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Post by paulpsomiadis on Sept 20, 2006 18:41:32 GMT -5
If I manage to spot another 387SX on eBay - I'll snag it and post it to you (course you'd have to pay for it though...) As for soldering skills - I've been soldering for 20 years. ;D Like @oompa loompa said - it takes LOTS and LOTS of practice! Shouldn't that be 4-pin DIPs?
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Post by Tom Maneiro on Sept 20, 2006 23:07:23 GMT -5
The shipping to Venezuela would be DAMN expensive... Better i will keep an eye on the university trashbins...
Nop, it's a 14 (or 12?) pin DIP, but wider than a normal DIP, and it has pins only in the corners. I still have my broken socket, when i manage to take a picture of it, i will post it there.
What does the 14.31818 oscillator there? i've seen it on many old VGA cards (including PCI S3 Trios)
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Post by paulpsomiadis on Sept 21, 2006 10:33:20 GMT -5
Uhuh - and this is supposed to make me say "Oh no - expensive shipping!" and then not do it, right? WRONG! ;D I buy / sell stuff all over the world on eBay - so I'm no stranger to expensive shipping! (besides, it may take AGES for me to find another 387!) Yeah, you're right - I forgot that the sockets have 'empty' pin holes in the middle! DOH!
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oompa loompa
I AM THE GOVERNATOR
"Git 'Er Dun!"
Posts: 1,301
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Post by oompa loompa on Sept 23, 2006 0:59:54 GMT -5
btw, what are you guys going to use a 387 for? i think the only application that the 387 is good for during the 386 days are CADs, and some C compilers. i've seen C compilers require a 387 fpu, but they really don't use it
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Post by Tom Maneiro on Sept 23, 2006 10:06:57 GMT -5
Maybe a MP3 player? I tried to run mpg123 (a GPLed MP3 player), and it crashed, but i don't know why... 387 needed? Not enough RAM? Win95 detected?
Remember that MP3 put some pressure on the copro, since it uses some complex math stuff (i think).
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Post by paulpsomiadis on Sept 23, 2006 14:19:12 GMT -5
The only thing that would really benefit from a 387 on an old 386 system is maths-heavy programs... ...or maths heavy games like DOOM, etc... ;D Of course it's pointless doing this - since we all use OpenGL equivalent DOOM engines in WinXP... ...hmm - I guess I'll have to think a bit about exactly 'what' to use it for? Before this it was just "Well, I haven't got one - so I gotta find one!" But now I found one...WTF do I use it for?
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Post by GiGaBiTe on Oct 5, 2006 15:06:43 GMT -5
What does the 14.31818 oscillator there? i've seen it on many old VGA cards (including PCI S3 Trios) That sounds like the clock for the ISA bus, because if you divide the crystals clock by two, you get 7.15 MHz which is essentially the ISA bus speed.
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Post by paulpsomiadis on Oct 7, 2006 8:18:34 GMT -5
Correctamundo! Each Crystal on a 386 runs at twice the speed of the components it feeds.
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Post by Tom Maneiro on Oct 7, 2006 8:25:16 GMT -5
But why PCI video cards has that crystal? I thinked that PCI run at a different speed (33MHz). Compatibility mode?
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Post by paulpsomiadis on Oct 8, 2006 11:37:50 GMT -5
Hmm...PCI is supposed to be 66MHz... ...but maybe some older cards run at the speed of the ISA bus due to the chips used on the GFX card. e.g. Voodoo 5 came in PCI and AGP flavours. But the AGP version used the same silicon as the PCI version and also ran at 66MHz with an AGP bridge chip!
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Post by Tom Maneiro on Oct 12, 2006 11:02:36 GMT -5
Now that i have a "spare" CD burner, i will do some x-treme experiments: -Burn CDs on a P133 using Linux' cdrecord (should not be too difficult) -Burn CDs on a 386! (but, with what software? A obscure DOS-based solution?) Expect some results for the next week. EDIT: DOS CD burning program found!: www.freeweb.hu/doscdroast/index.html(VESA GUI included)
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Post by Tom Maneiro on Oct 17, 2006 10:56:53 GMT -5
Burner test results: The volunteer: a "generic" 48X12X50 CDRW (rebadged Aopen CRW4850, relative of Ricoh MP7480), firmware version 1.02 (later flashed to 1.04, quite hard to find the OEM one). It hates most CD-RWs.
On the 386 box: Test aborted, burning software refused to run due to memory issues ("not enough memory"). Tried on real DOS mode, i will try later inside W95.
On the P133 box: Had to recompile the kernel to enable SCSI support/emulation, CD-RW blanking tests OK. Also used a DOS bootdisk to update to FW1.04 (damn slow process, pretty risky, but at least my burner needed that update for improve disc reading).
So a 386 can't be used for CD burning, it seems... at least without 16MB of RAM?
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Post by paulpsomiadis on Oct 19, 2006 9:53:42 GMT -5
I would probably try it... ...but I don't have / need a SCSI CDRW drive. I just do all my burning on my Athlon system! ;D
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Post by Tom Maneiro on Oct 19, 2006 15:51:59 GMT -5
For the records, mine is a (E)IDE/ATAPI. However, on the old Linux 2.2 kernel, burners required SCSI emulation, that was a nightmare of most Linux burners out there. For me it was easy: just recompile the kernel!
Why burn on a 199x machine? It's more a proof-of-concept... and i could make a backup of my 386s harddrive (a DDed image would fit in a CD-R, it's just 504MB). However, i need more RAM!!!
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Post by GiGaBiTe on Oct 19, 2006 23:23:09 GMT -5
I'm all for vintage systems, but a 386 is just a tad too old for my tastes, and it gets harder and harder to find parts for them by the day. If I were you, I'd find some decent 486 board with both PCI and ISA slots on it (VLB if you're lucky) and proceed to deal with that board.
72 pin simms are alot easier to find in larger amounts than 30 pin ones, and generally cost less also.
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