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Desktop 1200 PPC Upgrades, a picture story.

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  • Hey,

    installed a BVision, Blizzard PPC 603e/68060, 192 MB RAM and a 20 GB SSD into my Amiga 1200. The BVision got an extra fan installed.

    I got the problem that the Amiga 1200 cant boot completely cause of power shortage. Neither the original A1200 power supply, nor the A1200 power supply, nor the bequiet SFXPower 300 ATX 300 Watt power supply (soldering the according pins to the Amiga 1200 power cable), nor the Yuan-Kee YK-063 ATX 150 Watt power supply (soldering the according pins to the Amiga 1200 power cable) cant boot the Amiga 1200 completely.

    But ....

    a stone old IBM API 3186S 100W AT Power Supply (soldering the according pins to the Amiga 1200 power cable) boots the Amiga 1200 perfectly and it runs using the BVision for hours w/o any hang or crash at all. But I like to put the power supply into the A1200 power supply housing, so that it looks like the original A1200 power supply.

    I read here that anyone uses the PicoPSU internally and its getting its 12 V external from some PC Notebook power supply.

    So my 3 questions are:

    - Which PicoPSU exactly are you using (there are a lot of different models out there) ?
    - Which external 12 V power supply are you using for the PicoPSU?
    - And finally: Is there anything i still could check with my existing power supplies (the bequiet SFX 300 and the YK-063)? I also tried to build up some power usage at the 12V rail by connecting some 20 W bulb to it, cause It thought that the Amiga draws to less power from thos "intelligent" ATX power supplies. But the Amiga 1200 still havent booted.

    BTW When I power the Amiga using this 2 ATX power supplies I first got a grey screen, then the screen goes black. And all the time the Amiga 1200 Power LED lights green, but I cant turn on the Caps Lock LED at all (which is absolutely possible using the AT power supply from the first second on).

    Thanks a lot in advance for any useful hints or information.

    Comment


    • ATX PSU's are stabilizing 3,3V line where old AT stabilizing 5V line.
      That is why you are successful with AT PSU.
      But pico PSU are also ok if used inside A1200 case.

      Comment


      • Hey stachu, so could this mean that i built up some power usage at 3.3 volt and the power supply would work fine?

        And I thought about adding the PicoPSU inside the Amiga power supply case. But you mentioned I should place the PicoPSU inside the Amiga casing. Is there any advantage of placing it near the power consuming parts?

        Thx for your help.

        Comment


        • The pico-PSU comes in at least three "flavours": 60, 90 & 120W.

          All rails are regulated but the 12V, which is passed through and must be provided with from the external power source (with loads of Àmperes, where "loads" means more than 15).

          Remember the external 12V source must provide it regulated and stabilized, too.
          David Bradley made Ctrl+Alt+Del, Gates turn it mandatory
          16 Amigas at home
          3x C= 64
          1 VIC-20
          8 PC (argh) at least one is an AROS/Amithlon unit

          Comment


          • Originally posted by RacingDaysR View Post
            Hey stachu, so could this mean that i built up some power usage at 3.3 volt and the power supply would work fine?
            Good idea. Adding an external load of 0,5 - 1 Ohm and connect all 3,3V lines together (one of them is 3,3V sensing line) should be fine.

            Originally posted by RacingDaysR View Post
            Is there any advantage of placing it near the power consuming parts?
            Yes: shorter cables and lack of power plug in between (lower resistance).

            Comment


            • Originally posted by stachu100 View Post
              Good idea. Adding an external load of 0,5 - 1 Ohm and connect all 3,3V lines together (one of them is 3,3V sensing line) should be fine.?
              K, thx. Will try that next week.

              Originally posted by stachu100 View Post
              Yes: shorter cables and lack of power plug in between (lower resistance).
              K, but the power cable isnt that large and the plug itself shouldnt be much of a resistor. I like to try it outside the A1200 first cause of the thermal problems which would be connected with the CorePSU (there is already the BVision and the BPPC board as some huge thermal source inside my Amiga ). If it wont work stable, then I install it internal.

              ---------- Post added at 09:54 ---------- Previous post was at 09:51 ----------

              Originally posted by rkauer View Post
              The pico-PSU comes in at least three "flavours": 60, 90 & 120W.

              All rails are regulated but the 12V, which is passed through and must be provided with from the external power source (with loads of Àmperes, where "loads" means more than 15).

              Remember the external 12V source must provide it regulated and stabilized, too.
              Hey rkauer,

              there are some PicoPSU with 125 W and 150 W. But I should use the one with 120 W i presume?

              And thx for the help with the external PSU. I will get one with 12 V and at least 15 Ampere (if I cant solve the problem with the existing PSUs)

              Comment


              • Originally posted by RacingDaysR View Post
                but the power cable isnt that large and the plug itself shouldnt be much of a resistor.
                U=I*R
                Assuming that A1200+BPPC+BVPPC+some other stuff inside consumes about 7A peak and resistance of cable+plug+cooper tracks from power plug to BPPC is just 0,1Ohm the result is stunning...

                Comment


                • I need to revive my own system!

                  that is what I need to do to my very basic A1200D!

                  Comment


                  • What an incredible thread, kudos to the OP and his mates helping along the way. I know this is an "old" thread, but its new to me Love all the photos!

                    My journey so far with my 2 A1200's have had similarities...recapping (the smell from leaked caps - ewwww), playing with the Blizzard PPC card.....that frustrating BVision card, and its burning hot chips (some people report no heat on them....not mine! simple heatsink isnt enough to keep the heat to a reasonable level). The new Indivision MkII CR just squeezes in with the BVPPC without modification, and the new EZKey also works with the Indi CR without modification.

                    My case modification has been limited to squeezing 1 A1200 into a desktop Digital PC case (we all should remember that brand!)...and the other A1200 original desktop bodging the hole for the CF card above the PCMCIA slot. Im waiting on OS4.x to give that a run soon

                    Some great ideas for locating various connectors inside the original case, some good cooling ideas, some impressive new and old casework too!

                    I know its been a long while since it started, has the OP persisted with the project or moved on?
                    Ash
                    A1200 ACA1221 & 1221lc, A600 ACA620/Vampire II Black, A500,A500+ & A500++ ACA500+ Vampire II, A2000 Re-created with TF534, VIC20 / C16 / C64 / C64 Reloaded
                    I'm a memory collector. I collect stuff that elicit good memories from my past - nostalgia

                    Comment


                    • Hi mate!

                      very nice Work! I want do build something like this. But the very important question is: which pico-psu did you used, and how you connected it. Have you some hints for me please ?

                      Comment


                      • Man thats lovely.
                        I never knew that the ppc accel cards were a thing.
                        now I want one!

                        Comment


                        • Originally posted by srosefx78 View Post
                          Man thats lovely.
                          I never knew that the ppc accel cards were a thing.
                          now I want one!
                          Yes and there is a new type of PPC available for the Amiga 3000/4000 with Mediator/Prometheus PCI Busboards which use a PCIPPC Card allowing for faster PowerPC processors to be used, sadly not yet and may not be achievable on the Amiga 1200 so the BPPC is still only the way to get PPC power on a A1200.

                          @stachu100 Sometimes sell them on here, he also repairs/upgrades both the BPPC & CSPPC too
                          Got too many Amigas, Think I gotta problem

                          Comment


                          • So, yeah, what is the final PSU solution then, sorry - I have lost the track
                            Was that mini ATX or Pico-atx?
                            Could someone pls specify exact model please

                            Comment

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