Optional HDMI sound

HDMI Sound Release

Full emulation of ZX81 and ZX80 with 1kB to 56kB RAM
Sound, pseudo HiRes, WRX, UDG, CHAR$128, M1NOT
50Hz and 50.6Hz 576p; 60Hz 480p
No O/S, sub second boot time, full screen
HDMI and VGA
Sound over HDMI or audio socket
Configure for European or US emulated TV
Frame and interlace synchronisation
Optional ZX81 Big Bang ROM
Tested against large set of software (see Readme)
Joystick and ZX81 USB keyboard support
Pre-built uf2 for 4 commercial boards, plus custom board
Example configuration to copy to micro SD Card

Additions over previous release

Sound over HDMI or audio socket
Additional uf2 builds to support HDMI audio
Configurable menu margins to support TVs with large overscan
Improved keyboard debounce for menus controlled by ZX81 USB Keyboard
Bug fixes
Updated Readme