Operating Systems:
All DOS versions.
All versions thru Windows 10

Computer Languages:
BASIC
Fortran
C
Pascal
COBOL
LISP

Computer Processors & Computers:
80XX & 80XX6 (OMG, I'm old)
Pentium, Itanium, Celeron, Athlon, Duron
IBM Systems
Dell Systems
PC Compatibles
Apple

Software (not limited to):
Autocad 2015 and below
Autocad 2015 MEP and below
Revit MEP 2015 and below
Microsoft Office 2013 and below
Corel Office Suite
Bluebeam PDF
Adobe Acrobat
Photoshop
Paint Shop Pro
HTML Editors
All Web Browsers
FTP Clients
Various Electrical Applications
Vast range of productive office applications

Hardware (not limited to):
HP large format printers and plotters
Canon large format printers and plotters
Video, sound, network cards & associated cabling
CD/DVD Drives,
Digitizers
Cat 5e/6 cabling
Modems
Routers & Switches
Can build a PC