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26-03-2002, 02:53 PM
I would like you to help me find a list of computer trends in computer systems that have occurred over the last 20 years (eg in terms of cost, speed etc

26-03-2002, 04:14 PM
The following may be relevant:

Www.storage.ibm.com/hardsofft/diskdrdl/gmr/fig1.gif

http://www.nature.com/server-java/Propub/nature/399729A0.figure-2H

http://news.bbc.co.uk/hi/english/sci/tech/newsid_1065000/1065760.stm

I did a study a few years ago that showed the average over last 40 years was:


$ for box of fixed RAM size dropped by 20.6% per annum

Typical speeds , disk capacity, Ram capacity per box rise by about 58% p.a.

1991 1999
Average disk-drive capacity 0.145GB 7.7 GB (53x)
Average disk-drive cost/GB $5,230/GB $18.42/GB (284x)
Disk drive Cost $758 $142

How?
Every 3 to 5 years there is a major new breakthrough. eg.
Valves to Transistors
Germanium to Silicon
to Integrated circuits
to Large Scale Integration
CISC to RISC
TTL to ECL
Paper Tape to Magtape
Ethernet
IP
Symmetrical Multi Processing (SMP)
? and in between there is gradual improvement.. eg.
800 bpi tape to 6250 bpi tape
8086 CPU with 4Mhz clock to Pentium 4 CPU with 1500 Mhz
8in floppies to 3.25in
10Mb Ethernet to 1Gb
etc

26-03-2002, 08:27 PM
Let me guess, an assignment?

I did have a plot of PC prices for about six years, but think it has gone now.

Prices kept dropping until the cheapest PC got to around $2000 then they stopped getting cheaper and they sold bigger ones. Hardly any sell for less than $2000, and they like to accessorise them to $3000 if they can.

In terms of broad items, 20 years ago:
1MHz processor
48-64Kb Ram
No HD (but 5Mb ones came soon after)
Floppies with 143Kb capacity.
64colour display, most were mono. 14' was big. Many used home TV.
Block graphics, sprites, maybe about 160 x 240 pixels if you were lucky.
Crappy mono one-bit sound.
No mouse, 300 baud modem, 1200 if you were rich.
No laser printer or inkjet. Dotmatrix or daisywheel were all there was.
No scanners. No CD. No DVD.

Compare to now and work out what the changes happened.

robo.

26-03-2002, 10:50 PM
go to www.census.gov/population/www/socdemo/computer.html

not really info on speed or any thing but some good info on computer usage and internet usage.

Let me take a wild guess and say that you need this for 6th form certificate in computer studies. ive just about finished my assignment.