I thought the DeskWriter 3.1 was the first HP inkjet designed for the Mac, as it came out in 1989, and not the 540c. My mom had one with her SE (which was transferred to me in 2004) for nearly 10 years, and by far it was one of the best HP inkjets ever produced. The quality was outstanding, and the ink cartridges were fairly inexpensive (although we refilled ours). Unfortunately, the paper feeder malfunctioned, and was tossed out in 2004.

In regards to the LQ, I thought it had 27 pins, not 24 (hence the reason for the spacing problems). Either way, it would be nice to find one.