HP-80 lockup trick



#2

While punching around on an HP80 the other day, I found a way to lock it up with a blank display.

Turn it on.
Press DATE.
Press DATE.
Press X-bar.
Nighty night.

Later machines that display 9.99999999E99 after the first DATE will not lock up.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-80 History, Design and Interesting Facts BShoring 1 420 11-30-2013, 08:50 AM
Last Post: Xavier A. (Brazil)
  HP-80 Teardown with pictures Max Stone 10 1,233 10-24-2013, 09:10 PM
Last Post: Walter B
  HP-80 CHS Exponent Curiosity Max Stone 4 711 10-22-2013, 02:39 PM
Last Post: Max Stone
  PRIME Lockup after pressing Enter key in Solver. Harold A Climer 13 1,319 10-14-2013, 12:05 PM
Last Post: Tim Wessman
  HP 80 emulator Olivier De Smet 4 618 09-02-2013, 09:39 AM
Last Post: Vincent Weber
  HP 35 ... 80 Olivier De Smet 6 917 08-29-2013, 07:25 AM
Last Post: Olivier De Smet
  HP-80 Financial Calculator (1973) BShoring 3 571 03-25-2013, 11:39 PM
Last Post: BShoring
  [41CL] Lockup Recovery Procedures Dan Grelinger 1 330 01-11-2013, 05:53 PM
Last Post: Monte Dalrymple
  Series 80 EPROM cards Paul Berger (Canada) 0 423 12-08-2012, 07:50 PM
Last Post: Paul Berger (Canada)
  Series 80 UCSD Pascal Juergen Keller 3 486 10-23-2012, 02:16 PM
Last Post: Olivier De Smet

Forum Jump: