You can see it’s working fine. https://youtu.be/nFUlOjuZ1Og
The working model has not “Lambda 8300” labeled on it’s cover. The PCB however is a little different with the label “PC8300”.
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube
My own one Is labeled „Your Computer“ on the Box.
https://k1.spdns.de/Vintage/Sinclair/80 ... ng%20Kong/
P.S.: ZX-Team member Sascha2000 has developed a „Multirom“ PCB for the lambda (clones), see
http://forum.tlienhard.com/phpBB3/viewt ... t=Multirom
ZX-Team member and classic computer collector