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  • #31
    THe A500+ Trapdoor will expand the chipram to 2MB max using a 1MB expansion card, plugging in an A501 512K expansion will give you a total of 1.5MB Chipram.

    TC
    Ritchie Blackmore's Rainbow June 2016, I Was There

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    • #32
      Finalizing the explanation: the stock A500+ comes with 1Mb of CHIP RAM and no Fast RAM at all.

      Official RAM expansion for this machine will add one more Mb to it, totalizing 2Mb. Using a half Mb from normal A500 works.

      No fast RAM expansions for A500/500+ where made from Commodore.
      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

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      • #33
        Originally posted by matt020 View Post
        Righto, so does this mean the A500+, out of the box, adds any ram added via trapdoor to chipram, or does a mod have to be done?
        The A500+ has a 2MB Agnus part (8375, I think) with 1MB of that on the motherboard and any RAM inserted into the trapdoor is added to the ChipRAM, to a maximum of 1MB more.

        The card I sent r0jaws has the RAM as 4x256K SIMMs, so it seems reasonable that you can add RAM in 256KB increments.

        @r0jaws: How is the old Rock Lobster, hopefully the RAM expansion is doing the business for you!
        Thinking about accelerating your A1200? Check out my buyer's guide.

        Projects past and present: Amiga 2000/030 | Amiga 3000/040 | Amiga 4000/060

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        • #34
          Originally posted by rkauer View Post
          Official RAM expansion for this machine will add one more Mb to it, totalizing 2Mb. Using a half Mb from normal A500 works.
          I could be wrong, but I think some unofficial original A500 trapdoor expansions do not work with the A500+. I think that may be the case with at least some revisions of the official Commodore A500 expansion as well, but I am not sure.

          Also, I have a feint recollection that memory added via the trapdoor on an A500+ can be configured as fast ram via a jumper on the A500+'s motherboard (maybe near the Fatter Agnus?), but I could be wrong. That doesn't sound technically feasible, I would have expected the jumper to be on the expansion, but maybe there is an option for the first meg to be chip and everything else to be configured as fast?

          Any ideas?

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          • #35
            Finally got round to testing out Andy's expansion in my 500+.

            He's obviously a man who takes care of his stuff, as the expansion and packaging are in tip-top condition! Cheers buddy.

            This is an expansion that was aparently designed with the 500+ in particular in mind, so as long as the SIMMs are Ok, it should all be good.

            A couple of photos of the case;


            A lovely simple, no fuss expansion,

            Front,


            and Back,


            Slide her in, smooth as silk. MMMMmmmmmmmm.


            A lovely final screenshot, showing a fully pimped out 500+. 2 Throbbing Mb's of Chip with a sexh side of 8Mb Fast.


            It does make a difference. All windows render that bit more quickly and she is much more usable thanks to that.
            Definitely a good value purchase, and I'm loving it.
            Now, to get KgLoad installed and I'll be a very happy miggy monkey.

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            • #36
              Awesome! I'm really glad it's working out for you. I had no FastRAM in my A500+ so that additional 1MB of Chip made a huge difference at the time. Enjoy your plus, they're lovely machines!

              Also, I've never seen an available graphics mem that begins with a 2, it's always down to about 1.9 or 1.8 before I've even started! You must have a seriously lightweight Workbench setup there, particularly since the Fast looks pretty untouched too! What's your secret?
              Thinking about accelerating your A1200? Check out my buyer's guide.

              Projects past and present: Amiga 2000/030 | Amiga 3000/040 | Amiga 4000/060

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              • #37
                Some hints: don't put in the DEVS:/Monitors/ too much icons, they steal memory.

                Don't add too much buffers for the partitions: they steal FAST memory. Or Chip, if no FAST is available.

                Add the Fast RAM memory as soon as possible, so chip memory will be spared from resident programs.

                Prefer to use autoconfigurable memory expansions, they make the FAST RAM available at cold boot (don't need to call some "AddMem" program).
                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

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                • #38
                  Does the A500 have same battery leakage problem?

                  Hi

                  I've just picked up a mint, boxed A500 along with a similarly well looked after A1200 in a pretty sweet eBay deal.

                  Is it possible the A500 will suffer the same battery leakage issue that plagued your plus machine?

                  The A500 still has its warranty seal intact. Is it worth breaking the seal (I'm guessing the warranty is no longer valid this far on... LOL) to check if the battery is contaminating the mother-board?

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                  • #39
                    onboard battery is only in 500+ model, classic A500 can have battery on expansion ram board, so you can check it without breaking the seal
                    Chain`s H.Q. - Amiga Repairments
                    (DIY kits, repairs and more...for reasonable prices)

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                    • #40
                      Thanks.

                      Glad to know it's something I don't need to worry about.

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                      • #41
                        A500

                        Nice 500 buddy the battery looks a bit past it though .

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                        • #42
                          Recently purchased a very clean A1200 boxed and the seller GAVE me a boxed A500 for my trouble. The case needs a severe dose of retrobrighting so when i strip it your thread will be of great help so a BIG thankyou for sharing
                          Will everything work fine without an installed battery or is the coin battery hack an absolute must ?
                          A500 (rev 6b ks 1.3 1mb retr0brighted)
                          A600 (4gb cf HD, 1mb expansion, 2mb sram card)
                          A1200 (rev 2b, 80gb hd, Blizzard 030 / 50mhz 128mb ram)

                          The road to perfection is permanantly under construction

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                          • #43
                            You're fine without it altogether TBH. But replacing it does mean that Workbench can keep time.

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                            • #44
                              I just purchased one of this 500+ on ebay and pay
                              Last edited by Sardine; 29 November 2016, 07:23. Reason: no prices discussion.

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                              • #45
                                Anyone know a good place to learn soldering and repairs? I've been looking for course locally (Melbourne, Australia) but haven't found much as yet.
                                Only Amiga Makes it Possible!

                                A1200, Indivision MKIICR, Blizzard 1230 IV 32mb
                                A500 rev 6a, ACA500+ 42/8mb, Indivision ECS, 512k ram exp, broken Roctec Roclite Ext FDD

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