"ZN"
<zeljko.nastasic@ To: [EMAIL PROTECTED]
zg.tel.hr> cc:
Sent by: Subject: RE: Re: [ql-users] Clive
Sinclair
owner-ql-users@nv
g.ntnu.no
19/10/2001 17:07
Please respond to
ql-users
>> Wafer memory...
> "Wafer Scale Integration" I believe he referred to it as at the time.
> An ambitious project back then (maybe even today) because it requires
> flawless wafer sized pieces of silicon. Even though silicon is the
> earth's most abundant (or second or whatever) element, the cost of
> fabrication of silicon integrated circuits is related to the yield of
> working chips from each wafer. Even some of those that fail to make the
> grade can sometimes pass at lower clock rates and can be marked and
> sold as lower spec. With wafer scale, it's all or nothing. The
> rejection rate must be huge, and that is probably what ate most of his
> investment in plant - the production of flawless silicon wafers.
> Bzzzz. Wrong. It refers to a bigger microdrive like device,
> with magnetic tape. The same infinite tape trick as in microdrive, no
> rewind needed. It was the alternative to floppy. (or the evolution of
> classical tape).
ZN wrote:-
>Bzzz - you are both wrong!
>First, it was not a tape. Do not confuse WM with something that was a
tape,
>
>loop tapes similar to microdrives just much larger (they looked
>
>know, they never made it to the QL, and that's a good thing too.
Bzzz.. Spot on, Nasta.
I still have a wafadrive with my Spectrum and several dozen tapes. They
were made by Rotronics, and I bought mine new. Still have the original
packaging and the lot. They are a little smaller than a standard audio
tape, in fact they were often sold in blank audio cassette boxes instead of
a custom made container for them. I even have some commercial software I
bought on wafadrive!!
Cheers,
Darren.
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