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+--- Thread: HP-75 Designations? (/thread-16081.html)
HP-75 Designations? - toml_12953 - 12-28-2020 02:27 AM
I see ads for HP-75 C and D. Are there only those two? What are the differences? Which is the most powerful of the HP-75 line or isn't there a difference in that regard?
RE: HP-75 Designations? - Steve Simpkin - 12-28-2020 03:07 AM
(12-28-2020 02:27 AM)toml_12953 Wrote: I see ads for HP-75 C and D. Are there only those two? What are the differences? Which is the most powerful of the HP-75 line or isn't there a difference in that regard?
From the HP Museum page for the HP-75C/D.
"The HP-75D added a wand and wand port." The HP-75C was introduced in 1982. The HP-75D came out in 1984. I don't know if there were any other differences other than the price.
RE: HP-75 Designations? - Sylvain Cote - 12-28-2020 03:31 AM
The only difference between the HP-75C and the HP-75D is the wand port.
HP also introduced the Bar Code module and two wand version for the HP-75D.
Later on, HP introduced the POD who had some of the bar code module logic.
HP-75D inventory system often had: HP-75D in the POD with a wand.
Code:
Model Description Introduction USD Price : Year
75C Handheld Computer (16KB RAM, HP-IL, Card Reader) $995.00 : 1982
75D Handheld Computer (75C + Wand Port) $1095.00 : 1984
82700A 8KB RAM Module $195.00 : 1983
82725A Bar Code Module (75D only) $75.00 : 1984
92267A Hi-Resolution Wand (75D only) $160.00 : 1984
92267B Med-Resolution Wand (75D only) $150.00 : 1984
82718A opt. 032 Expansion Pod (300 Baud Modem + 32KB E.Disk) $875.00 : 1984
82718A opt. 064 Expansion Pod (300 Baud Modem + 64KB E.Disk) $1175.00 : 1984RE: HP-75 Designations? - J-F Garnier - 12-28-2020 08:18 AM
(12-28-2020 02:27 AM)toml_12953 Wrote: I see ads for HP-75 C and D. Are there only those two? What are the differences? Which is the most powerful of the HP-75 line or isn't there a difference in that regard?
More important than the 75C/D labelling is the ROM version.
The ROM version can be obtained with VER$ but is rarely mentioned in ads.
There are basically 4 versions: aaaaaa , bbbbbb , cccccc , dddddd.
although it existed some mixed versions like bababa.
The latest version dddddd is preferable.
Moreover, there is no simple correspondence between the 75C/D variants and the ROM versions, there are examples of 75D with ROM aaaaaa or bbbbbb although you have better chance to find the dddddd ROM in a 75D.
J-F