So here we are, two thirds of the way through the month and the Nascom-1 is looking just as it did when I started 🙂
This is the Nascom with a ROM in it that fills the screen with NULLs. I’ve just pressed reset.
Now look at this photo…
Their behaviour with these ROMs after reset is pretty consistant but not guaranteed.
But what does it mean?
I don’t know, but I’m sure it means something. It could mean I’ve mucked up the ROMs. As 2708s are hard to find and program, I’m using a 2716 in a little adapter that I made myself but they look fine.
With the alternative ROMs in place, we’re only using the screen RAM and the addressing logic, buffers etc.