26 May 2005, 0:36 UTC in projects
New CRT, new board, same software...
9 May 2005, 1:58 UTC in software
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
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.
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.
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.
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.
17 April 2005, 15:47 UTC
Displaying a message, even.
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