9 May 2005, 1:58 UTC in software
Software for a virtual terminal and several other toys
vgaxy -- create XY scope displays with your VGA card
Software for a virtual terminal and several other toys
9 May 2005, 1:57 UTC in software
With this patch applied, xmame 0.94 does vgaxy-style output for display on an oscilloscope in xy mode
Vector patches for xmame 0.94
With this patch applied, xmame 0.94 does vgaxy-style output for display on an oscilloscope in xy mode
7 May 2005, 19:32 UTC
I really should mention the website of Jed Margolin which has a lot of information about his time at Atari, including his work with vector games.
More vector game screenshots
I really should mention the website of Jed Margolin which has a lot of information about his time at Atari, including his work with vector games.
1 May 2005, 20:36 UTC
By switching between two values in adjacent pixels, the voltage seen at the scope is an intermediate value between the two.] For instance, to display a pixel at X=128.5, alternate between blue=128 and blue=129. This happens because the pixel clock is faster than the bandwidth of the rest of the system---in particular, this signal is at about 75MHz, while the scope has a "20MHz bandwidth limit" button.
"Dithered" output increases resolution
By switching between two values in adjacent pixels, the voltage seen at the scope is an intermediate value between the two.] For instance, to display a pixel at X=128.5, alternate between blue=128 and blue=129. This happens because the pixel clock is faster than the bandwidth of the rest of the system---in particular, this signal is at about 75MHz, while the scope has a "20MHz bandwidth limit" button.
So without complicated extra hardware, I've got a nice 512x512 output, which gives me a 64x48 character vector terminal. It's a lot more readable than this screenshot makes it appear. 768x768 (a 3-pixel ordered dither @ 50MHz) and 1024x1024 (4-pixel, 37MHz) dithered resolutions may also work. Watch this space.
1 May 2005, 18:16 UTC
Yep, it works. Too bad about the low resolution. More game pictures below the fold.
MAME vector display on the oscilloscope
Yep, it works. Too bad about the low resolution. More game pictures below the fold.
29 April 2005, 1:04 UTC
With a simple transistor, the Z axis works pretty well. The linearity is better now that I'm using some 10b2 tees and terminators (50 ohms) on the X and Y inputs, too.
Working Z-axis
With a simple transistor, the Z axis works pretty well. The linearity is better now that I'm using some 10b2 tees and terminators (50 ohms) on the X and Y inputs, too.
17 April 2005, 2:33 UTC
Animated XY display
16 April 2005, 16:53 UTC
VGA to 'scope display
29 March 2005, 23:57 UTC
TI serial-interface DAC
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