VOGONS


First post, by BLockOUT

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I was trying to upgrade the memory on one of these boards, pcchips m577
when booted the machine it had 32mb and i wanted more.

Took out a bunch of 128mb sticks from different brand, and i had no luck, no post (sticks had memory on both sides)
placed some some 128mb sticks (with memory on one side ) and no luck, did not post either.

what i saw was that the motherboard kind of liked another stick of memory (one that has the memory placed horizontally on the memory pcb and not vertically, vertically is what you se more common)

What kind of memory should be used with this board? im using high quality brand memory and it doesnt even boot. The board is set to 3.3v in the jumper.

Reply 1 of 8, by dionb

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Orientation of chips on modules is never a relevant factor for compatibility.

What does matter:
- module type (72p SIMM, 168p DIMM)
- voltage (5V, 3.3V)
- memory standard (FP, EDO, SDRAM)
- memory type (unbuffered, bufffered, registered)
- speed rating (in ns)
- chip density (in Mbps)
- number of chips

Now, if I'm not mistaken the M577 is a board with a Via MVP3 chipset that can have both 72p SIMM and 168p DIMM slots, but they aren't always populated. MVP3 supports EDO SIMMs and DIMMs and SDRAM DIMMs in chip densities up to 128Mb, but only on unbuffered modules. It can run the memory bus asynchonously, so 100MHz RAM with 66MHz CPU or vice versa. 100MHz requires 7ns SDRAM, 66MHz will work with 10ns SDRAM or 60ns EDO. Basically the MVP3 is a slut and anything that can work will work. But it's not working for you.

So:
- confirm that this is really an M577 with MVP3 chipset - and which memory slots are present on your board
- confirm specs of the DIMMs you're using. Please take care not to mix up mb and MB (m=milli, M=Mega; b=bit, B=Byte).
- explain what you mean by that other kind of "stick". Maybe post some pics...

Last edited by dionb on 2021-04-19, 19:40. Edited 1 time in total.

Reply 2 of 8, by Repo Man11

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Since it might help and it shouldn't hurt, I'd update it to the last BIOS if you haven't already, so here's the page Jan Steunebrink's patched BIOS: http://web.inter.nl.net/hcc/J.Steunebrink/k6plus.htm

Reply 3 of 8, by BLockOUT

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hello, the 2 sticks on the left are the ones that this motherboard did recognize, but they have low capacity, the sticks on the right are the ones i tried and did not post (all of them have chips on both sides)

a1.jpg

this second picture is about all my 128mb sticks i have that are pc133. that i will have to try once i get some free time.
the ones on the left are single sided, and the ones on the right are double sided

a2.jpg

Reply 6 of 8, by dionb

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BLockOUT wrote on 2021-04-20, 00:03:
hello, the 2 sticks on the left are the ones that this motherboard did recognize, but they have low capacity, the sticks on the […]
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hello, the 2 sticks on the left are the ones that this motherboard did recognize, but they have low capacity, the sticks on the right are the ones i tried and did not post (all of them have chips on both sides)

a1.jpg

The ones that do work are clear: DIMMs with 4Mx4=16Mb chips; 16 of those makes 32MB. They are being detected correctly. They're 10ns chips, so rated to max 100MHz (maybe just 66MHz)

I'm afraid the pics of the ones that don't aren't good enough for reading the actual chips themselves on the others, but if they have 16 chips, they look like 8Mx8 chips (64Mb), which should be perfectly fine. Small chance they may have 16Mx4, which are out-of-spec, but brands like Micron and Infineon tend to stick to standards, so that's highly unlikely.

They do look a bit dirty, so I second the suggestion to clean the pins. Just get a little rubber and rub it along the pins on both sides of the DIMMs. Blow off any residue, then give them a try.

this second picture is about all my 128mb sticks i have that are pc133. that i will have to try once i get some free time. the o […]
Show full quote

this second picture is about all my 128mb sticks i have that are pc133. that i will have to try once i get some free time.
the ones on the left are single sided, and the ones on the right are double sided

a2.jpg

The 128MB DIMMs with 8 chips can only have 128Mb chips with 16Mx8 architecture. They are definitely OK for the MVP3 memory controller. The Micron and Samsung DIMMs should be excellent quality. There again, give them a clean.

One good thing to do is take a known-good board to test the DIMMs in. If the DIMMs are dead, no surprise that they don't work on your M577.

Reply 7 of 8, by snufkin

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dionb wrote on 2021-04-20, 08:22:

I'm afraid the pics of the ones that don't aren't good enough for reading the actual chips themselves on the others, but if they have 16 chips, they look like 8Mx8 chips (64Mb), which should be perfectly fine. Small chance they may have 16Mx4, which are out-of-spec, but brands like Micron and Infineon tend to stick to standards, so that's highly unlikely.

They do look a bit dirty, so I second the suggestion to clean the pins. Just get a little rubber and rub it along the pins on both sides of the DIMMs. Blow off any residue, then give them a try.

Spot of image editing, I think all three of the right-hand ones are IBM 33L3074, 128MB PC133-333 (Infineon one looks like -520 as well), 16Mx64. Searching on that IBM part numbers got me a better photo of a Hyundai part with HY57V658020BTC 75 chips, which has a description of 133 MHz 4Bank × 2M x8 SDRAM. So, as you said, 8Mx8 chips.

Reply 8 of 8, by darry

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A copy of the manual for the M577 . Probably not very helpful, unfortunately .

https://web.archive.org/web/20041107132906/ht … 00/m577v30w.pdf

EDIT : or something similar to the M577 . See https://web.archive.org/web/20040910080354/ht … cchips/aka.html
"Example: The PM 9900 from Amptron has no mouseport and no PS/2 simms, but it is otherwise identical to the M577."