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Hardware projects / Re: Z820 mobo hack. anyone?
« Last post by holopovvv on Yesterday at 03:27:55 am »
Hi there. If you interesting, one aliexpress seller sells adapter for usual ATX power supply but the price is very high
https://www.aliexpress.com/store/product/PSU-ATX-Power-Conver-Cable-24-Pin-to-18-Pin-8-Pin-to-8-8-6/215107_32778125250.html?spm=2114.12010612.0.0.5294Zq

Этот адаптер не работает, по крайней мере у меня плату не запускает. Покупал на taobao за 17$.
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Hardware projects / Re: Z820 mobo hack. anyone?
« Last post by holopovvv on June 21, 2017, 09:13:04 pm »
Что конкретно интересует? Я успешно запустил свою систему hp z820.
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Hardware projects / Re: Z800 version 003 extracted BIOS image
« Last post by mtothaj on June 20, 2017, 04:10:15 am »
Hi everyone. I've tried this image and it works. Thanks for the image.
I've started with z800 rev 002 stock BIOS chip, not working with 56xx processors. Tried to flash it in place (without any soldering). And I've got interesting result - I am able to erase the chip, but can't write new image to it.
So the BIOS was spoiled and I proceeded with the long way. I've unsoldered the chip and tried to flash it separately, but it was still read only (or maybe I've had some issues with my programmer). I've had some new spare chips, and flashed the image to new one without any errors. And now motherboard boots with 56xx processors, and has new boot block.

Congratulations on a succesfull boot block upgrade.
it is also my understanding / experience that certain regions of the stock bios HP bios chips have write protect enabled at the bios chip level during the course of the original factory programming. Thus, even with an unlocked descriptor and the relevant jumpers on the board in place attempting to write to the stock HP bios chip usally throws up an error at c.a. 25-30% progress bricking the machine in he proces. For this reason replacing the bios chip is the only viable option I am aware off to change the bootblock.
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Hardware projects / Re: Z800 version 003 extracted BIOS image
« Last post by 429076 on June 20, 2017, 01:57:10 am »
Hi everyone. I've tried this image and it works. Thanks for the image.
I've started with z800 rev 002 stock BIOS chip, not working with 56xx processors. Tried to flash it in place (without any soldering). And I've got interesting result - I am able to erase the chip, but can't write new image to it.
So the BIOS was spoiled and I proceeded with the long way. I've unsoldered the chip and tried to flash it separately, but it was still read only (or maybe I've had some issues with my programmer). I've had some new spare chips, and flashed the image to new one without any errors. And now motherboard boots with 56xx processors, and has new boot block.
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Hardware projects / Re: Hacking an HP Z800 motherboard into a standard PC case
« Last post by roadrage99 on June 18, 2017, 08:56:01 am »
I am piecing together this project now,  i have everything in the case and hooked up.  my issue is that when i plug in the PSU, the CPU heatsink fans immediately kick on and never go off, power button is unresponsive.  i have tried removing the power button cable and the same issue persists.  The PSA is an EVGA 850 G2.  Anyone have a suggestion for this one?

Thanks
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Hardware projects / Re: An easy to build android/bluetooth reflow controller
« Last post by Andy Brown on June 11, 2017, 12:51:59 pm »
Your oven is super-accurate throughout the whole profile, better than I've ever achieved and I thought mine was good. I particularly like the way that yours heats from the top and bottom at the same time. Best reflow oven I've ever seen, well done!
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Hardware projects / Re: An easy to build android/bluetooth reflow controller
« Last post by DeNew Lab on June 07, 2017, 06:21:51 am »
The first check of the stove.
Thermoprofile is excellent.
The result. 12 lamps of 1500 watts. 3 connected in series.
Sorry for the mess ... :-[

https://www.youtube.com/watch?v=A_tCNhYqNXg&feature=youtu.be

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Hardware projects / 512k Memory Board Usage
« Last post by Ken K on June 03, 2017, 11:55:00 am »
06/03/17

I am using an Arduino Mega and have installed a 512k memory board in it.  I have figured out how to write and read single point data to and from the board.  I have also figured out how to use it with single dimensional arrays.

I need to find a way to load 2 dimensional arrays to the board.  How do I tell the complied where I want the array using a pointer??

Ken
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Just wanted to point this out incase other people missed it, but after lots of research into wondering why one of my USB 3.0 cards wasn't achieving full speed I finally discovered that PCI Express Slot 3 is NOT PCI Express 2.0. It is 1.1, so it runs at half the speed.

All the other PCI Express slots on the board are 2.0... just not that one. Very weird.

So after pouring through the Intel schematics and docs, I finally figured it out. Others might have already known but it didn't really click until just now.

Our board is a Dual IOH board, which means it has two I/O Hub controllers (the 5520 chipsets). I only thought boards could have one chipset like this, but I guess I learned differently now.  ???

Each Intel 5520 can support 36 PCI Express 2.0 Lanes in x16/x16/x4 configuration. The ICH10R (southbridge) I/O Hub provides an additional PCIe 1.1 interface at x8 width and a traditional PCI bus, not to mention 12x USB 2.0 ports, 6x SATA II, and audio.

On our machines, the gigabit ports are connected to the southbridge I/O hub via PCI Express x1 for each port, and the firewire is attached to the traditional PCI bus.

I found a block diagram in a publication that HP released comparing the Z800 to the Z820. I modified it to add which slot is which on the diagram and am attaching it to this post.

There are a few things I found puzzling about the design:
  • Slot #4 should be a full x16. My hardware scanning utilities haven't found any other x8 devices attached to that IOH so I am perplexed as to why HP nerfed a slot to x8 when it didn't really need to. Would it really save that much money? Maybe they couldn't find a way to fit 8 more lanes on the PCB between the IOH and the slot?
  • It seems Slot #7 and the SAS Controller share a split x16 on the second IOH. If that's the case, where is the x4 from that hub? Why couldn't they make Slot #3 use these lanes instead of the ones from the southbridge that are slower? I hope the answer is engineering and not cost savings cause that would be aggravating.
  • Between the gimped Slot #4 and missing x4 on IOH #2 it seems like we could actually squeeze two more perfectly good PCI Express slots out of this motherboard.... which would be nice cause I currently need them.  :-[
10
Just wanted to point this out incase other people missed it, but after lots of research into wondering why one of my USB 3.0 cards wasn't achieving full speed I finally discovered that PCI Express Slot 3 is NOT PCI Express 2.0. It is 1.1, so it runs at half the speed.

All the other PCI Express slots on the board are 2.0... just not that one. Very weird.
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