Early HP-80 number keys and front label


I recently acquired an early HP-80 that has a raised nipple on the 5-key. The legends on the lower four rows of keys are also less bold than those on later models. The front HP label does not contain the '80' designation.

Does anyone know when the raised nipple and less-bold keys were discontinued? Also, when was the '80' designation added to the front label?

Thx for any info or leads.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Broken keys on HP Prime? Tarcisi C 0 565 12-10-2013, 05:59 PM
Last Post: Tarcisi C
  HP 50g switching two keys in the user keyboard Sean Freeman 9 1,702 12-05-2013, 11:44 AM
Last Post: Mark Puscas
  HP-80 History, Design and Interesting Facts BShoring 1 543 11-30-2013, 08:50 AM
Last Post: Xavier A. (Brazil)
  A fast Bernoulli Number method for the HP Prime Namir 16 2,174 11-22-2013, 04:46 PM
Last Post: Namir
  Layout of arithmetic keys on early calculators Walter B 10 1,429 11-20-2013, 11:13 AM
Last Post: Jake Schwartz
  [HP Prime] Calculating Prandtl Number with Units (bug found in USIMPLIFY) Timothy Roche 1 570 11-13-2013, 04:07 PM
Last Post: cyrille de Brébisson
  HP Prime: Converting number to Sci notation and back BruceTTT 1 565 11-12-2013, 02:11 AM
Last Post: Phil Wipf
  HP PRIME: Fixed 4 number format 0.001000 Joseph Ec 18 2,331 11-07-2013, 11:51 AM
Last Post: Geoff Quickfall
  HP Prime: Number of external Variables Davi Ribeiro de Oliveira 0 435 11-01-2013, 08:10 PM
Last Post: Davi Ribeiro de Oliveira
  HP-80 Teardown with pictures Max Stone 10 1,607 10-24-2013, 09:10 PM
Last Post: Walter B

Forum Jump: