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  • Amiga 500 Keyboard Membranes

    How much interest would there be in replacement Matsumi A500 keyboard membranes at £20 each? - I would need to order 250 to get that sort of price (!) so this is only tentative at the moment.

    Would these also fit the A500+ ?

  • #2
    Will fit in A500+, it have the very same keyboard.
    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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    • #3
      Unfortunately I'd have to say that £20 is a bit steep, though I understand why it would be hard to get the price down. Otherwise I think replacement membranes are a great idea, for other models too.

      Note that not all 500 membranes are the same as 500+. Some have the extra large return and shift keys instead of the blank/international keys.

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      • #4
        This would help also: Those membranes will fit in later C= A4000 and Escom A4000T keyboards too, the Mitsumi ones with spring coil for key recoil, not to be confused with the rubber dome ones (mostly found on A2000, A3000 (T) and early C= A4000D that use a circuit board instead of a membrane).

        There spring coil ones are basically the same keyboard than the one of the A500 but with few minor differences.

        ---------- Post added at 00:29 ---------- Previous post was at 00:24 ----------

        Note: the above mentioned spring coil A4K/T Mitsumi keyboards all have the extra blank/international keys.

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        • #5
          This is always the problem with the Amiga - which keyboard membrane to produce - I am not sure which A500 one I have - I presume it is the A500 keyboard without the extra blank key (the left hand shift button abuts the Z key) - is that what you mean?

          Is that the wrong model, would it be better to produce them for the A500 with the extra shift key - in which case, I need another A500 keyboard and membrane !!

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          • #6
            This is the keyboard I have already - which model is it though?

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            • #7
              ALL Mitsumi A500 keyboards have the same membrane, disregarding the number of keys over it.

              On larger Enter/Shift keys the unused contacts are simply covered by the larger keycaps and the actuators are not installed.

              The "rubber coil" keyboards might use membranes or PCB circuits, but the membrane units have the very same connection to the interpreter circuit of the A500 with minor differences in the hardware. The membrane will be always the same.

              As far as I knowthe most needed membrane is the green A600 (Mitsumi, again), which is poor in reliability.
              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


              • #8
                I don't think that's correct. There are at least two types of A500 membrane, mitsumi part numbers 56 A619A and 56 A619B.

                The A part does not have contacts for the extra keys and I'm not sure everything else lines up perfectly either. I can't actually check this at the moment because the ones I replaced have been returned to their owners and I sent the faulty ones to TheRogue who thought he might be able to clone them.

                There is also a third type which has a different two part connection to the controller board, not sure about its key contact layout.

                @Rwap the one in your pic has the big keys, I guess you better open it up to check whether or not it has unused contacts on the membrane.

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                • #9
                  What I know for sure is the one with extra contacts will fit in the ones with less contacts without any problem.

                  The ones with two connectors are not Mitsumi, they are made by Samsung.
                  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


                  • #10
                    Originally posted by rkauer View Post
                    ALL Mitsumi A500 keyboards have the same membrane, disregarding the number of keys over it.

                    On larger Enter/Shift keys the unused contacts are simply covered by the larger keycaps and the actuators are not installed.

                    The "rubber coil" keyboards might use membranes or PCB circuits, but the membrane units have the very same connection to the interpreter circuit of the A500 with minor differences in the hardware. The membrane will be always the same.

                    As far as I knowthe most needed membrane is the green A600 (Mitsumi, again), which is poor in reliability.
                    OK thanks - I will have a look to see if it has the extra contacts - presumably under the Enter key and the bottom left shift key ??

                    I can look into A600 membranes too - but need a keyboard unit and membrane to do this!

                    Comment


                    • #11
                      rkauer is saying the membrane for the two mitsumi 500/+ keyboards are interchangable,hes not saying that there is a contact under the bigger keys.


                      i dont know if you can interchange them though as the key contact/plunger is in the centre of the key,and would put the contact in the wrong place on the membrane.
                      i do have both as ive just repair two just to find out but it is a bit of a pain to take apart two keyboards find this out.
                      i have got too much hardware,it would only hurt your eyes to look at it here

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                      • #12
                        Originally posted by roy_bates View Post
                        rkauer is saying the membrane for the two mitsumi 500/+ keyboards are interchangable,hes not saying that there is a contact under the bigger keys.


                        i dont know if you can interchange them though as the key contact/plunger is in the centre of the key,and would put the contact in the wrong place on the membrane.
                        i do have both as ive just repair two just to find out but it is a bit of a pain to take apart two keyboards find this out.
                        I have just taken a couple of photos (attached) - I agree - it does look as though the two membranes are not interchangeable, as you can see underneath the larger shift key, there is only one contact on the membrane and it is pretty much in the middle of the key - therefore there would not be enough room to add a second contact for the blank / international key...

                        That is a real shame - I can't see that there will be enough of a market to justify getting two different keyboard membranes made for the two types of keyboard (or maybe I am wrong?)

                        Which membrane is more likely to be required ? If its the one with the extra keys, then I will need to borrow another keyboard and membrane for that to get the tooling correct



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                        • #13
                          That there is the A part, as luck would have it I still have one knackered B part. I can send this to you if you want.

                          Looking at the area from your close up, my one has one key contact to the left and one to the right, I guess the return key is similar. Assuming the rest of the keys are lined up I think the the B membrane would work on A keyboards except for return and left shift keys. Maybe you could make an adjustment like a second contact in parallel for those keys so it would work?

                          Let me know if you want this membrane.

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                          • #14
                            Many thanks - PM sent as it would be interesting to see if there could be some way of making the A and B type membranes as one...

                            I am informed that the A type is the most common anyway (and the version which works with the A500+) (luckily)

                            If someone has an A600 keyboard and membrane, I could also look at getting membranes for that - how many versions of the keyboard exist??

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                            • #15
                              Having met with the guys from the membrane manufacturer this morning, and thanks to the B type membrane received from jimbob, this is looking positive.

                              They think that it should be quite feasible to merge the two membranes so that one membrane will fit both keyboards - although it is of course subject to checking everything!

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