So I'm working on a 130XE for someone, for way too long now actually, and I have installed a rapidus and a U1MB into the machine. It took some additional troubleshooting to make it work, but the last problem I can't seem to get rid of is that some cartridges don't load.
Basically, rapidus freezes while loading the FPGA core. The loading bar never fills.
I've got it narrowed down to 16K cartridges, and I've actually narrowed down that it has nothing to do with the cartridge itself, but that RD4 is pulled high (and thus RAM at $8000 disabled). Has anyone with rapidus been able to consistently get 16K cartridges to load? This machine has no issue with 8K carts at all, just 16K. The worst part, is that I SWEAR I had 16K carts working 2 times exactly (no more, no less) but it wasn't because I fixed anything, or did anything, it was just random chance, apparently.
I've removed the U1MB and gone back to the normal MMU and OS ROM, no change. I even reflashed the CPLD and loaded the latest FPGA core, also no change. I've tried different CPUs, no change.
I've found other mention of issues with carts, but just from one person: http://atariage.com/...ions/?p=3597056
he says DK didn't work, that's one of the ones I tried here, and it's a 16K cart. Earlier, he said defender didn't work, another 16K cart.
Also, inserting a cart when the system is on (after the rapidus core has loaded) and resetting lets the carts load fine. So it's something specifically during the FPGA core load. I don't know, maybe the rapidus designers forgot that there might not be RAM at $8000? sounds doubtful, but not impossible.
Edited by Joey Z, Mon Apr 3, 2017 11:44 PM.