Having said that, I sometimes still privately make some little demos and such for fun. I've attached a few here: tykel-chip16.zip.
I have also mulled adding a 1.4 or maybe a 2.0 spec version, with the following additions:
add a new SNC x instruction (set current audio channel to x, 0..2). This would allow multi-channel audio at last.
specify that I/O port 0xFF4-5 would be updated with the latest pressed keyboard scancode after every VBLANK event.
clarify the representation of values in registers and memory. I.e. depending on context, they are interpreted as either 16-bit two's complement signed integers (e.g. for math operations), or 16-bit unsigned integers (e.g. for addresses).