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trencherfield

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Posts posted by trencherfield

  4. CPU upgrade x10

    in Hardware Mods

    Posted

    Tested the VCC_CORE on my scruffy workbench v1.0 for you.... reads 1.682v with bulging caps that are about to go pop in my face if I don't do 'em sooner or later.

    So should be 1.7v standard as I suspected for coppermines and the 733mhz chip. Pics following...

  5. CPU upgrade x10

    in Hardware Mods

    Posted

    11 minutes ago, Bowlsnapper said:

    YOU GOT THEM ALL FOR 117 DOLLARS!?

    Now I'm definitely pissed. Lol. Who's the seller?

    Calm down, calm down.... you're gonna pop a vessel or sommet lol

    Yeah, that's the total cost for the 3 delivered with vat to UK.

    Will take a shot of the seller for you in a mo, hang on. There is 2 on ebay there now...

    https://www.ebay.com/itm/383487331659

    Presume it's legit, but title a bit odd but does say will receive whats pictured. Different seller. Seller I used has sold out.

     

    • Haha 1

  8. CPU upgrade x10

    in Hardware Mods

    Posted

    Just had three 1GHZ 133mhz slot 1 Piii's delivered from usa. Look mint, have to see. Need to disable speedstep too of course. Will try the cheaper units first before these when I feel like it.

    Don't think it's 1.45v standard Snappy.... else there would be no need to change the VCC_CORE resistor for the 1.4Ghz. I would guess around 1.7v same as these slot 1's for Coppermine.

    I'll measure it now for you.

  9. CPU upgrade x10

    in Hardware Mods

    Posted

    8 hours ago, Bowlsnapper said:

    Wow I'm in over my head... lol

    Okay, thank you sir. I appreciate your time in answering my questions and researching this for me! All I have for the time being is hot air, so I think I would need to pick up and ACHI so that I can do this the right way. Manual heating scares me, unless there's a way to use my hot air without worry of components flying (kapton tape, probably) and heating properly and symmetrically/equally. I do have a good hot air machine: an Atten that Sweetdarkdestiny recommended.

    Also, if I choose to go the BGA route and decide to go the BGA slot processor route, is there a better way to source them than evilbay? They are so god damn expensive! but at least then I wouldn't have to use the interposer if I'm learning how to BGA solder and it would cut out a LOT of potential for error...

    Will definitely need a preheater. A hot air station will have trouble heating the board uniformly without thermal stress. The board will also sap away the heat without a preheater under it, making it harder to do the CPU.

    I have the gear & more and been making the xeniums/ogx360 for years and other chips, plus other smd stuff besides, but even I have not done the CPU upgrade. Yet. It's a mammoth task, there's no blagging around it, it's going to take time (a lot) & patience (a lot). Watch the other videos, computer booter etc. Sometimes he is not successful, sometimes he is. Nature of the task.

    I've picked up a few CPU's off ebay recently to test with in due course. It's about the best place to pick them up. You might also consider to have a P3/Tualatin PC test rig with a socket 370 board to check the CPU's first... no point soldering a duff CPU on despite what the listing states hey.

    Everything you need for this job, including the parts, gets very expensive very quickly :)

  12. CPU upgrade x10

    in Hardware Mods

    Posted

    I saw Maximus64 he has a video of his CPU upgrade on youtube. At one point (after his test motherboard) you will see him check his good board for the VCC_CORE with a multimeter and he got it spot on. This is plugged in with no cpu on the board.

    The standard voltage must be higher as the resistor value is increased to drop the VCC_CORE down to 1.45v in this instance. For your 1.75v core cpu, my guess is the resistor value will either be as it is now or lower to increase the VCC_CORE up to 1.75v.

    The equation is there, I haven't worked the equation for 1.75v though, plus I haven't checked what the standard VCC_CORE is either, so that's as much as I can offer unless someone else cares to chime in with the values for you.

    Standard voltage is prolly on the net somewhere or you can measure it with a meter, again the points to measure are prolly on the net somewhere too.

  13. CPU upgrade x10

    in Hardware Mods

    Posted

    For a 1.2 to 1.4 board as Maximus64 said...

    "I'm in process of upgrade my CPU and after replacing R2E8 to 1.5K, the output voltage still measure around ~1.55V instead of 1.45V that the CPU want. I think the resistor value feedback network mention the the manual is wrong.

    SC2688 datasheet mention the reference voltage is 1.25V
    So base on my calculation with 1.5K resistor:
    (1.25v)(1.5K + 379)/(1.5K) = 1.566V

    This is too much for the CPU since spec is 1.45V. If we want 1.45V output I think the resistor should be ~2.4K (2368 ohm to be exact)"

    There's the equation in bold to work out to the SC2688 (look at the attached pdf as it provides the VCC_CORE).

