Assembled

I assembled the new board just before going on holidays.

First test showed some activity but not the Busy Beaver:

Okay, I will sort this out when I come back from holidays.

Back from holidays

I checked the code and find an error.

Fixed the error still not working.

Realise I have a problem because I don't latch "Din" to the Flash ROM.

As soon as the mark state changes the next state will be wrong (I need to latch Din).

The A0-4 oscillates between 00000 and 00011 which results in Mark 1 and move Left (which is observed). This is state A and state B.

ADR0-4 cycle between 00000, 00010, 00001, 01001. Only the first and third next states are latched.

It appears to be working otherwise.

So if I latch Din with ADR0-4 it should work!

Updated Schematic

Updated the schematic to latch  Din at the beginning of each instruction pair:

I will double check it tomorrow before sending it off for manufacture.

AlanX