The Propeller TV driver claims to do PAL.
Have you tried it?
'' tv_mode
''
'' bit 4 selects between 16x16 and 16x32 pixel tiles:
'' 0: 16x16 pixel tiles (tileheight = 16)
'' 1: 16x32 pixel tiles (tileheight = 32)
''
'' bit 3 controls chroma mixing into broadcast:
'' 0: mix chroma into broadcast (color)
'' 1: strip chroma from broadcast (black/white)
''
'' bit 2 controls chroma mixing into baseband:
'' 0: mix chroma into baseband (composite color)
'' 1: strip chroma from baseband (black/white or s-video)
''
'' bit 1 controls interlace:
'' 0: progressive scan (243 display lines for NTSC, 286 for PAL)
'' less flicker, good for motion
'' 1: interlaced scan (486 display lines for NTSC, 572 for PAL)
'' doubles the vertical display lines, good for text
''
'' bit 0 selects NTSC or PAL format
'' 0: NTSC
'' 3016 horizontal display ticks
'' 243 or 486 (interlaced) vertical display lines
'' CLKFREQ must be at least 14_318_180 (4 * 3_579_545 Hz)*
'' 1: PAL
'' 3692 horizontal display ticks
'' 286 or 572 (interlaced) vertical display lines
'' CLKFREQ must be at least 17_734_472 (4 * 4_433_618 Hz)*
''
Hi Perry. Normally all TV drivers on Propeller are for NTSC. Np problem as long TV display supports both modes.
NTSC and PAL. But I have some very nice 7'' TV displays that only support PAL. And them cant display colors on Drivers available in OBX that are vriten for NTSC.
Hi Perry. Normally all TV drivers on Propeller are for NTSC. Np problem as long TV display supports both modes.
NTSC and PAL. But I have some very nice 7'' TV displays that only support PAL. And them cant display colors on Drivers available in OBX that are vriten for NTSC
For every stupid question there is at least one intelligent answer.
.
You should be able to use the NTSC driver, just change the color burst frequency to 4.43361875MHz and remember that the colors will be off by 90 degrees. You may also have to change the timing slightly.
You should be able to use the NTSC driver, just change the color burst frequency to 4.43361875MHz and remember that the colors will be off by 90 degrees. You may also have to change the timing slightly.
I don't think that would work. PAL does a phase flip every other line. PAL works on the Propeller.
My next suggestion would be to put a 100 ohm resistor to ground on the video output. The standard Paralax reference circuit does not properly match 75 ohm impedence.
Ok, you have me interested. I do not have any displays that are PAL capable.
How is this phase flip done? I would like my code to work, and I am trying to match the PAL as I understand it, I am testing the NTSC side.
Reading the PAL standards documents that I have (in books), I do not see any thing about phase alternating per line, on the other hand I do see this in the SECAM standard, is this what you are referring to?
One of the problems we now have is to find a PAL only monitor. My TVs with composite inputs are primarily PAL (Australia) they also do NTSC. My oldest TVs are over 10 years old.
One of the problems we now have is to find a PAL only monitor. My TVs with composite inputs are primarily PAL (Australia) they also do NTSC. My oldest TVs are over 10 years old.
Sapieha
Posts: 2,964
Comments
Have you tried it?
NTSC and PAL. But I have some very nice 7'' TV displays that only support PAL. And them cant display colors on Drivers available in OBX that are vriten for NTSC.
http://forums.parallax.com/showthread.php?99657-Spintris-NTSC-PAL-video-game-for-Propeller
Have you tried setting the PAL bit?
I don't think that would work. PAL does a phase flip every other line. PAL works on the Propeller.
My next suggestion would be to put a 100 ohm resistor to ground on the video output. The standard Paralax reference circuit does not properly match 75 ohm impedence.
How is this phase flip done? I would like my code to work, and I am trying to match the PAL as I understand it, I am testing the NTSC side.
somebody here in the forum was tweaking the PAL-driver and had success. But I don't remember who it was.
best regards
Stefan
http://forums.parallax.com/showthread.php?100191-Fellow-PAL-Prop-ers-rejoice-)&highlight=pal60