Nice PB! Thanks for posting up the pics. Does the motherboard itself have any unusual markings or writing etc, or is the flash EEPROM chip the main difference? Noting the YYY moniker wasn't the Powerbook XXX a prototype PB 5300/Mustang?
Most PB 5x0 units I've come across have looked very worn, even though they probably weren't as thrashed out as you'd think. They looked amazing when new but the plastics on these tend to scratch, fade and discolour easily over time. The plastics also tend to snap easily with a minor drop. Still, a souped up PB540c is my idea of the ultimate retro Powerbook, in terms of design and power under the hood for its day.
JB
Most PB 5x0 units I've come across have looked very worn, even though they probably weren't as thrashed out as you'd think. They looked amazing when new but the plastics on these tend to scratch, fade and discolour easily over time. The plastics also tend to snap easily with a minor drop. Still, a souped up PB540c is my idea of the ultimate retro Powerbook, in terms of design and power under the hood for its day.
JB