1977 saw my first videogaming experience. Atari Ultra Pong! It came with two paddle controllers. You could play with 1, 2, or 3 in-game paddles; play pong or hockey (smaller goal that the ball could bounce behind); and play with or without little lines on the side that the ball could bounce around between. 16 games in all!
There's a picture of the system about one-third of the way down the following page:
http://www.pong-story.com/atpong2.htm

Hey, it's Chippy!

Home Pong. 1975 or 1976 (can't recall the exact year). I was 11 or 12.

I think it was a Q-Bert variant on a console which only had that game.
After that it was 1 of the Atari consoles at friends. No idea of the names of the games, but we played quite a few. I remember playing a game shooting pidgeons with a gun that was attached to the console.
Around 1986 we had a 8088 pc. First game on that was a pacman variant, shortly after followed by Pango, Digger and Alley Cat.

Some ancient firetruck game thingy and a platformer called Word Rescue. It didn't take many months before I knew how to operate DOS, and started playing DooM.
EDIT/Continuation:
Don't know the specs of that computer, as I was only 5 years old at that time. However I remember that it couldn't play DooM on full graphics. We got a bunch more computers, though only a few was used for games, though I still don't know any specs of those either. We had a lot, since my father is an electronics engineer, so had a lot of testing equipment, CAD, programming stuff and all that crap.
My first very own computer I can only remember the hard drive that had a 450mb hard drive and 25mb RAM, but there were some error that I can't remember that resulted in that I only had about 16mb. When my mother got a laptop through work I used it most of the time, until I managed to spill something on it, rendering it useless. We sent it in for repairs, which took 4 freaking years, which resulted in getting a brand new one, with 3/4 AV's installed for some reason. That was a pain to clean up...
Then there was my hunk of junk with 64Mb RAM, 450mhz processor, 27gb hard drive and a Trio3D with 2Mb RAM. My next one had a 1.6ghz processor, 512Mb RAM, GeForce MX440 (later upgraded to FX5500), with the old 27gb Quantum Fireball. Not long after I got my first external hard drive on 200gb, which bit the dust, but I plucked out the drive that actually still worked, and is actually my OS drive today.
Then I got a few more external drives, upgraded to a 2.(something) processor, 2 GB RAM, and a ATI Radeon RX1950 512MB. Somewhere around this time I got a XBox, a bit later I got a NES, and some time after that I got my DS. Since then I've swapped my RX1950 (which fried) for a HD4870 512Mb and a 3.02 Ghz processor.
Can't remember much about individual games, since I've played a few hundred of them, but when I grew up I almost exclusively computer games, since I didn't have a console. Of course, that didn't fit in much with all the people with a N64 and Playstation, playing games like Tekken, *Some game I can't remember on PSX which was wildly populer*, Zelda and Mario64.
I mostly played DooM, Duke Nukem 3D, Descent, Warcraft 2, Command & Conquer, Dune 2, Scorched Earth and a crapload of other games when I think about it.

simcity 2000 baby! i played it on my dad's "portable" laptop that weighed 10 pounds at thirteen inches. that thing was state of the art too.
then it was diablo and age of empires. good lord, i could only play those games at a friends house at first, but I used to fall asleep dreaming about them. seriously. god damn i love pc games.
mmmm... pc games in a thong with some chocolate syrup
i have a BONER

My first games were text adventures, and later I had things like Fooblitzky, Alley Cat, and King's Quest.

Hey, that was one of my first games too...
My first gaming memories are of that and a C64 cartridge called "Kindercomp", which taught me how to do a few useful things... like spell :)

...this.

I am so old.
My first game was on an arcade machine, Asteroids or Space Invaders .
2nd platform/game was Pong on coleco.
Third was atari 2600, cant remember the 1st game though.
4th was NES, Mario.
5th was PC (286? 386?), River Raid.
6th PSP. Wipe Out.

My first gaming experience was Wolfenstein 3D when I was seven on my granddad's computer. My parents weren't very happy to find out I was running around in a castle with Nazi symbols all over the place, gunning down enemies. Bafflingly, when I got home, they bought me a Nintendo 64 and Goldeneye, but quickly took Goldeneye away because for whatever reason they didn't expect you to go around shooting people in a game about James Bond. It was quickly replaced with Mario 64 (maybe that's why I love that game so much) and Goldeneye got stuck in some boxes. When I was old enough to play it, they couldn't find it, and when we moved twice, we were pretty sure it was gone forever. However, two years ago, a week after I turned 16, they finally found it in a box! By then, I was playing more advanced games like Half-Life 2 and The Darkness, but it was awesome to play it again after eight years all the same.

my first gaming experience was on Pegazus.
It was Russian NES ripoff. Very awesome. I remember some tennis game, duck hunt, contra and few others.
I also played a lot on my sis amiga 500. Settlers 1, Kick off and maybe few others.
My first pc (my parents to be exact) was 486DX2 4MB of Ram, 500MB HDD, 14inch COLOR monitor. Command and conquer run perfectly as well as transport tycoon (ah. good times), Megarace 1, theme park

My first gaming experience was with Duke Nukem 3D. Ah, memories. :D