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zeitghost
19th November 2012, 12:43
Electronic Computer Exhibition (http://www.r-type.org/timeline/time-017.htm)

Stone me, OC44 and OC45 transistors in a computer. :eek:

I built an audio amp with OC23 transistors.

It sounded quite good.

Just noticed that there's mention of a vey early "Xeronic" printer.

The predecessor of the laser printer.

The result of co-operation between Rank & Xerox.

SupremeSpod
19th November 2012, 12:59
George3 running on Raspberry Pi (http://sw.ccs.bcs.org/CCs/g3/g3pi.htm)

:bang:

Gibbon
19th November 2012, 14:57
Ahhhh, Eliot processors, brings back some memories. Worked on the 920C with a half ferrite core and half EEPROMS. 14 octal machine instructions and that was your lot, searching link maps for spare bits of memory and having to do stepping stone jumps to get to a big enough piece of contiguous space. :smokin

xoggoth
19th November 2012, 18:29
Eliot processors? You must be a lot older than you look!! Think the Elliot 405 was the first I ever worked on.

mudskipper
19th November 2012, 19:43
George3 running on Raspberry Pi (http://sw.ccs.bcs.org/CCs/g3/g3pi.htm)

:bang:

George 3

That's where I started my life in IT.

Gibbon
20th November 2012, 09:17
Eliot processors? You must be a lot older than you look!! Think the Elliot 405 was the first I ever worked on.

It was some old military kit, designed in the 70s and still in use in the nineties.

zeitghost
20th November 2012, 10:01
It was some old military kit, designed in the 70s and still in use in the nineties.

Funny how that old core store is rad hard & comes back to life after you cycle the power.

Unlike dynamic ram.

:smokin

And speaking of which:

Glenn's Computer Museum (http://www.glennsmuseum.com/components/components.html)

Plated wire memory.

I'd forgotten about that one.

And here's one they've just repaired:

BBC News - Two-tonne Witch computer gets a reboot (http://www.bbc.co.uk/news/technology-20395212)

Described in today's Metro (that journal of record) as


This ramshackle collection of valves, buttons and wires

:eyes

It doesn't look particularly ramshackle to me.


The machine first ran in 1951 and was known as the Harwell Dekatron - so named for the valves it used as a memory store.

Although slow - the machine took up to 10 seconds to multiply two numbers - it proved very reliable and often cranked up 80 hours of running time in a week.

Ah, blinken lights - Dekatrons are neon filled counter valves.

10 seconds per multiply. :frown

Quicker than someone using a mechanical adding machine, I suppose.