Close

Another Bad Board

A project log for 8 Bit TTA Interpreter

TTA (Transport Triggered Architecture) is very simple CPU type.

agpcooperagp.cooper 07/05/2018 at 09:100 Comments

Another Bad Board

I assembled the new Mother Board, hooked up the Nano and no, it did not work.

I had swapped RD and WR signals but still the Data LEDs did not light. Checked the code (worked as expected last time), the hookup and then the schematic. All good, the Nano reports that the Data switches work so it had to be the PCB. Yes, I must have forgotten to update PCB after the last schematic update. The LED Data WR signal is a mess. Its not just a simple jumper.

Oh well, I may as well check all the other boards and get all the corrected PCBs at one time.

Need to do some research on Forth internals as well.

The PC board has a fault as well. Using jumpers for everything means you have to check the jumper labels very carefully.

And more bad boards. Made corrections and sent off for remanufacture.

AlanX

Discussions