Author Topic: monitor safe region  (Read 3377 times)

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Offline arnoldemu

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monitor safe region
« on: 12:23, 10 December 12 »
I am writing a game in overscan, and I want to know what the safe region is, the area that is visible on all Amstrad monitors.

So, to help me, and to help others who want to make overscan games, please run this program and take a photo of your monitor.

http://www.cpctech.org.uk/safezone.dsk

I would like photos from all cpc monitors (ctm644, cm14, gt64, and I also welcome results from televisions and the similar).

The aim is to know what is the minimum rectangle on the screen that can be seen on all, and also what is the maximum potentially. Graphics can then be placed so they are visible on all.

Thank you for your help.
 
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Offline TotO

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Re: monitor safe region
« Reply #1 on: 12:50, 10 December 12 »
Some monitors get H and V alignement problem that can be fixed by recentering the picture after opening the monitor.
So, I'm sure that doing the test will not show more than a 46x32 chars area for all peoples. :) 
R-Type overscan screen was a "46x33" 24K screen and I got the bottom eat a bit.

(I can't test it on my CPC for now, sorry)
« Last Edit: 13:19, 10 December 12 by TotO »
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Offline Devilmarkus

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Re: monitor safe region
« Reply #2 on: 13:00, 10 December 12 »
For me it looks like this:

 [ Invalid Attachment ]

Spoiler: show
Just kidding, couldnt resist ;)
Sorry, cannot transfer it to 3" :(
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Offline Bryce

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Re: monitor safe region
« Reply #3 on: 13:09, 10 December 12 »
Unlocking topic. I assume this was locked by mistake?

Bryce.

Offline Devilmarkus

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Re: monitor safe region
« Reply #4 on: 13:11, 10 December 12 »
Yeah strange things happen...
During my reply, it sent me to "move topic"

Well, informed Gryzor about this...

Now back to topic ;)
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Offline Bryce

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Re: monitor safe region
« Reply #5 on: 13:49, 10 December 12 »
Yeah strange things happen...
During my reply, it sent me to "move topic"

Strange, that happened to me recently too, but I thought I'd accidentally hit the wrong button, so I ignored it.

Bryce.

Offline arnoldemu

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Re: monitor safe region
« Reply #6 on: 16:10, 10 December 12 »
is this javacpc? Yes, it has come this far that I can't tell if this is javacpc monitor emulation or a real image...
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Offline Devilmarkus

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Re: monitor safe region
« Reply #7 on: 16:12, 10 December 12 »
is this javacpc? Yes, it has come this far that I can't tell if this is javacpc monitor emulation or a real image...

Sure its JavaCPC (But it indeed shows almost the same area like my CTM 644)

I guess, you didn't read my "Spoiler" :D
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Offline SyX

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Re: monitor safe region
« Reply #8 on: 22:43, 10 December 12 »
Take a look to this thread in the spanish forum, i asked for the same a few years ago and we had very interesting results :)

Offline MaV

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Re: monitor safe region
« Reply #9 on: 16:49, 23 January 13 »
Thread necromancy ... (rise, RISE, evil creature of the night! Muahaha!)


@arnoldemu: Would you still like pictures? I could try this evening on a GT-65-2, CTM640, and CM14.
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Offline ralferoo

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Re: monitor safe region
« Reply #10 on: 23:56, 23 January 13 »
My 464 with CTM640 (and also apparently bad convergence in the top right): http://ranulf.net/fpga/IMG_9946.JPG

My FPGA emulator on an LCD monitor (widescreen, but displaying in 4:3 mode): http://ranulf.net/fpga/IMG_9948.JPG (ignore the bogus data on the screen... looks like the boot code I used to bootstrap it with!)

Offline ralferoo

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Re: monitor safe region
« Reply #11 on: 00:14, 24 January 13 »
IIRC, my monitor shows more on the left than WinCPC and WinAPE and less vertically. I was quite surprised at the time.

The image on the LCD from my FPGA might move a bit though as I'm not entirely sure it's just right yet. It was basically set so that with my sugarlumps demo I didn't get phantom dots appearing on the left - you can't see them on a real CPC monitor or emulator, but they were just poking through until I delayed my HSYNC by 1us. These were artifacts of having R1>R0 to repeat lines and seeing some of the next line shown on the left before the CRTC resets that character count to 0 and was visible on a real monitor if the HSYNC was an extra character early too. But as a result, the standard CPC boot screen with a border is ever so slightly a couple of pixels to the left of dead centre of the 4:3 zone of my LCD.

That said, the LCD image shows about 26 characters on the left of the crosshairs, 23 to the right. The real monitor is about 24.5 and 22 in the middle.

Offline MaV

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Re: monitor safe region
« Reply #12 on: 19:43, 24 January 13 »
Here's my three monitor pictures. One thing I've noticed with CTM-monitors is that they begin to show a convergence (if that is the right word) particularly in the upper border area in overscan mode. This is more easily noticeable while scrolling, like Exin's picture of the woman lying in bed in the Wake Up! demo.
So far I've seen that effect on three different CTM-monitors.
The CM14 also shows signs of ageing - if that is what I suspect.

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Offline arnoldemu

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Re: monitor safe region
« Reply #13 on: 11:26, 25 January 13 »
Thread necromancy ... (rise, RISE, evil creature of the night! Muahaha!)


@arnoldemu: Would you still like pictures? I could try this evening on a GT-65-2, CTM640, and CM14.
yes of course.

the more the better.
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Offline beaker

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Re: monitor safe region
« Reply #14 on: 13:53, 25 January 13 »
This is on my plasma via scart.

Offline ralferoo

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Re: monitor safe region
« Reply #15 on: 16:05, 25 January 13 »
This is on my plasma via scart.
At a guess from this picture, I'd suspect you also have "overscan" mode enabled on the TV, which confusingly enough removes then overscan area (about 10%)... Annoyingly, I lot of TVs default to this mode whenever they're turned on...  >:(

Offline beaker

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Re: monitor safe region
« Reply #16 on: 17:07, 25 January 13 »
Urgh, tell me about it... I've got the same problem with my PC via HDMI. I've can't find any settings in the menu of the Pioneer plasma and using the nvidia driver on windows 7 to do the compensation only seems to work on windows and not the games  >:( Otherwise it's a bloody nice TV for watching films and playing xbox 360 games on.

I need to look through the manual and see if there's hidden menu options anywhere...

Edit: Ah balls - just been reading a FAQ on the TV and there's no overscan compensation as it's a "limitation" of the hardware. Also the manufacturer suggests the TV will last 60,000+ hours or 14 years @ 12 hours per day. I work from home and have it on every day and only notched up 8,700 hours over 6+ years. It's just about run in I guess.... and I thought modern technology only had a 5 year life these days  :laugh:

So the solution, anyone know if the later model Sony Trinitron CRT models (the silver flat screen ones) have this issue or if I'd be better buying a monitor for the CPC?
« Last Edit: 01:39, 26 January 13 by beaker »