    Maybe email Lukas and ask? I have not looked into it any further myself yet. Depends on which board you are upgrading of course too, so need to know that.

    SC2688.PDF

  14. another xbox

    in General Xbox Discussion

    Posted

    When I used to sell an Xbox on ebay years ago, I waited for their £1 max fee listings or the 80% off seller fee listing as they call it too. Then use that and list as buy it now. (Don't let it renew in 30 days though if unsold as you'll pay full fees then) - set a fair price and it will often sell.

    Presume they have the same offer stateside as well? If not then that's a rough call.

  15. CPU upgrade x10

    in Hardware Mods

    Posted

    23 hours ago, Bowlsnapper said:

    Hey @zzattack, does the processor have to be 1.45V core voltage?

    I have this processor: CPU SL5QJ, 1000/256/133/1.75V, and they're only 20 bucks right now, 15 in bulk, but if I can't set the core voltage correctly (maybe with the proper resistor) then it's not usable. Are you able to offer any insight? I imagine it would just be undervolted, but I don't know if that's too much. The processors tested on Lukas's github suggest that it should be fine, but I wanted to know if I should do anything differently than say the SL6BY?

    @SS_Dave@KaosEngineer

    You going to need to match up the CPU core voltage. You can measure it after changing the resistors in the guide, if needed. There has been some conjecture over the values needed regarding this. Depends on the processor of course too. Yours at 1.75v means it's probably already about that standard? Whatever the 733mhz standard cpu runs at. I've not checked the value yet.

    https://github.com/N64-Freak/Xbox-CPU-interposer/issues/1

    Think 'Computer Booter' on youtube mentioned about this too somewhere.

    Probably best to measure the standard voltage and then depending on which board revision work out the resistor values you need, fit and meter read them until you get to 1.75v for your CPU.

     

  16. another xbox

    in General Xbox Discussion

    Posted

    11 minutes ago, Bowlsnapper said:

    I love the Carlin rant. Awesome. :)

    Fuck Ebay. I just tried to list the Halo Edition I worked my ass off on and I posted about and they whined about copyright infringement. SO much for listing it there. I can't even tell people what I'm selling and can't justify the price. I'm pretty sure the item is fucking blacklisted now anyway. I could probably post it with a blank description and they wouldn't let me list it. Now I have to figure out how to get rid of it.

    Just keep the title simple, list the hardware only. In the details again, refrain from anything but hardware spec, list it like a PC. Don't mention about dashes or software or anything. Buyers will see its a Halo edition etc. Set the price for the spec and what you want for it. You can show extras in the pics like the dash etc, buyers will look.

    Short and sweet. You'll get no bother then. Sometimes you can add a disclaimer in the details (no infringement/games etc), but I wouldn't bother.

    • Thanks 1

  18. XeniumMods v3.xx SneakPeak!

    in Hardware Mods

    Posted

    12 hours ago, NeMesiS said:

     

    Well... I've mentioned in the past that I would like to do a PWM (and FLK) fan controller to complement the dual fan caddy. The SPI2PAR would be a great place to start for this project as it has all the I2C side of things there along with the addresses for the CPU, MB and Fan. As I would like for this to be a standalone mod, I would do without all the Xenium SPI stuff. I would like for the PWM fan controller to change fan speeds on the fly by continuously checking temps via I2C, kinda like how XBMC can control the fan whilst at the dashboard. And of course, we could add small OLED display to the caddy somewhere (or externally) to show temps and fan speed much like your image above.

     

    Quite probably, the simple spi2par2019 onto a Pro Micro alone, connected to the SMB, without the Openxenium SPi connected, will still show the in game temps, game playing and fan. I don't think the Xenium Spi is required there.

    You can probably thereby, as I have done for an OLED, meddle with the code in Arduino ISE and just utilise that with a Pro Micro quite simply and pull in the registers you want to display.

    Looks like an easy starting point.

    --------------------------

    Looks like the Aladdin XT LCD conversion just runs as a Smartxx LCD, so will probably go blank in game like the others.

    https://github.com/Ryzee119/AladdinLCD

    https://bitbucket.org/psyko_chewbacca/workspace/repositories/

  19. XeniumMods v3.xx SneakPeak!

    in Hardware Mods

    Posted

    I believe psychochewbaca did release an Aladdin XT CPLD redo that can work solely as an LCD chip only, requires a TSOP flash on the motherboard also as the Aladdin takes up the LPC data bus for the LCD.

    Whether that LCD screen output includes the temps, it may well do. Just need to reprogram the Lattice CPLD and make whatever connections etc was in the guide. It will be in his repo with details.

    • Like 1

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