Rob1974

Thanks for the quick reply. I don't have a memory expansion yet so that would explain it! Is it safe to assume that my cartridge is working properly then? Thanks again, Rob

Thanks for the quick reply. I don't have a memory expansion yet - so is this the expected behaviour without the expansion? As I said, I'm new to all this!

I wonder if someone can help me? I was given a TI99 for Christmas and bought an UberGROM cartridge and a 512K cartridge. To test the UberGROM, I've burnt the SXB images from this thread to the 49F040 and ATMega1284P and that seems to have gone okay - reading back the images appears to confirm this. The cartridge gives the menu but only the following options seem to work: 'C - Disk Manager 2' 'O - Corcomp Diagnostics' 'P - Navarrone Disk Fixer' All of the other options either give a blue screen or fill the screen with random stuff. (Although it's random, it's consistent so I get the same random stuff every time.) I think the 74LS378 is starting up in a random bank as that's how it behaves in the 512K board - would this cause the behaviour I'm seeing? As I said, I'm new to all this stuff so please excuse my ignorance! Many thanks, Rob