CSIRAC was the fifth 'First Generation' Computer ever built...and is significant in that it is the only one still in existence anywhere in the world.
http://www.cs.mu.oz.au/csirac/
A 'first generation' computer is one which utilizes Vacuum tubes...they were pre-solid state [transistors].
This one ran at 0.001 Mhz which makes it about three billion times slower than a modern desktop....the RAM was approx 1.2k.....but it all had to start somewhere....
Check out the link for a bit of a history lesson...
When I saw CSIRAC at the Melbourne Museum last year there was a young kid beside me who muttered 'where's the monitor?'.....[he was about 7 years old]....
On the site there's some quicktime audio...dating back to '51....and an Emulator [though I haven't worked out what it's actually 'doing']....
