No Honeywell love? Started with CP-6 machines, some IBM S/34 hardware support, Sequent Balance and Symmetry machines, SGI back in the heydays, and now IBM and Cray HPC systems.
Sequent, SGI (Challenge platform) and IBM BlueGene stand out as my favorites.
See my post?
I was a service engineer for a US Army logistics system (also finance/accounting systems) with Honeywell at it's core. It was a mishmash of gear. Called it DAS3
Honeywell Level6 Mod 47
CDC 40MB removable pack 14" 5 platter drives (8)
STK vacuum reel-reel 9-track tape drives
Decision Data card punch/reader
Tons of comms, BSC, SDLC, Async modems, etc.
All mounted in a 48' semi van painted green with HVAC slapped on the front.
I learned S/36 while stationed there, had one in garrison as a front end for the DAS3. When I got out, got a job doing S/34, S/36, then AS/400 engineering services (repair, installs, mods).
Still doing IBM i on Power (aka AS/400) to this day plus all things that go with it. It's like the mainframe they said would die but still going since 1988 (mainframe [now Z] has been around 50+ years). More of an SE role doing implementations, migrations, upgrades. Storage, probably 50% of my work now is implementing storage arrays and doing migrations. Minority Partner is a small business doing mom and pop stuff for years until we sold. Then worked strictly fortune 50-500 for a while but now with a merger back to everything from small shops (regional banks, etc.) to fortune 50.
I've done WIntel stuff, blade chassis, switch/route, circuits, security/firewall gear, you name it. Every time work gets a little slow someone tells me I'm a dinosaur and need to reinvent myself, then more work comes rolling in.