VOGONS


First post, by lowlytech

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I have a packard bell 386 machine that has a 386 chip that looks like it is socketed. I have never messed with a chip like this and thought I would ask before I tried to remove it from the mainboard. I would like to put a 33Mhz DX chip in there as it is currently a sx-20.

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Last edited by lowlytech on 2017-04-01, 16:04. Edited 1 time in total.

Reply 1 of 12, by gdjacobs

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Please take a photo of the clock gen to the right. Some motherboards don't have a pll and require a different crystal to change clocks.

All hail the Great Capacitor Brand Finder

Reply 3 of 12, by lowlytech

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Hal, do you know any other info on this board? Like what kind of cache ram I am assuming goes in those two 28 pin sockets? I vaugly remember another post here on the forum where someone put the wrong cache in and it smoked and blew up.

gdjacobs, here is the pic of the generator I think you wanted. The fact that it is 40MHz pretty much gives it away that we are stuck at 20MHz I assume?

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Reply 4 of 12, by Anonymous Coward

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This is a really awesome setup. You have a removable 386SX CPU and cache. I've never seen them together like that. Please show more photos. Can the motherboard be adapted for other cases?

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 5 of 12, by gdjacobs

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Crystals can be replaced, so theoretically 25mhz is possible on this CPU assuming the ISA bus doesn't clock synchronously and explode.

All hail the Great Capacitor Brand Finder

Reply 6 of 12, by lowlytech

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I took a few photos with my better camera of the board. I don't know if this loosely follows the LPX standard or not, but that 4 ISA riser card might be a bear to move into a different case.

Here is the link to the photos I saved on google drive..

https://drive.google.com/drive/folders/0B2u7G … M1E?usp=sharing

Does anyone know where I could possibly get documentation for this board? I would love to know what the jumpers do, and what my options are for adding cache. I assume those two chips near the front of the board with the -25 are cache, and the -80 is the video ram.

Reply 7 of 12, by lazibayer

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lowlytech wrote:
I took a few photos with my better camera of the board. I don't know if this loosely follows the LPX standard or not, but that […]
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I took a few photos with my better camera of the board. I don't know if this loosely follows the LPX standard or not, but that 4 ISA riser card might be a bear to move into a different case.

Here is the link to the photos I saved on google drive..

https://drive.google.com/drive/folders/0B2u7G … M1E?usp=sharing

Does anyone know where I could possibly get documentation for this board? I would love to know what the jumpers do, and what my options are for adding cache. I assume those two chips near the front of the board with the -25 are cache, and the -80 is the video ram.

You are right. The board has 16KB cache. I guess the two empty sockets are for another two 8K x 8bit SRAM chips.

Reply 8 of 12, by lowlytech

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I don't know much about cache, but would this be the chips I need to upgrade the cache?

http://www.ebay.com/itm/IDT7164S25P-CMOS-Stat … %3D391377191204

Reply 9 of 12, by Anonymous Coward

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You know, you can buy TI 486SXLC-40 and 486SXLC2-50 CPUs that will fit into your CPU socket.

Make sure you don't buy the V or G series though. You need to verify it's a 5V model.

Usually -040 indicates a 5V 40MHz model, -G40 would be 3.3V core with 5V I/O at 40MHz, and -V40 would be pure 3.3V 40MHz.

I *think* this TI 486SLC will work, but I would verify the part number:

http://www.ebay.com/itm/TX486SLC-E-33PAF-Texa … GsAAMXQ1ZhTf0Wq

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 10 of 12, by lowlytech

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A.C., thanks for the heads up with the cpu upgrade option. I will keep that in mind.

Any other thoughts on the cache upgrade from the previously posted ebay link? I just am paranoid that I will let the magic smoke out if I get the wrong thing.

Reply 11 of 12, by Anonymous Coward

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You need this:

http://www.ebay.com/itm/Chip-Winbond-W2465AK- … 6YAAOSwB-1Y25xx

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 12 of 12, by lowlytech

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Thanks so much for pointing me to the proper cache chips to order. Got them on the way, however after reading a snapshot of this motherboard from the wayback machine it is saying I need a CACHE32.COM file to be able to enable the extra cache. Any ideas where I might find this file?

https://web.archive.org/web/20000313020622/ht … b55/PB55ovw.asp