Background
The HP EliteBook 800 is the initial model for the Elitebook 800 series, developed in October, 2013. This model released with three different screen sizes starting the 820/840/850 models. These models are in order from screen size of 12.5"/14"/15.6".
Identification
The HP EliteBook 800 is not a specific laptop but rather the shorthand term for the 800 series including the 820/830/835/840/850 series. These specific series are then broken down by generation level.
Specifications
There are three different original models for the 2013 HP EliteBook 800 which will be linked below to the corresponding iFixit Page.
HP EliteBook 820 G1 (12.5" Screen)
HP EliteBook 840 G1 (14" Screen)
HP EliteBook 850 G1 (15.6" Screen)
The following links will be for each series page which includes the more recent 830 and 835 series EliteBook.
Each series has different hardware specifications, therefore making it vital to find the specific page for your device as linked above.
Attached Documents
The attached documents below are the HP Support "Start" PDF's located on the support page for the Generation 1 Elitebook 800.