Whats the first Operating System you ever used? - l0ckergn0me

BBC Acorn's BASIC/OS. - Kol Tregaskes

Microsoft Basic 2.0 on the Commodore 64 - Victor Ganata

The PDP-11 - MVS? Then Color Computer Basic, then OS9., then DOS, then SysV 3.2 and so on... - Soulhuntre from twhirl

I was using a C-64 in elementary school.. then U of Delaware's Plato room, Apple II, then the original IBM PC. - Phil G

PLATO, but it was more of a dumb terminal which had Cyber1 or NOS 2.8.7 as an OS. First home system was TRS-80 Basic - Andrew Leyden

Comadore 64 - CW™

Andrew - I totally forgot I did play on a CoCo and Trash-80 back in the day, but they were both after the C-64 - Phil G

BBC Acorn's OS, same as Kol - Timothy Griffin

Commodore Vic-20 - Mike Reynolds

Commodore 64. Well, that was the first computer I ever owned. I might've been exposed to an Apple ][e first, though. - Akiva Moskovitz

C-64 - John Blanton

Atari basic. - Steve Isaacs

BASIC on an Apple IIe. - Steven Perez

CPM (on a Kay-Pro II) - Khyle

DOS 6, i think - Brett Kelly

Locomotive Basic + CPM (Amstrad CPC-464) - Thierry R. Andriamirado

Commodore 64. God, I'm old. - Bonnie Dean

BASIC on ABC 80 - Jemm

MS-DOS 2.11 - Morton Fox

Apple DOS on my ][ + - Bastard Operator From FF

The Operating System (TOS). Came with my Atari PC. - Guillermo Esteves

Apple DOS on a IIC ... whatever TRS-80s had ... MS-DOS 3? on a Tandy 1000TX was the first OS I did half-serious work in ... - Andrew Badera

Color Basic for the TRS-80 Color Computer 2 - Eric @ CS Techcast

OS/360 - Brian Sullivan

whatever the apple IIgs used - RAPatton

IBM PC-DOS 1.0 (if you don't include TRS-80 basic :) - Charlie Anzman

IBM BASIC on IBM-PC http://en.wikipedia.org/wiki... - Picolo

also pdp-8 and pdp-11 ... i dont remember the os - Picolo

Whatever Apple IIe had. (What did it have?) Also, I had a Commodore 64 at the same time, so whatever that had. - Rochelle

cpm on a Kaypro - Michael Markman

Mac OS 7.5.2 - videopixil

Trash-80 BASIC. - Cyndy

PDP 8 and /or 11, CPM (anyone remember using dBase and those huge 8-1/2" floppy disks?), Apple ][e. - Carlos Granier-Phelps

I forgot what computer was used in elementary school. It might have been a TRS-80 or a Commodore PET - Rodfather

My first OS was Windows 3.0 on an IBM PS/1 computer. Windows has come a long way since then... - pcnerd37

apple ][+, then CP/M - deeje from twhirl

I think it was either what the TRS-80 had or what Apple ][ had, not sure which I used first or when. - Grant Bierman

Sinclair Spectrum BASIC - Richard Peat

Commodore Vic-20 - Peter

BASIC on an Amstrad 6128 - Duncan Riley

BBC Acorn's BASIC/OS - paniaguai

Sinclair ZX80 Spectrum Basic - Sally Church

Apple ][ (at Hyde Jr. High in Cupertino back in 1977 -- that school's first computer club). I still remember the unboxing of that and loading the first program off of a cassette tape. - Robert Scoble

Using BESM-3M http://en.wikipedia.org/wiki... - Igor Poltavskiy

CP/M on my Mom's Kaypro - Laura Norvig

CP/M on a Northstar Horizon - Chuck Lawson