SMT parts will be ordered soon. Once they arrive, I’ll double-check the pad design/placement is good, and then order the PCBs!
Everything is coming along swimmingly and I should have a prototype PCB in a few weeks.
So I’ve got a reasonable number of memory tests passing with the prototype solderless breadboard.
There are some minor issues that are mostly related to the stability:
So I’m starting to make some progress here, but I still have some troubles with my expansion board prototype.
For the first time, the initial exec-rom-based check passed, and the memory auto-configured. This happens occasionally on powerup.
Also, memtest is running a quick memory check and passing it with zero errors, but I really think it’s because it’s not doing a comprehensive test.
Troubleshooting is ongoing……….
With help from Ralf on this comment I was able to
Found a bad flip/flip replaced it, and now I’m on my way.
The amiga appears to be getting past the initial boot stages including the ram memory checks! I see the blue screen, and the disk drives starts loading workbench but crashes soon.
If anyone can tell me the exact meaning of this guru, that would really help me.
I’m pretty sure this means address error at that address, but that isn’t horribly helpful. I mean, does this mean a write failed, a read failed, something associated with that address, what?
This version is much better, much cleaner.
I also ordered some new wires that I hope will clean up the latch <—–>memory connections and amiga connector (CNX) to the protoboard.
Things are coming along……..
So I finished cabling up the solderless breadboard, and after checking connections, and checking pwr and gnd, I plugged it into the amiga. The amiga boots, which is a good sign, but then it never recognizes the memory. I’m not … Continue reading
Now I remember why I like FPGAs so much, no freakin’ wiring!@!#
Here’s a start to what the monster looks like. I think I’ll like the PCB form factor a little better. 
I thought a little bit about how I lay this out, but I didn’t come to any great solution. Almost seems like the traveling salesman problem!
