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  • Getting to grips with a Rock Lobster.

    I picked up a really nice clean example of an a500+ at a car boot sale today for a tenner.
    I have to say I was really impressed with how carefully this machine was looked after by it's previous owner. It took him 10 minutes to pack it up for me after I handed over my crisp £10!
    Whilst not being "mint" it is very clean and white, much more so than you can usually expect from this age of machine.



    I also noticed that it had what appeared to be a ROM switch mounted on the side, a very neat little mod which will prove useful.



    First things first lets check out this baby and make sure she works,

    1.3 ROM boot screen


    2.04 ROM boot screen


    That's all good then.

    Stripping off her creamy top, got to check that battery!


    Not a speck of dust, how very weird,


    ROM switcher, too cool for school,


    Rock Lobster!


    Oh Noes! Battery leakage!


    Underside of battery area, this needs to be sorted fairly quickly,


    Out, and ready for a visit from Dr Solder, ably assisted by Nurse Flux.


    Now, I'm no soldering genius, but I'm fairly sure that if solder refuses to budge when exposed to temps of 480 deg C that this is going to be one tricky little job.
    I slathered the flux on like butter on a crumpet but, to no avail. I've just ordered some wick that may help draw it out.
    Dang, but I love a challenge.

  • #2
    Re: Getting to grips with a Rock Lobster.

    AWESOME!!!

    Now I can give you that CBM A501+ 512KB Chip upgrade!!!! its yours =D

    AND NOW you have a use for that 8MB upgrade too =D *sweet!*

    Now all you need is IDE or SCSI and your rollin' =D

    ------

    That battery is going to be a stubborn B to the I to the T, C and H m8.. the whole battery assembly will act like a heat sink...

    use a small pair of snips to snip the battery free, run you iron to around 430 (as you dont have a digital 5/6ths the way round )

    *give the iron an extra minute or two to catch up.... while doing so lay down flux on BOTH sides =)

    now from the TOP of the board, add the heat from the iron and (not burning your fingers) pull the legs free once the solder has melted...

    Now, remember to CLEAN well =D

    looking forward to the pics my friend
    Flux Mastah' Zee
    50 L337 1'M W1R3FR4M3

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    • #3
      Re: Getting to grips with a Rock Lobster.

      I miss my A500+.

      Damn that's one nasty looking battery! Hope you can get it out!
      -=Firthy2002=-

      Comment


      • #4
        Re: Getting to grips with a Rock Lobster.

        That reminds me to strip my A500+ down and check the battery too.

        BTW, is anything else needs if converting to a coin style battery holder? Any extra things like resisters needed?
        Coming soon - ..
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        • #5
          Re: Getting to grips with a Rock Lobster.

          Wait a minute, the motherboard in my A500 states that it's a rock lobster, but my board doesn't say it's an A500+. Were there several revisions of the same board with the same name?

          Comment


          • #6
            Re: Getting to grips with a Rock Lobster.

            Originally posted by Harrison
            That reminds me to strip my A500+ down and check the battery too.

            BTW, is anything else needs if converting to a coin style battery holder? Any extra things like resisters needed?
            No resistor, just a diode. Prefer a 1N60 (germanium unit) as they have a lesser voltage drop. Search for lithium hack on Aminet.

            Originally posted by Nathanieltolbert
            Wait a minute, the motherboard in my A500 states that it's a rock lobster, but my board doesn't say it's an A500+. Were there several revisions of the same board with the same name?
            All A500 units are "Rock Lobster", don't matter the board revision or features.
            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


            • #7
              Re: Getting to grips with a Rock Lobster.

              Cheers for the inputs guys.
              I've spent most of my evening wrestling with this battery. It certainly was a Biatch!

              Got the snips on it and removed the battery body itself, if nothing else removing the reservoir of contamination.



              That was the easiest bit! By far and away the hardest part was removing the single pin connection closest to the chip. With the corrosion, a snug fitting leg and some brutally stubborn solder it took nearly 2 hours to get the last of that out, I even used the Hot Air with some success, although I had to be very careful so as not to scorch the PCB!

              I spent another half hour cleaning up all the flux with screen wash and then mopping up and finally drying off with a hair dryer.
              I did a couple of continuity checks on some of the traces that had been blackened, and looked damaged and everyone checked out A Ok.





