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BlockABoots wrote:Can some explain what the revisions of this I/O board changed?
I can get a version 5.3 but i know theres now the 5.5 boards out but not sure whats change and different?
kinox51 wrote:BlockABoots wrote:Can some explain what the revisions of this I/O board changed?
I can get a version 5.3 but i know theres now the 5.5 boards out but not sure whats change and different?
Hey BlockABoots, you can look into the "HW Installation instruction"-thread. In the .pdf-File are the differences mentioned.
http://www.atari-forum.com/viewtopic.php?f=117&t=34473
atmn wrote:Got a question regarding the I/O board.
Assembled one and get it to work, Im very pleased.
Was about to try the VGA port, it worked well on my monitor. got a 640x480 out.
Isnt it possible to get a 15kHz signal to be able to connect to a old tube-tv, maybe get RGB and composite out? Or isnt it compatible at all on that area?
JimDrew wrote:Sorgelig,
I was looking over the v5.5 I/O board and noticed that you connected pin 10 of GPIO 1 to ground. That pin is normally GPIO_1[9] PIN_ AH 27. Is there a reason you connected it to ground?
Sorgelig wrote:Yes. It tells to cores to enable VGA output.
JimDrew wrote:Ok, so the VGA output is strictly 15Khz?
JimDrew wrote:Also, how close if your R2R ladder for the VGA proper colors? It's not perfectly linear based on the resistors you used, but I wonder if it is worth the added expense to make it perfectly linear - or if you adjust the colors in the cores to compensate for this?
JimDrew wrote:Please take a look at SW4 in your schematic for v5.5 I/O board (probably other versions are the same as well). You have the connections 4 and 6 swapped compared to the PCB and the data sheet for the switch.
JimDrew wrote:Where is the "scan doubler" option? I don't see anything in the menu that allows changing the frequency.
Sorgelig wrote:Color resistors are not strictly correct for high precision, but enough for hobbyist project. VGA strictly speaking is for debugging purpose while main video output is HDMI. VGA is 18bit while HDMI is 24bit.
Sorgelig wrote:Most cores have Scandoubler FX option. Does the name "scandoubler" gives some hint?
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