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Thread: overclocked my 386 - w00t

Started 2 months ago by Mike Chambers
i was feeling a bit daring tonight. i've been sitting here all day getting Debian 3.0 Woody all set up on my 386DX 20 MHz beast here, and decided this was just a little too slow. i remembered i also have two other long-dead 386 mobos, and one was 40 MHz. i desoldered the 40 MHz crystal on my working board, and replaced it with the 80 MHz crystal on the dead mobo. swapped the AMD 40 MHz CPU to ...
Site: The Vintage Computer Forums  The Vintage Computer Forums - site profile
Forum: Later PCs  Later PCs - forum profile
Total authors: 6 authors
Total thread posts: 16 posts
Thread activity: no new posts during last week
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Other posts in this thread:

Anonymous Coward replied 2 months ago
I'd be a bit cautious overclocking if the board you are using is an older model. I think the early VLSI chipsets were not always happy about running out of spec, and often times you will see the maximum rated speed stamped onto their surfaces. Not to mention, older boards might not allow you to adjust dividers that control operating speed of ISA or DMA, or insert extra wait states for DRAM and ...

TandyMan100 replied 2 months ago
Dood, you just got a 386 running faster than my 486DX-2!!! Nice!!

Old Thrashbarg replied 2 months ago
Quote: Dood, you just got a 386 running faster than my 486DX-2!!! Nice!! I think you may have misread... CPU speed is half the oscillator speed. An 80mhz oscillator gets you 40mhz CPU speed. It would be quite a feat to get a 386 clocked up faster than a DX2 of any sort. Anyway, how's the ISA speed and such? I'd presume it was running at 1/3 CPU ...

southbird replied 2 months ago
Quote: Originally Posted by Old Thrashbarg did the modification affect anything else, like the RTC or whatnot? ... this reminded me of a malfunctioning Celeron board I found in the trash once. It only booted occasionally, and when it did, the RTC was ticking minutes by in seconds. I have no idea why, but I ...

Mike Chambers replied 2 months ago
Quote: Originally Posted by Anonymous Coward I'd be a bit cautious overclocking if the board you are using is an older model. I think the early VLSI chipsets were not always happy about running out of spec, and often times you will see the maximum rated speed stamped onto their surfaces. Not to mention, older boards might not allow you...

Mike Chambers replied 2 months ago
Quote: Originally Posted by Old Thrashbarg I think you may have misread... CPU speed is half the oscillator speed. An 80mhz oscillator gets you 40mhz CPU speed. It would be quite a feat to get a 386 clocked up faster than a DX2 of any sort. Anyway, how's the ISA speed and such? I'd presume it was running at 1/3 CPU speed, so did ...

Old Thrashbarg replied 2 months ago
Interesting. I was sorta eyeing one of those boards on eBay, wondering if it could be upgraded to a faster CPU... or rather, work reliably with an upgrade. Good to know that it will.

Mike Chambers replied 2 months ago
Quote: Originally Posted by Old Thrashbarg Interesting. I was sorta eyeing one of those boards on eBay, wondering if it could be upgraded to a faster CPU... or rather, work reliably with an upgrade. Good to know that it will. actually, to be honest i would reccommend against this motherboard. the performance is ...

Anonymous Coward replied 2 months ago
Hmm, looks like you have a mid model 386 board. Everex boards are generally known to be of pretty high quality, but as you mentioned it doesn't offer much in the way of cache or memory expansion. The C&T chipset was a pretty good choice for 286s, but I'm not very familiar with their 386 chipsets. What kind of BIOS is on this thing, are there any options you can set? My AMI 386 board with 1990 ...

Old Thrashbarg replied 2 months ago
Ah, right, I was thinking it did have cache... maybe it was a different board I was thinking of, then. In any case, the memory expansion thingies aren't particularly hard to find . Still doesn't seem to add any cache, though.

 

Top contributing authors

Name
Posts
Mike Chambers
5
user's latest post:
overclocked my 386 - w00t - Page...
Published (2009-10-16 17:11:00)
Quote: Originally Posted by Old Thrashbarg Ah, right, I was thinking it did have cache... maybe it was a different board I was thinking of, then. In any case, the memory expansion thingies aren't particularly hard to find . Still doesn't seem to add any cache, though. thanks for the link! thinking about getting it, but i might as well just go for a new motherboard really. decisions, decisions.. lack of cache really gives a nasty...
Old Thrashbarg
4
user's latest post:
overclocked my 386 - w00t - Page...
Published (2009-10-17 06:42:00)
Yeah, all things considered it would probably be a better option to just upgrade the whole board. One thing that might be worth looking at, is the Everex EV-1816 from the same seller. It's another one of those that only officially supports 20 or 25mhz, but it seems that can be worked around fairly easily. It does have cache... up to 256KB if Statson is correct, and it's cheap.
Anonymous Coward
3
user's latest post:
overclocked my 386 - w00t - Page...
Published (2009-10-17 10:24:00)
That EV-1816 is a weird board. It has sockets for cache both on the motherboard and the memory expansion card. I think you'd be better off with a board more like this one: http://cgi.ebay.com/Motherboard-w-In...item48372c2969 I don't necessarily agree with the price, but it looks like a good board. You'll notice that the battery is a bit leaky. If you're patient, you will eventually find a similar board with a better price....
ZOBEX
2
user's latest post:
overclocked my 386 - w00t - Page...
Published (2009-10-26 00:39:00)
Now that you guys posted it, I was following up some leads this weekend and found home garage junk sale. Picked up TWO NOS never assembled Jameco flip top cases. Then I asked if they had any other stuff and she pointed out pack to the family trash pile. Buried in the leaves and mud, literally, were two complete XT systems and a complete 386/486 convertable system where the MB will take either a 386 or 486 chip. I remember those when they were...
TandyMan100
1
user's latest post:
overclocked my 386 - w00t
Published (2009-10-15 13:10:00)
Dood, you just got a 386 running faster than my 486DX-2!!! Nice!!
southbird
1
user's latest post:
overclocked my 386 - w00t
Published (2009-10-15 15:09:00)
Quote: Originally Posted by Old Thrashbarg did the modification affect anything else, like the RTC or whatnot? ... this reminded me of a malfunctioning Celeron board I found in the trash once. It only booted occasionally, and when it did, the RTC was ticking minutes by in seconds. I have no idea why, but I suspect it had problems...

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