Something old and Something new (386 build)

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Re: Something old and Something new (386 build)

Postby chrismeyer6 » 2018-7-12 @ 02:23

Your build is very nicely done and has seriously piqued my interest. I'm looking forward to your next update
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Re: Something old and Something new (386 build)

Postby Anonymous Coward » 2018-7-12 @ 04:03

You're lucky you didn't burn out the cache. If you have a 66MHz DRx2, I highly suggest you not try 80MHz.
For 50MHz FSB, your best bet is to get a TI486SXL2-50. By default those work with a 1X clock, and the cache will work without a problem.
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Re: Something old and Something new (386 build)

Postby Phido » 2018-7-12 @ 04:19

chrismeyer6 wrote:Your build is very nicely done and has seriously piqued my interest. I'm looking forward to your next update


I will keep things updated here with major developments. My OCAU thread is my actual build log. I put everything in there, when things arrive, problems, tribulations etc.

I now too have found the extensive chipset manual for this chipset and not just the 2 page summary. Hopefully this will help me resolve some of the mysteries of this setup. Although from casual glance it is still pretty abstract and unusual.

You're lucky you didn't burn out the cache. If you have a 66MHz DRx2, I highly suggest you not try 80MHz.
For 50MHz FSB, your best bet is to get a TI486SXL2-50. By default those work with a 1X clock, and the cache will work without a problem.


I won't be trying 40 or 50mhz bus with the DRx2. I will be trying the 25Mhz and perhaps the 33Mhz bus. I expect 50Mhz is probably doable. I think 66Mhz is probably as far as it will go. I will only be using it with active cooling. From what I can see the clock doubling doesn't dramatically improve performance like it did on the 486's, the caches are too small, and you are still trying to suck through an ISA bus. Which even at higher speeds is going to be pretty slow.

Unfortunately doesn't seem to be many Ti486Sxl2-50's around. I have a PGA168 version, but that isn't particularly helpful.

My actual aim of this build is to explore the difference performance between co-processors and 386 and 486DLC. It isn't to build the fastest PGA132 setup. I find the 386 pretty fascinating and the format is quirky. Which is again why I went for a Chips & Tech board, quirky.
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Re: Something old and Something new (386 build)

Postby feipoa » 2018-7-12 @ 08:32

Phido wrote:Some 64kbx4 chips ordered.. I am curious. As I said there are no jumpers on this board. I guess I just pop them in and the chipset does its thing.

I'm not so sure about that. I've always had to set jumpers on 386 boards with different cache sizes and configurations.
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Re: Something old and Something new (386 build)

Postby feipoa » 2018-7-12 @ 10:06

Phido wrote:Wouldn't mind trying a 87.5Mhz crystal and splitting the difference and getting the best of all worlds hopefully.

I have had trouble finding a properly sized crystal oscillator between 80 and 100 MHz. 90 +-3 MHz would be ideal. Anyone know if these exist? Any links?
Last edited by feipoa on 2018-7-12 @ 17:36, edited 1 time in total.
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Re: Something old and Something new (386 build)

Postby Anonymous Coward » 2018-7-12 @ 11:22

These exist, but not in the package you want. They normally come in a square can instead of the rectangular one. I have one on a small adapter PCB that was custom made by the Chinese seller I bought it from.
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Re: Something old and Something new (386 build)

Postby feipoa » 2018-7-12 @ 17:37

That sounds unique. Do you have a photo of this PCB?
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Re: Something old and Something new (386 build)

Postby Phido » 2018-7-13 @ 12:21

So I am pretty sure I am the only user here with a 386 now with L1, L2 and L3 Cache.. Or with 196kb of cache.
Cachechk doesn't detect my l1 onchip..

Image
Image

So I am now pretty sure it is down to what ever tag chip you stick in. If it doesn't get what it wants, anything is possible.
If only I had that BIOS. It had registers for this.

I am pretty sure I can get 32mb working on this board just need more 4mb 9 pin ram. It doesn't like mixing 4mb and 1mb sims, again, bios issue.

Quirky.
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Re: Something old and Something new (386 build)

Postby Anonymous Coward » 2018-7-14 @ 03:08

feipoa wrote:That sounds unique. Do you have a photo of this PCB?


No, but if you give me about 10 days, I can take one.
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Re: Something old and Something new (386 build)

Postby Phido » 2018-7-14 @ 15:48

Further digging has found.
https://bjheins.wordpress.com/2015/11/2 ... oard-1991/

Which was last updated april 2018. Seems to be the origional source of the bios screen shots.
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Re: Something old and Something new (386 build)

Postby Anonymous Coward » 2018-7-18 @ 07:41

I sent a message. No reply.
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Re: Something old and Something new (386 build)

Postby feipoa » 2018-7-18 @ 07:46

How long ago did you send a message?
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Re: Something old and Something new (386 build)

Postby Anonymous Coward » 2018-7-18 @ 09:03

I think about a week ago.
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