A Brand new Floppy Emulator

[alexh]

Interesting stuff... they seem to have given it composite video output (Eh??) and a joystick input to control it.

I still think that using a default disk image and using the host computer to control disk selection is the way to go.

I wonder what is at the heart of the design?

[alexh]

I was just curious as to why it was composite output and not RGBS? Does the atmega32 have composite out?

[alexh]

I'd like to see what horsepower and minimum clock speed you would need to generate a colour composite video signal using only a micro controller and one I/O.

Perhaps with a 120MHz microcontroller and using 100% cpu power you *might* do it.

Video encoders are quite complex beasts.

B&W might be easier.. but we're still taking reasonable amounts of CPU power to time everything to 27MHz.

[alexh]

Generating the CSYNC timing marks and Luma & Chroma modulated data using nothing but the CPU and a timer?

You sure?? Cool.

[alexh]

The microcontroller demo doesn't use encoded outputs, it has separate RGBHV but still very cool.

20MHz to do the sound and gfx including sync... v cool.

Yes it's B&W ! Additionnaly 27Mhz is too much to display an 320*200 picture!

Yeah, I know. It's the SDTV natural frequency.