I just received an Atari 800 & an Atari 800XL. They had been in storage for an untold length of time, and I am not excessively knowledgeable about the system to begin with. So, onwards...
1) The XL has a dark red screen instead of booting. Have already swapped out all the 74LS chips, just waiting on a BASIC ROM (wanted to upgrade away from Rev.B anyways,) the OS ROM, & the MMU to finish the chips the Field Service Manual says to replace for that issue. So, nothing more to say on this until that is finished.
2) It came with an Axlon 32K module, a Mosaic 32K module, an Atari 16K module, and the ROM module. After a bit of experimenting around, discovered that the Axlon module will only work in slot 2 (with the 16K module in slot 1,) and that it has to be sitting "just right." Bump the system & it goes out. Took the 16K out of it's case, and put the Axlon in that and it is a lot more stable. Nothing I can do seems to get the Mosaic to do anything. Research shows that it will either do nothing, regardless, or will page itself (like the Mosaic 64K.) Does anyone have the manual or such for the Mosaic 32K? Am I supposed to install an expansion on the MB as well?
3) I would sort of like to put the 800 through a thorough test to see if there is anything else I need to get/replace. But I cannot seem to find any "disk based" testing software. Everything I come across points me to the SALT cartridge. I really would prefer not to get that for a single use.
4) Finally, Does anyone know a way of tightening up a female card edge connector aside from removing & replacing it? Would sort of like to get these connectors as stable as possible.