VOGONS


First post, by Sphere478

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Rank l33t++
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l33t++

Hey all, I have some pc150 sdram two sticks, one single sided, one double sided. They are hard to find, I keep looking but can never seem to find replacements so I am considering getting them repaired by someone with the proper tools and experience.

I have heard that you can’t use memtest86+ to determine which chips have failed? Is that true? Is there a way to track down the failed chips before disassembly?

Is there a source for all new chips?

Luckily the two bad sticks that I have are a 128mb and a 256mb and I would be perfectly happy with two single sided sticks of 128, so if too many aren’t bad, that would mean I already have the spares I need.

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Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 1 of 1, by zwrr

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Rank Newbie
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Newbie

As I saw in an article before, you can check the last digit of the memory address reported in memtest86 to determine which memory chip is faulty.

The correspondence between the last digit of the address and the memory chip ID:

ChipID.jpg
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There are two ways to arrange the chips on SDRAM memory modules:

SDRAM.jpg
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According to the identification U1, U2, etc. on your photo, it seems to be in the order of 1, 5, 2, 6, 3, 7, 4, 8.

486DLC-40, 386-VC-H, 32MB, GD5429, ES1868F


X5-133, HIPPO-15, 32MB, Riva 128, ES1868F


5x86-120GP, SYL8884, 32MB, Trio64V+, ES1868F


Pentium MMX-233, T2P4, 128MB, TNT2, SB16


Tualatin-1.4G, 694X, 512MB, G400, Voodoo2, SB AWE32