And thus, without any bugs (so far), the V.1 hardware of the Z80 SYSTEM B is complete.
Ain't that pretty? I have no idea what it's doing, though, it's clearly doing something, and at one point, it read data from port 0, and as you see, it displays something on ports as well. There is no system ROM, so I'm guessing it must be random data stored in the RAM... Anyway the hardware is behaving as expected, so all good so far. Now; for the ROM..
And as a side note: step 2 hardware includes qwerty keyboard and LCD from a early 80's electronic typewriter.