              I'm really quite chuffed TBH, this is the first time I've done any sort of desoldering work Solo, especially to rescue an ailing board. It was hard work, but the fact that it's done and it all works is a great feeling. One more Miggy saved from battery death!

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              • #8
                Re: Getting to grips with a Rock Lobster.

                OMG! That's an awesome repair job. Nice one Phil. I am seriously impressed. Well done m8y.

                Charlie

                PS. One of my favourite games on sceen too.

                Comment


                • #9
                  Re: Getting to grips with a Rock Lobster.

                  Great work r0jaws!

                  I dont know what to say... i dont want to sound condesending but I am rather pleased to see your first bit of unsupervised work... you have a latent talent... =D

                  This certainly was no mean feat my friend,

                  you had a huge battery acting like a giant heatsink, when you look at the bottom of the board you also have a HUGE ground plane, that again, acts as a giant heatsink!

                  you managed to remove the battery and keep the through-hole ringlets!... thats something to be chuffed at!

                  well done indeed m8y!

                  in the spirit of another sensi game... "you have advanced a tech level!"
                  Flux Mastah' Zee
                  50 L337 1'M W1R3FR4M3

                  Comment


                  • #10
                    Re: Getting to grips with a Rock Lobster.

                    Thanks guys, I appreciate the comments.

                    If it hadn't been for the patient tutelage of Zetro, the Flux Mastah, this padawan would probably have set fire to the board, table, my own eyebrows etc.

                    That Ground was difficult, which is why I thought about using the hot air (eventually).That got the solder moving. If I used the iron, nothing happened at all. I may as well have tried to chip it out!

                    Comment


                    • #11
                      Re: Getting to grips with a Rock Lobster.

                      nice job r0jaws !!!! Another amiga rescued!
                      Aacheron and slk486 are my heroes
                      A1200D mfilos ed. : ACA 1231/42 , Indivision MK2 , IDEfix Express , Subway , PicoPSU 120w custom 3.9 ROM/OS

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                      • #12
                        Re: Getting to grips with a Rock Lobster.

                        fantastic m8, really impressed, well done
                        Official Amiga Walker





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                        • #13
                          Re: Getting to grips with a Rock Lobster.

                          The Rock Lobster goes from strength to strength.

                          Received an AlfaData Alfa Power Expansion from Rudi. For those who don't know what it is, it provides upto 8Mb Fast RAM and access to IDE ports.

                          What makes it a bit special is that it has both a 40 AND 44 pin IDE connector with internal power supply available. This means that it can have an IDE hard drive and CD ROM hooked up simultaneously.
                          It can also be powered entirely by the 500, but also has a power brick for hungry hard discs, or for when you have a CDROM attached.
                          I have fitted this with a 4Gb CF Card with WB 2.05 installed, and it does not require the power brick as well, leaving you with a less cluttered desktop.

                          It also has switches on the front enable you to switch the RAM or Hard Disc on and off as you wish.







                          The only problem I have, is that I miss identified my ROMs as 2.05, I only have a 2.04 ROM! Unfortunately, that doesn't have the patch enabling it to boot from IDE. Bah!

                          However, once I get these installed, and maybe even get hold of some patched 1.3 ROMs, I'm sure she will be good to go.

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                          • #14
                            Re: Getting to grips with a Rock Lobster.

                            ROMS you say

                            Looking great r0jaws!!!!
                            Flux Mastah' Zee
                            50 L337 1'M W1R3FR4M3

                            Comment


                            • #15
                              Re: Getting to grips with a Rock Lobster.

                              Not a problem if the A500+ have just 2.04 ROM, Phil.

                              The device will boot straight away with the 2.xx ROM, but not with 1.3 without some little hack or with a slightly modified 1.3 ROM.

                              Just to remember the old times, all you need to do is setting a 1.3 partition using the tool from the A2091 install and then save changes to the RDB. This will make the first partition bootable (don't forget to put a copy of the AlfaData SCSI/IDE device into the EXPANSION drawer!). After that, all partitions you want to be available to the 1.3 ROM must be mount-listed. Pretty much the same for 2.1, IIRC. But 2.xx just need the wanted at-boot partitions saved to the RDB.

                              Have a lot of fun with this piece of retr0-licious hardware history.
                              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

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