The fpu should be readily available on ebay. Check for intel 387sx, IIT 3C87SX/XC87SlC, ULSI Math Co US3C87 or Cyrix Fasmath 83s87.

http://www.ebay.com/itm/1pc-N80387SX-IC-N8038 … 4wAAOSwEgVWSvMU
http://www.ebay.com/itm/1PCS-CX83S87-33-JP-Ra … d0AAOSwB09YS3LM

I have a few lying around, but they're all ones with PINs, not the socket type here. Nothing on Polish eBay either (allegro.pl).

*edit Thank you!! I am now waiting 4-6 weeks for an NPU to come from China (I bought the Intel type) - good price too!

Came in tonight - Thanks, Anonymous Coward!!

http://imgur.com/a/HzNlI

Now just waiting for that extra megabyte worth of SIPPS to come in, and an 80 MB hard disk.

Missed my chance at a $25 8 bit soundblaster this morning, which would round out this system quite well.

Scorched Earth does seem to play noticeably faster though!

Wow! This is a real retro system... and in very good condition too! I like the old ATi cards... I even think some of their earlier cards were graphics co-processors rather than standalone.

That is a serious amount of DIL sockets for a 386 board... are you populating all of them?

Not seen SIPP's in ages... what speed are they out of interest? *The overclocker in me asks*

I did receive the SIP RAM finally, but the BIOS will only see them (1024K) OR the 4Mb installed on board - It will not work, even though the manual states that it will work with 2 banks of 256K RAM: When the jumper to invert banks 1 and 0 to 2 and 3 (for SIP use, as per manual) it just turns on to a blank screen. If I put the jumper back to bank 0 and 1 as primary (DIP banks) it beeps at me. If I remove (all...) the 41000 chips, it will POST with the SIP memory. Really, without the Quickset software, I can't seem to make it work, even though I manually set the type of RAM in BIOS, as well as the interleave. Oh well, 4Mb is PLENTY of RAM for this system, and I know I have some SIPs that work.

Either way, my 85MB hard disk didn't come in, but a 420, 850, and a 340MB came in from auction, all in rather terrible shape. The 850 spins up then stops, the 420 is riddled with bad sectors and noisy, and the 340 had to have a pin resoldered (see pics) as well as the jumper block repaired. It will work as a slave only, and even then has a few bad sectors and behaves oddly (during NDD, it will slow down to a crawl at regular intervals, only to wake up again) - I plopped this drive into the 386 for now, put Windows 3.1 and WPWIN 6.1 on it (so far so good) and a few games to free up my 40 MB in anticipation that one day it will get an era-correct secondary. I also put in an OPTI soundcard (919 I think, can't check, system is installing WPWIN from diskettes as I type this) but one day I will put in a Soundblaster 8 bit - I missed my chance at an auction for one for $25! This doesn't really lend the system to period-correct, but it does work for now.

In this picture, I soldered a diode in line to both drives' activity light, so the current only flows towards the LED and not into the other drive - Both have diodes in line and I made it modular so when I replace the 340 with a more appropriate drive, it'll be plug and play.

http://i.imgur.com/KdHNoDK.jpg

This is the connector on the ST-157A, I used an old power LED motherboard connector for the jack:

http://i.imgur.com/5TrBJ2E.jpg

Here's the MOBO with all the RAM installed - Two SIPs are Samsung 80NS, the other two are Goldstar, also 80NS

http://i.imgur.com/wMgOpl0.jpg

This is the NEC 340Mb drive after some surgery - One pin was broken off, so I cut the plastic down (luckily it was on the top row) carefully and soldered a diode leg to it - Presto! You can also see an orange wire soldered onto the jumper block there, that was broken off.

http://i.imgur.com/Rybqdvd.jpg

Here it is alongside my other computers (an ever problematic Cx486 - Top left, to the right a nice clean P166 (I'll make a post about it separately), bottom right is my P4 NAS, and beside that my VLB 386DX40) - All of the others get switched through a KVM. The tetris-like arrangement is due to the fact that my wife needed a desk to study on, and this kind of works. The 386SX gets its own monitor, keyboard and mouse, partially because it all came as a kit (with the Raven 24 pin printer below it!), and partially because the LCD monitors I have don't like the VGA Wonder signals, and also the mouse is a bus mouse - No way to route that through a KVM. I also have a PPRO200 (Dell) not shown, and a 486DX2/66 still in Poland waiting to be flown in and thoroughly rebuilt.

http://i.imgur.com/78OiK0R.jpg