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Thread: Original CIA chip (391078-01) - not PLCC, for A1200

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    Default Original CIA chip (391078-01) - not PLCC, for A1200

    Hi,

    (disregard the title for this as it is misleading, thanks @Sveta. It should more accurately say "not PLCC socket")

    I am looking for an original (to be soldered) CIA chip (391078-01), with contact pins, for an Amiga 1200 motherboard. This is in order to use an adapter over the chip to provide wireless USB keyboard functionality (had mine placed in a socket as part of an upgrade, due to various miscommunication with the seller of the adapter which indicated that it was for the *keyboard MPU* on U13 and not the CIA-A chip on U7). As such I am in a bit of a dilemma and I see replacing the chip in the PLCC socket (and removing the socket) as the only option to fix this.

    Appreciate any thoughts and offers.


    Click image for larger version. 

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    Last edited by Drag0nFly; 2nd December 2019 at 17:05. Reason: another correction

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    Hi,

    PM with offer. Btw. A1200 has only PLCC version 8520 ICs. (your title is wrong "not plcc, for A1200")

    Regards, Sveta
    Last edited by Sveta; 30th November 2019 at 13:33.

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    Just to further clarify, as all the chips I am seeing for sale are for use with mounting in a socket; I need the type with pins for soldering onto a PCB. I.e, *not* this:

    Click image for larger version. 

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    In other words, an identical chip to what is on every unmodified A1200 mainboard (first picture in this thread), as mounting an adapter on these which sit in a socket is nigh impossible as the contact pins are not exposed.

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    Hi,

    Yes. I have PLCC 8520 IC On your photos is 8520 PLCC in extra PLCC socket. This is not original.

    All A1200 MB has original/factory direct soledered without this socket.

    PM. Photos via PM sent.

    Regards, Sveta
    Last edited by Sveta; 1st December 2019 at 19:45.

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    @Sveta, thanks for the offer and your help, but I feel we're talking past one another here. The only reason I wanted to replace the chip was to use it with an adapter, which is impossible when it sits in a socket (hence the reference to the original CIA chip and the first picture in the thread). So I would need to de-solder the socket and solder in a CIA with contact pins (sourced from an unmodified A1200 mainboard) and put that in place instead.

    See below picture which shows USB-keyboard adapter mounted on top, on an unmodified non-socketed motherboard (piggyback, similar to Indievision for the Lisa chip). Also sent you a PM with this info.

    Click image for larger version. 

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    Last edited by Drag0nFly; 2nd December 2019 at 17:06.

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    Hi,

    OMG

    You have on your A1200 PLCC 8520 in PLCC socket and this is due probably swap/fix with new 8520 BUT here is not possible plug any adapters on 8520 chip due socket. You must before unsoldered socket and soldered 8520 direct to board.

    8520 DIP is only for A500, CDTV or A3000, A2000

    Regards, Sveta
    Last edited by Sveta; 1st December 2019 at 20:04.

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