"Rik Bos" <hp-fix at xs4all.nl> wrote: there I have one of these as well. Mine is in excellent condition. I did use it to debug an HP 59309A Digital Clock and it was quite useful (although without the service manual for the 59309A I wouldn't have gone far). I also used the HP 59401A to help me understand the Amigo protocol for a floppy emulator. So its useful, but its slow and cumbersome (its fun entering HP-IB commands using the switches on the front when playing around, but for recurrent and complex tasks you'd rather use a computer). You can't even leave it connected to the HP-IB bus all the time, because it slows it down and causes some devices to complain. Nevertheless its a great addition to any "blinkenlights" display. **vp www.series80.org