Reading the video RAM directly to generate an HDMI signal gives you about the same image an emulator does. Loses a bit of the 'fuzzy retro' appeal imo ;)
The same approach is also used by the 'ZX HD' expansion for the ZX Spectrum which uses a Raspberry Pi for HDMI output instead of an FPGA and doesn't require soldering since the Spectrum has an expansion connector which can be used to read the video RAM.
Reading the video RAM directly to generate an HDMI signal gives you about the same image an emulator does. Loses a bit of the 'fuzzy retro' appeal imo ;)
The same approach is also used by the 'ZX HD' expansion for the ZX Spectrum which uses a Raspberry Pi for HDMI output instead of an FPGA and doesn't require soldering since the Spectrum has an expansion connector which can be used to read the video RAM.