* Posts by sdc

3 posts • joined 10 Mar 2011

Chap rebuilds BBC Micro in JavaScript

sdc
Happy

Re: "zippy performance, something the original BBC Micro was not famous for"

wasn't the first version of BBC BASIC written by one savant programmer, who just entered the code in and there was ~ 2bugs before it ran nicely? Or a I confusing by savants?

Spooks' secret TEMPEST-busting tech reinvented by US student

sdc
FAIL

re: 24MHz carrier ultrasound

no no no!

how does ADSL deliver 10's of Mbit/s over channels with ~100kHz bandwidth? not with OOK, but 256QAM or similar, giving many bits per Hz.

sdc
Boffin

on the nyquist comment...

12Mbit/s does not mandate a channel bandwidth of 12MHz. I would guess that the signalling rate is much lower but uses complex modulation formats to achieve many bits/Hz, much like the ADSL (broadband) comms most of us use everyday. These can achieve 10-20Mbit/s in a few hundred kHz of channel bandwidth. Note I said can ;)

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