An Amiga 1000. With a broken monitor.

Hmm...necro thread. Sure I still have my old C64 and a nice selection of old rpg games and a few lucasarts and infocom ones too. I have no idea if it still works or even the monitor. Will have to clean and pick up around someday to find out ^_^

Vectrex 1982-1983.

I only keep laptops, oldest one is a Win98 PII 233 with 128 MB RAM. In DOS mode, this system can run the original XCOM and many other DOS games like Lands of Lore etc without any slow down tools or patches.
If I need anything older, I just walk to my friend's house who still has an operational Atari 2600, C 64, Amiga 500, Amiga 2000, Intel 486 and a whole assortment of joysticks etc for all systems. It's like a little museum.

Acorn Electron, with a few games (Arcadians, Hopper, Boxer, Boffin, Frenzy and a few others IIRC). Used tape cassettes back then. It may still even work, was a lot of fun.

A Texas Instruments TRS-80, with a whopping 16K of RAM to do it all in.

The funny thing is, that I remember writing an overtime analysis program that was used by a Fortune 100 company for a few years, that was quicker, cleaner, and cheaper than probably anything I have done since :-)

An Apple II from 1977, complete with floppy drives is gathering dust in the attic.

The computer that started it all for me, was the Commodore64.

An Intel 80386 at 20MHz in an IBM PS2. Didn't have enough money to buy the 33MHz edition......

It is funny, I built a 386DX40 that I still have. The chip was an AMD that I tried, because the bus was 7Mhz faster than the Intel. The good old days of jumpers all over the place on the motherboard.

Two Commodore 64 (one in original box!), dunno with one is the oldest. :)

A PlayStation.