So the very first A500 I had been testing on since the beginning of the project had a Bug Katcher installed. It turns out that I wasn’t really using it, but I left it plugged in anyways. I’m not sure...
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Logic Analyzer probe loading seems to fix boot issue
While I had my logic analyzer connected to my memory card tonight, I noticed that I no longer had the white screen hang on bootup problem that I’ve been plagued with since this card came in. As a matter of fact...
Workbench booted up with the new card installed!
For those of you who might not get the significance, workbench loads a number of libraries into the extended fast memory on bootup. As you can see in this image below, more fast memory is actually being used than the...
Found potential race condition on writes
After looking at datasheets for the 273 latches used and 74act74 flipflop used, the worst case propagation delay is something like 12.3ns. But my NAND gate ACT00 logic which is triggered by the same CAS signals has a...
PCBs have arrived!
Just in time for Christmas, the PCBs have arrived from China. I used Seeed Studio (Fusion PCB Service) and they look pretty good. Here’s the first look at them. I’m just about to solder one up, so wish me...
Found problems with incorrect footprints used for some chips
So I received all of the SMT parts today, and attempted to verify that I’ve used the right footprints for the parts. This was a worthwhile effort because I found a few different problems. Also, digi-key shipped me...
