an equivalent result may
be obtained with picture scaling by the monitor, but I prefer to keep my
monitors in 1:1 mode, i.e. without scaling at all). The sampling must be
increased to 1200 pixels per line and the H/V back-porch and delays must
be appropriately adjusted to get the Q60 screen to fit the HDMI frame.

> The published Q60 screen appears a little blurred, but that might be a
> matter of taking the photo. A close-up would be interesting.

The photo I published was probably a tiny bit blurry, but the blur is
indeed also the result of a scaling (the lines doubling is not a problem
but there are actually 980 pixels per HDMI video line where the Q60
displays 1024).

Here are two new photos (full resolution, untouched: 30Mb each !) in DNG
format, with and without scan lines doubling:

Without scan lines doubling, only a small portion of the screen is used,
of course (in 1:1 monitor mode, and scaling at the monitor level gives
the same result as with scan lines doubling at OSSC level), but looks
almost pixel-perfect (and actually better than on my CRT monitor, which
thinks the Q60 video signal is 640x400).

Note that the screen looks much nicer when seen with your eyes than on
the photos (you won't see the monitor pixels when your eyes at 50cm of
the screen, while the camera got them all); for example, the blue strip
of the QPAC2 "Things" window looks perfectly smooth when seen with your

Frankly, I'm quite satisfied with the result, even if it won't match what
could be done (without the need for a scan converter) with a native 800x600
mode on the Q60... ;-P

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