HP 9101A Memory Unit



#2

I recently came across a 9101A memory expansion unit for the HP 9100 calculators. I hooked it up to one of my HP 9100B machines, and found that it mostly works but there are some memory locations that always report that they are protected and no amount of fiddling with the settings change this behavior. I have cleaned all of the circuit board connectors and reseated boards with no improvement. I haven't been able to find any service info on this device. Does anyone here have insights into how to go about diagnosis and repair?


Possibly Related Threads...
Thread Author Replies Views Last Post
  Unit circle on HP Prime Mic 2 532 08-28-2013, 05:22 PM
Last Post: Thomas Klemm
  Unit conversions inside programs on 50g Chris Smith 2 571 02-23-2013, 05:35 AM
Last Post: Chris Smith
  41 User Memory vs System Memory Gerry Schultz 6 957 07-01-2012, 12:02 AM
Last Post: Monte Dalrymple
  17bii unit conversions Dave Britten 12 1,416 03-27-2012, 11:59 AM
Last Post: Dave Britten
  Re: Voyager 1xC emulation in the same unit? uhmgawa 4 747 01-24-2012, 01:09 AM
Last Post: uhmgawa
  Wp34s unit conversions Cristian Arezzini 4 660 07-25-2011, 05:02 AM
Last Post: Paul Dale
  SpeedUI Bug with Unit Conversion? Timo 1 398 06-20-2011, 06:13 PM
Last Post: Raymond Del Tondo
  Preprogrammed EPROMs for HHE PE unit for the HP41CX Prabhu Bhooplapur 3 541 01-28-2011, 02:08 AM
Last Post: Geir Isene
  Unit conversion on the 50G Jim Creybohm 2 474 08-19-2010, 05:30 AM
Last Post: Vieira, Luiz C. (Brazil)
  Unit conversion Module Reloaded Ángel Martin 2 505 05-03-2010, 07:13 AM
Last Post: Paul Dale

Forum Jump: