Wow, I haven't seen one of those since middle school!

You'll need something like this, officially:

This is basically an entire Intel 486 with an active, built-in FPU. The CPU has an extra pin on it to prevent it from being used in a regular Socket 3, uh, socket.

If you can take the original CPU out and replace it, just do that, as the 487s are quite rare and very pricey:

https://www.ebay.ca/itm/Intel-i487-SX-math-co … ~AAAOSwPAxaBQBp

I'm not sure if you can put an ODPR in there (a cursory glance shows the extra pin as on a 487) but if you can, I would go that route - more speed at a cheaper price.

Wow, I had that exact computer when it was new. Did not have sound card and CD-ROM from factory, added that myself later using a clone SoundBlaster 16 (honestly don't remember the exact brand, just that it wasn't Creative) that came in a "Multinedia Pack" which included the drive, sound card, and Microsoft Encarta '95. Good times. Gonna have to see if I still have that gem of software.

To your question, the required chip is exactly what is shown in the manual: i487SX (or, 80487SX which I think is not technically correct). Quick eBay search yields fairly few results though...

Jed118 wrote:

Wow, I haven't seen one of those since middle school! […]
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Wow, I haven't seen one of those since middle school!

You'll need something like this, officially:

This is basically an entire Intel 486 with an active, built-in FPU. The CPU has an extra pin on it to prevent it from being used in a regular Socket 3, uh, socket.

If you can take the original CPU out and replace it, just do that, as the 487s are quite rare and very pricey:

https://www.ebay.ca/itm/Intel-i487-SX-math-co … ~AAAOSwPAxaBQBp

I'm not sure if you can put an ODPR in there (a cursory glance shows the extra pin as on a 487) but if you can, I would go that route - more speed at a cheaper price.

Any way to get around that extra pin ?

If your 487 socket has the extra pin then go for an overdrive CPU. My IBM Eduquest Model 50 which was an SX-33 is now a DX4-100 thanks to that socket. I still have a DX2-66 overdrive if yours has that extra pin.

Yes, I found an Overdrive CPU on ebay
50mhz !

I could never afford one back in the days.

The Overdrives are really nice. My main retro 486 PC has one. It would otherwise be running at 25 MHz and not upgradeable without the special Overdrive socket it has!

In my case, it's the DX2ODP50, which is an i486DX2 50 MHz.

Fit that in, and, assuming your RAM is up to par, it will run almost every game and office program from the '92 - '95 era. 😁