sotomajor  writes:

> It’s the HDMI so far, as we have chosen to make it more than just
> HDMI. The VGA and RGB outputs present on the Spectrum Next are
> produced by the ULA (in our case, the ULAplus) chip originally
> powering the Speccy. That’s not compatible with HDMI, as one would
> imagine. So we took a Raspberry Pi Zero and connected it via GPIO to
> the Next’s expansion port, and monitor the video RAM area for any
> changes. When these changes happen, we copy them over to the Pi’s
> framebuffer and update what the Pi is outputting via HMDI.

Very interesting. I think a similar setup could work with a C64, through
the expansion port for example. Although I guess it's a little easier on
the Spectrum, at least no sprites to consider. So more work to do to
figure out what the screen should look like and output it via HDMI but
I'd assume it's doable.

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