Ratiofix! v2.0

Ratiofix!, the tool to calibrate your monitor, has been updated to v2.0. Ratiofix! is based on Philips PM5544 television test pattern, a world wide used generator for television. With this generated test-pattern you can adjust your television/monitor settings for perfect horizontal and vertical stretch and color.

This is a fully new version that works in two modes

SCREEN5 for MSX2 systems
SCREEN10/11 for MSX2+ systems

The television test pattern was improved to get a perfect circle in NTSC mode.

You can find RatioFix!v2 on KdL his homepage, or use the direct link

Relevant link: KdL's website

Comments (11)

By andrea.denara

Expert (73)

29-07-2016, 11:15

I would add a note about msx1 screen:

On msx, pixel are not square, the ratio is 7/5, so the best resolution to see msx screen on LCD should be

1792 x 960 (256*7 x 192*5)

with this res we have 7 Horizontal pixel for 1 msx Horizontal pixel and 5 Vertical pixel to for 1 msx Vertical pixel.
I think this is a good value for emulators and fit good for FHD res (1920 x 1080)

So, I ask to emulators developer to include this res (1792 x 960) as a choice.
Think about this res can also minimize the output for emulation due the easy rescale factor and you can use 1 of the 5 vertical pixel to simulate scanlines.

By sd_snatcher

Prophet (3659)

30-07-2016, 06:55

Quote:

On msx, pixel are not square, the ratio is 7/5

Do you mean on 60Hz (NTSC, PAL-M) or 50Hz (PAL/most PAL derivatives/SECAM)?

By andrea.denara

Expert (73)

30-07-2016, 15:30

I'm sure of 7/5 ratio pixel about european msx.

By Marq

Champion (387)

30-07-2016, 22:50

On one old TV a SVI-738 displayed a rather "widescreen" 2:1 image The first L!T demos (all PAL) were made based on fMSX's square pixels, but the end result was definitely squashed. Later I've used an estimate of 5:3 for the visible area of the screen, as opposed to 4:3, but that's just a guesstimate.

By andrea.denara

Expert (73)

31-07-2016, 08:28

The 1.4 value (7/5) is not estimated!
This is the default value for european msx.
Look this Guide
at pag 133.
There's also other manuals that report this value.

By Marq

Champion (387)

31-07-2016, 22:41

But where does that number come from? And is it even uniform across different MSXs?

By Marq

Champion (387)

31-07-2016, 23:06

Ookkay, I set my video monitor so that the MSX image borders barely fit inside the frame. At least on a Canon V-20 that 7/5 pixel aspect ratio seems to be very close to the output (the measured image is only 2% narrower than it "should" be). In terms of a 4:3 monitor the SCREEN 2 addressable picture aspect ratio is then around 5.6:3. Almost the same as a modern 16:9 widescreen

By Marq

Champion (387)

01-08-2016, 11:20

As a sidenote, even with the maximum distortion (set horizontal_stretch 256) openMSX still shows a narrower image than the real Canon V-20: 256x192 pixels' ratio is about 1.66 as opposed to 1.866.

By KdL

Paragon (1452)