I was trying to disable the PROMs (to give Timeshare BASIC its maximum RAM) when I found that even when 'disabled' the DBL was working. That is, running from 177400 octal did a disk boot even with the DBL PROM disabled. So I 'removed' the PROM entirely and tried again. Still the DBL was there! It seems that a power-off is needed to make it actually go away. In further testing, I tried a 'Restore Defaults' in the Admin menu to get everything back as it was when the Altair arrived. But in fact this doesn't restore the PROMs but does wipe the floppy drives.
Okay, so I'll reload the floppies from a PC. Unfortunately, this no longer works. I set the floppy load rate to 9600 baud (to make the terminal emulator I use) and tried an XMODEM transfer (128 byte blocks, CRC checksum) to reload the floppy, but for some reason this no longer works. I'd loaded floppies several times before this morning using these settings, so it looks like a 'Restore Defaults' has changed as subtle setting somewhere that I need to fix. Anyone know what it might be?
Regards
Gabriel Egan