Astra-generated boot disc reportedly ran on a 1977 Terak 8510 on the first try

A user says Astra generated a boot disc image with a custom PDP-11 graphics demo for a 1977 Terak 8510. He wrote the IMD file to an eight-inch floppy using a Greaseweazle and drives from his IMSAI. He says the disc booted and ran on the first try, with an executable binary and boot loader.