🚀 go-pugleaf

Mike Tomlinson <mike@jasper.org.uk> wrote in message
news:09BuL7D4B7F5EwhH@jasper.org.uk...

> In article <PU5YdDAqc3D5Ew1u@btinternet.com>, Tom Bird
> <hamster@nospam.demon.co.uk> writes
>
> >Can't you just solder a wire onto the socket or completely rip the
> >soldered CPU off the board?
>
> Tom, this is demon.tech.pc, not alt.comp.motherboard.psychopaths.

Cor, people who live in glass houses....

I present an archived newsgroup posting from this very newsgroup...

> From snews@child.demon.co.uk Sat Aug 31 22:40:12 BST 1996
> Path:
child.demon.co.uk!news.demon.co.uk!dispatch.news.demon.net!demon!jasper.
demon.co.uk!mike
> From: Mike Tomlinson <mike@jasper.demon.co.uk>
> Newsgroups: demon.tech.pc
> Subject: Re: CPU upgrade in Ambra
> Date: Sun, 25 Aug 1996 09:39:36 +0100
> Organization: The Pub
> Lines: 26
> Distribution: world
> Message-ID: <qvktbEAIFBIyEwGQ@jasper.demon.co.uk>
> References: <840552910snz@bitmap-brothers.co.uk>
 <383309716wnr@naismith.demon.co.uk>
> NNTP-Posting-Host: jasper.demon.co.uk
> X-NNTP-Posting-Host: jasper.demon.co.uk
> MIME-Version: 1.0
> X-Newsreader: Turnpike Version 3.00 beta 4
<FteYrFYDwAqZV0vS3mitlZLzas>

In article <383309716wnr@naismith.demon.co.uk>, John Naismith
<John@naismith.demon.co.uk> writes
>
>
>Yes. The upgrade socket has 169 pins - the extra one to prevent
incorrect
>insertion of the Overdrive chip. Probably the main difference <g> is
that
>the socket pinout corresponds to that of a 487 co-pro chip, so you need
a DX
>chip with a 487 pinout.
>

AIUI, that extra pin on the 169-pin Overdrive is to disable the existing
CPU, not to prevent incorrect insertion.

So would it be feasible to hack the board by fitting a standard DX2 (168
pin), and then connecting the extra pin to either 5v or 0v (depending on
which is needed to disable the existing processor) with a bit of wire on
the board underside?

Must try it sometime on an old board. It would be quite a saving to be
able to shove in a 20 quid SGS DX2 and modify the board, rather then to
have to buy the Intel Overdrive product, which of course is more
expensive.

--
Mike Tomlinson
Cat Toy (n): anything not nailed down.

[Archived because at the time I was considering trying it out!]

[For those who want to have a go, I have further relevant info archived,
i.e. a detailed follow up by John Naismith, never did try it myself
though...]

--
Simon Child