HP85 bus signal levels



#2

I assumed that the HP-85 (and other Series 80 machines) have 0 to +6V levels, but looking at the service manual on the
MoHPC CDROM, I see that the clock signals are 0 to +12V.

Can someone post here the levels that are expected on the
various pins of the I/O bus?

Thanks

**vp


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP85 tape reader; end of tape detection inaki 9 1,183 04-25-2013, 02:25 PM
Last Post: Paul Berger (Canada)
  HP85 Programmable ROM cardtridge 82929A-service ROM not working- inaki 2 607 04-25-2013, 08:08 AM
Last Post: inaki
  HP85 Waveform Analysis inaki 1 401 04-23-2013, 01:20 PM
Last Post: Paul Berger (Canada)
  Authentic HP85 color? inaki 3 499 03-11-2013, 10:27 PM
Last Post: Calum Tait
  Hp85 PRM-85 board Roe Peterson 2 462 12-08-2012, 12:00 PM
Last Post: Roe Peterson
  Putting n stack levels into a string Bart (UK) 0 241 03-14-2011, 10:55 AM
Last Post: Bart (UK)
  Some news (HP85 now A and B) Olivier De Smet 3 516 05-28-2010, 06:39 AM
Last Post: Johnny Bjoern Rasmussen
  HP71B - Bus Raymund Heuvel 8 767 05-07-2010, 10:49 AM
Last Post: Didier Lachieze
  Desktop calcs - residual noise levels? Mark Edmonds 11 892 10-30-2008, 05:27 AM
Last Post: Tony Duell
  How to list an HP85 ? Adrian Godwin 3 504 02-12-2008, 06:35 PM
Last Post: Adrian Godwin

Forum Jump: