Hmmmm so...
Given that eviltim has shown us how to force a TTL monitor to display analog levels, by hijacking the gain pot:
... and given that many of these cheap ARM sticks have at least one analog and/or PWM output pin, mayyyyybe with a bit of tweaking of sprite's GPU, you could get greyscale.
[does math]
512 x 342 x 60Hz = 10506240 = just over 10MHz (plus some over for blanking intervals &c)
Getting that kind of speed out of the DAC/PWM on a cheap micro is unlikely, though possibly worth investigating - remembering of course, that it also multiplies your data handling requirements by whatever bit depth you choose (ie, 8 bit greyscale = 8 times as much data)
You could, in theory, use digital pins and an R2R ladder - ie, each pin addresses one bit of your greyscale level, in parallel.
I wonder ... the R-Pi has GPIO pins itself.
/chinscratching and hmmm
Given that eviltim has shown us how to force a TTL monitor to display analog levels, by hijacking the gain pot:
... and given that many of these cheap ARM sticks have at least one analog and/or PWM output pin, mayyyyybe with a bit of tweaking of sprite's GPU, you could get greyscale.
[does math]
512 x 342 x 60Hz = 10506240 = just over 10MHz (plus some over for blanking intervals &c)
Getting that kind of speed out of the DAC/PWM on a cheap micro is unlikely, though possibly worth investigating - remembering of course, that it also multiplies your data handling requirements by whatever bit depth you choose (ie, 8 bit greyscale = 8 times as much data)
You could, in theory, use digital pins and an R2R ladder - ie, each pin addresses one bit of your greyscale level, in parallel.
I wonder ... the R-Pi has GPIO pins itself.
/chinscratching and hmmm