On Tue, 10 Jan 2006 at 20:11:38, Paul Holmgren wrote:
(ref: <[EMAIL PROTECTED]>)
>Tony Firshman wrote:
>
>>On Tue, 10 Jan 2006 at 13:22:56, David Tubbs wrote:
>>(ref: <[EMAIL PROTECTED]>)
>>
>>
>>
>>>>And this 'Noise' problem was the reason for the popularity in the
>>>>USA of the "Bent" modifications to the QL's.
<snip>
>one of the 'mods' was the jumpering of the 5V line with 24 or 22 gauge
>wire.
>the Idea I recall was to reduce the foil trace resistance and the tie-in
>points were also effectively
>shortening the total path the 5V took to get to the farther point it
>anchored to
>( this is off the top of the brains long term memory that is not burned
>out yet )
>seems I recall it took a path that was over 12" to a path that was maybe
>only 7"-8"
>and because the capacity of the wire exceeded the trace it was deemed
>beneficial.
That was also done by Sinclair on later boards - from 5V to the RAM
area.
It was a pity that multi-layer board were not available then.
Gold Card, superGoldCard, Aurora (and Mplane) have inner layers for
power and ground (mainly).
Tony
>
--
QBBS (QL fido BBS 2:252/67) +44(0)1442-828255
tony@<surname>.co.uk http://firshman.co.uk
Voice: +44(0)1442-828254 Fax: +44(0)1442-828255 Skype: tonyfirshman
TF Services, 29 Longfield Road, TRING, Herts, HP23 4DG
_______________________________________________
QL-Users Mailing List
http://www.q-v-d.demon.co.uk/smsqe.htm
