Technical problem-disassembled instrument to clean keyboard-disconnected ribbon cables, carefully put everything back-now ramdisk (512K) is locked up. Everything else works perfectly, and ramdisk had worked perfectly for the three years I've owned it. Is there a way to initialize the ramdisk? I know how to bypass, holding down enter and powering up, but trying to access the ramdisk locks up everything. I noticed a small battery or capacitor on the board-measures 4.25V with S3T powered down. Could this be gone? Keyboard dates on the chips are 1995 I seem to recall. If anyone can help, thanks!