Jesus that last picture. I absolutely love and hate it! I have the luggable version of the XT, but sadly no disks for it. I do have a semi-cursed idea to bootstrap it using a modern PC, the serial port, and a machine code program poked in via the ROM BASIC, but its been backlogged for a while.
Something else neat, the manual for these have the BIOS source listed.
ADTPro[1] is a package for Apple II class machines that will bootstrap a diskless machine over cassette tape interface or serial port. If you have a disk but no usable media, it will let you image a boot disk.
Something else neat, the manual for these have the BIOS source listed.