i have long threads on the PowerBook linked here https://anticapitalist.party/@ahihi/116256057687007923 but in summary, it is a PowerBook 160 (25 MHz 68030, 8 MB RAM, 4-bit grayscale display). it runs System 7.5.3, which i really should downgrade to 7.1, but lazy i had to do a few repairs to make it usable - replaced power supply - replaced HDD with BlueSCSI - replaced display cable - recapped display - glued loose trackball roller to axle - replaced keyboard - replaced PRAM battery