it probably did belong in that socket, this is compatible with most 486 sockets;

mrau wrote:

it probably did belong in that socket, this is compatible with most 486 sockets;

It was filling maybe half the socket pins. The outer row of holes wasn't even populated.

I've always been under the assumption that PGA169 is socket 1, your basic 486 upgrade socket. 486 CPUs don't populate every pin of socket 3, mine has the outer row completely visible to the eye.

Random image stolen from google:

So what you have there your basic dx2 overdrive..

Your processor is mentioned here, DX40DP75.
http://philipstorr.id.au/pcbook/book5/overdriv.htm

This should explain the reason for the extra row of pins on 486 sockets: https://en.m.wikipedia.org/wiki/Pentium_OverDrive (refer the section "486 sockets").
As I recall, the 169 pin socket was used as an "upgrade" socket on some 486 motherboards (for the 487SX or 486 "Overdrive" or ODP processors). More on the difference between ODP & ODPR here: http://www.cpu-collection.de/?tn=0&l0=co&l1=I … =i486+OverDrive
For more info on the 487SX: http://www.cpu-collection.de/?l0=co&l1=Intel&l2=FPU#A80487SX

jesolo wrote:

This should explain the reason for the extra row of pins on 486 sockets: https://en.m.wikipedia.org/wiki/Pentium_OverDrive (refer the section "486 sockets").
As I recall, the 169 pin socket was used as an "upgrade" socket on some 486 motherboards (for the 487SX or 486 "Overdrive" or ODP processors). More on the difference between ODP & ODPR here: http://www.cpu-collection.de/?tn=0&l0=co&l1=I … =i486+OverDrive
For more info on the 487SX: http://www.cpu-collection.de/?l0=co&l1=Intel&l2=FPU#A80487SX

AST 486SX won't make any signs of life, not sure where to start?

That's the machine it came out of. What socket was that?

Sadly, I burned the machine a month ago due to corrosion and the fact everything was proprietary, and it made no signs of life. Looking back, I bet it was jumpered to use the overdrive socket that I depopulated. I've just come to the horrifying realization that I might have burned a fixable machine.

Damn.

TheAbandonwareGuy wrote:

jesolo wrote:

AST 486SX won't make any signs of life, not sure where to start? […]
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AST 486SX won't make any signs of life, not sure where to start?

That's the machine it came out of. What socket was that?

Sadly, I burned the machine a month ago due to corrosion and the fact everything was proprietary, and it made no signs of life. Looking back, I bet it was jumpered to use the overdrive socket that I depopulated. I've just come to the horrifying realization that I might have burned a fixable machine.

Damn.

Refer the last post that akula65 made in your other thread - he also provided a link that will provide more information.
However, based on the information provided, it would appear to be your standard upgrade socket that also supports a Pentium Overdrive CPU (which is what the extra row of pins are for).

Like I said on Amibay... this cpu isn't a Pentium overdrive but 486DX-4 75MHz one. Runs on default 25MHz bus and has multi of 3X. Can replace 486SX or 486DX 5V on the motherboards that support overdrive cpus - has to have one additional pin in one corner. There are other 486 overdrive cpus that go into original PGA168 pin socket - they have ODPR in the name. Pentium overdrives go into socket 2 and 3 with 237 pins that standard 486 doesn't use - outer side pins.

Read more here:
https://en.wikipedia.org/wiki/Intel_80486_OverDrive

and about Pentium overdrives for Socket 2/3 (486 to Pentium) and Socket 4/5 (early Pentium motherboards to faster Pentiums):
https://en.wikipedia.org/wiki/Pentium_OverDrive