Re: Adding 3.3v to pci (Beta)

Posted on 2022-08-23, 05:51

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I like it, but they tying of 3.3v aux to 3.3v power makes me a little nervous. Only a little though. For systems following PCI <= 2.1, 3.3v aux is marked as reserved, so it should not be present and using this shouldn't cause any problems. for PCI > 2.1, the 3.3V aux signal is present, but the 3.3v …

---

Re: New Socket 8 VRM project

Posted on 2022-08-23, 05:42

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Question: where did you source your pin header connector? You don’t happen to have part numbers for this and the pentium 1 variant do you? I decided to go with a external psu for a few reasons, parts availability, ease of assembly, greater range of parts quality depending on what user was trying to …

---

Re: New Socket 8 VRM project

Posted on 2022-08-23, 00:11

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

pentiumspeed wrote on 2022-08-22, 23:52: Cool RussD, What's your background? Cheers, My day job is mostly embedded software, but I end up doing a lot of hardware stuff. My undergrad degree is a combination of cs and ee. My hobby projects usually involve a PCB somewhere.

---

Re: New Socket 8 VRM project

Posted on 2022-08-23, 00:05

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

As far as a multi-phase VRM, it's just overkill for this. Measuring the in-system ripple with the CPU at full load: PXL_20220822_234707035.jpg The budget by Intel for the full system is +/- 5% or 165mV. This is the full budget though, including regulator set point tolerance. There is a ripple …

---

Re: New Socket 8 VRM project

Posted on 2022-08-22, 23:25

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Best way is design the 3 phase VRM. Much more efficient and can be oscillating at higher frequency and smoother DC for the processor, most especially overclocking success. The motherboard does not have enough capacitors for CPU, you need to add at least 3 polymer capacitors to the VRM's output. The …

---

New Socket 8 VRM project

Posted on 2022-08-22, 22:53

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I'd been having trouble with my dual socket pentium pro motherboard and modern ATX power supplies. The 5V rail just sucked too much at powerup and caused the power supply over current protection to trip. There's three solutions to this, buy an older power supply that allows some droop an the 5V …

---

Re: Adding 3.3v to pci (Beta)

Posted on 2022-08-22, 20:32

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I like it, but they tying of 3.3v aux to 3.3v power makes me a little nervous. Only a little though. For systems following PCI <= 2.1, 3.3v aux is marked as reserved, so it should not be present and using this shouldn't cause any problems. for PCI > 2.1, the 3.3V aux signal is present, but the 3.3v …

---

Re: micron w6li botched bios update.

Posted on 2022-08-19, 08:34

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is a method to update the BIOS. You need to create a special loopback parallel port dongle and a crisis diskette. Early in the boot process it checks for the dongle and if it sees one it will flash from the crisis diskette. https://www.kontron.com/downloads/application_notes/phlash_sc_e113.pdf

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-18, 00:16

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, there's only one thing left to do. Grab a new jumper out of the parts bin and try it out. PXL_20220818_000044080.jpg Well, there you go. And as for that jumper: PXL_20220817_235749522.jpg TL;DR, a jumper was not making contact and programming the clock chip to run in test mode, putting out a …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-17, 23:58

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So my next step was trying to figure out what event or clock the memory controller (DBX) wasn't receiving to advance through this delay. I pulled up the pinout for the DBX again, expecting to find some low speed clock it was using, or some event signal from the PMC. But nothing. Just a single clock, …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-17, 22:40

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OK, so I see 1ff8, 1ff9, 1ffa, 1ffb, 1ffc, 1ffd, 1ffe, 1fff, 1fe0, 1fe1, 1fe2, 1fe3, 1fe4, 1fe5, 1fe6, 1fe7, 1fe8, 1fe9, 1fea, 1feb, 1fec, 1fed, 1fee, 1fef, etc. Looking around it looks like rather than doing accesses for the instruction it's executing right now, its just looping through the …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-15, 22:17

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The sequence of reads in series of addresses is stuck in start up mode trying to read or moving the bios firmware to memory? Make sure the reset circuit works that does reset all the chips including processor. When processor is reset, processor will loop all the addresses over and over if there is …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-15, 18:35

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Geez, after this the BIOS just stops running.lets take a look at the cacheline that's indicated, 2020h-203fh: gnome-shell-screenshot-bxlsh.png ??? The only DRAM access there is a read, it looks like that read is just hard locking the system. This is not what I was expecting at all, and I thought …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-15, 18:04

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thought about this for a while, and did a lot of starring at the flash chip. I did finally notice the ISA slot sitting right behind it. So long as the chipset isn't doing anything fancy, any and all memory accesses to the physical region covered by BIOS should be visible on the ISA bus. Probing it …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-12, 17:52

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At this point, I think I've gone all in on the "if all you have is a hammer, everything begins to look like a nail" theory of debugging. I have a logic analyzer, I have a memory module wired up, the correct solution is clearly to wire up the remainder of the memory module to see if there's errors …

---

Re: Adding 3.3v to pci (Beta)

Posted on 2022-08-12, 08:29

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For the curious regarding how this comes about since PCI slots are keyed, as mentioned before the key is just for signalling, not power. Here's the 2.1 spec: gnome-shell-screenshot-fxvkbk.png And here's the 2.2 spec: gnome-shell-screenshot-cwmklq.png So if you have a 2.1 or prior motherboard with 5V …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-10, 18:29

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fortunately, the ZIF socket makes probing quite a bit easier as it holds one end for you: PXL_20220810_175857039.jpg So 64 beeps later, we have...no new information. It probes out fine. This is starting to drive me batty. Maybe there's something inside the chipset where it's not writing or reading …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-10, 18:28

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So the first cycle should be used to detect if BEDO DRAM is present. The 440FX documentation doesn't specify how that's done, but seeing as how a cycle was done to enable burst mode on BEDO DRAMs, but hav no effect on non-BEDO DRAMs, a burst cycle will be done and the data for the second cycle will …

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-10, 18:06

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

(Removed duplicate post)

---

Re: Debugging a Micronics W6-LI POST failure

Posted on 2022-08-10, 17:32

by

by RussD

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The next step according to the flow chart should be enabling fast refresh and then normal refresh. gnome-shell-screenshot-1i126h.png Fast refresh s a very obvious section of the capture as you can see the incrementing address bits cycling through the memory space: gnome-shell-screenshot-gxkp1r.png …

---