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Thread: Different versions and revisions of Amiga 1200?

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    iddqd's Avatar
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    Default Different versions and revisions of Amiga 1200?

    What are the differences of the various revisions of the motherboards of Amiga 1200?

    Also, are there any differences between a "Made in UK" and "Made in Philippines" Amiga 1200?

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    Math inside Amibayer! BLTCON0's Avatar
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    Quote Originally Posted by iddqd View Post
    What are the differences of the various revisions of the motherboards of Amiga 1200?
    That's a weird story, better ask something more specific. If you're looking for the most easily obtainable, generally "foolproof" board, that's probably the 1D.1 with an 1D.4 sticker (i.e. 1D.1 PCB factory-upped to 1D.4 specs) but everyone has their own experiences.

    Also, are there any differences between a "Made in UK" and "Made in Philippines" Amiga 1200?
    No. Maybe they have different shades of green on the PCB. If you're asking if one is "better built" than the other, I have no idea, but I wouldn't think they're any different that way, either.
    Last edited by BLTCON0; 10th May 2015 at 21:15.

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    iddqd's Avatar
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    Quote Originally Posted by BLTCON0 View Post
    That's a weird story, better ask something more specific.
    Well, I'm just looking to be educated, and was hoping there would be a write up or wiki somewhere going through this, as I'm (almost) new in the Amiga scene. (For some reason I only used my Amiga 500 to play games, and wasn't interested back then in the "nerdy" tech details that I am now)

    Anyway, thanks for the info.

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    Math inside Amibayer! BLTCON0's Avatar
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    The thing is even a given revision can be different in various production runs. In a nutshell:
    Named revisions are:
    1A, 1B, 1C, 1D, 1E and 2B. 1C is likely the 1D precursor and 1E a precursor to 2B, so you won't come across them.
    1D has subrevisions: 1D.1, 1D.2 (very uncommon), 1D.3 (uncommon), 1D.1 -> 1D.4, 1D.4 (Commodore version), 1D.4 (Escom version)
    2B also exists as a Commodore version and an Escom version.
    Due to the series of 1D subrevisions, the timeline is most likely 1D.1 < 2B < 1D.4, so 2B is not necessarily more recent than 1D.4, there's some overlapping.

    1A has full clockport headers (may interfere with some expansions) and "incorrect" resistor values for the audio circuit (1.5 kOhm instead of 680 Ohms)
    1B is rather solid, one full clockport row instead of two (may still interfere), audio resistors corrected
    1D.1 / 1D.4 are the most common, 1D.1 also exists factory upped to 1D.4 as already stated. A visible difference is "pure" 1D.4's don't have a link wire which is visible on 1A through 1D.1 boards. Upped 1D.4s do have it.
    1D.4 Escom version usually lacks the RDY signal for the floppy drive, having replaced it with the CHNG signal. There's a link wire underneath between pins #2 and #34 of the floppy connector. Disconnecting it from pin #2 and resoldering it to pin #1 of the external floppy connector brings the board back to Commodore specs and allows genuine Amiga drives to be used correctly. The same applies to 2B Escom version, although strangely some are identical to the Commodore ones (no wire) and don't need any modification.
    1D.4 has a detachable mouse port, so does 2B but in the form of a plug-in board.

    Some 1D.4 boards have the partial clockport header on the left side of the row instead of the (correct) right side. Factory blunder, but can be corrected with some desoldering/soldering.
    2B boards have solder spots for a header to easily connect an Amiga 500 keyboard, bypassing the handicapped A1200 keyboard controller that way.

    Lisa chips have been produced by Commodore, HP and NCR. They're functionally identical but plugging an Indivision 1200 scandoubler/flickerfixer can be a hit and miss deal with respect to proper contact. Everyone has their own story with this, but generally the Commodore version is more likely to work "out of the box" without sanding the Indivision socket. The MK2 version is supposedly more tolerant.

    Budgie has been produced in two versions, earlier boards may consistently have the -01 version, with later boards it's more or less random.
    (If you want to get very geeky, even the plastic casing and the LEDs have undergone two revisions :P )

    Complete Escom systems (with the floppy-handicapped 1D.4 or 2B boards) also don't have a genuine Amiga floppy. After fixing the board, it must be replaced or converted for Amiga use.
    Genuine Amiga floppies for the A1200 usually come from Chinon, Teac, Panasonic and maybe Epson. The keyboard comes exclusively from Mitsumi and the keys are identical to the A500 Mitsumi ones, so if perfect colour matching isn't an issue replacements may be obtained from A500 ones. In fact, the A1200 keyboard plastic base has a crossed-out "A500" engraving.

    All revisions have a PCMCIA reset problem, there exist both hardware and software fixes.
    All systems more or less function well on a basic level. When pushed by expansions etc problems may occur, this has gained the collective name "timing bugs". For a rather thorough treatment of the subject, consult this page. Some history on the subject also here.

    Some other info and photos here.
    And some more info and photos here.
    You'll see more subtle differences on the photos: Modulator size, power filter shape, RAM chip size. Just look around.

    Some ideas on floppy modifications (convert PC floppies for Amiga use) here.
    The AmiOracle section here is also a good source of general info.

    This will keep you busy for a while Just keep reading and you'll soon get past the "overwhelmed" stage. Any other question, ask away and someone will likely jump in.

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    iddqd's Avatar
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    Wow, big thanks! A lot of info there. This will keep me a long while.

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    Sorry to dig up an old thread, but I did quite a bit of searching trying to identify my new replacement board. It is a 1D (period, without no subrevision). Is this correct, or is it actually a 1d1 board? See the attached picture. I have little or no info regarding this when it comes to compatibility, stability issues and the like. So if it is an 'ugly duckling' revision I would like to know...

    Click image for larger version. 

Name:	a1200_1d.jpg 
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    Math inside Amibayer! BLTCON0's Avatar
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    It's obviously correct, the pics in BBOAH have also been recently amended with a "pure" 1D board courtesy of Dave Haynie.
    They both have late 1992 datestamps, so it may be that a small initial 1D batch was made.
    Perhaps you could post a full photo of the board?
    Stability/fixes-wise I wouldn't expect it to be much different from 1D.1, that is mostly trouble-free. Only look into fixes if you encounter specific problems.

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    Thanks for the input, @BLTCON0. I have done some tests with the board, and I notice that E123C & E125C have also been removed. Did not check the Budgie rev. yet, but I assume it is probably Rev0.
    It seems to not be as picky with accelerator cards as the 1d4.

    I can post a full photo if it is of interest!

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    A photo is always of interest!
    Especially to see if any particular factory rework has been done. At times it feels as though every A1200 that came out of the production line had its own personalised reworks done (ok slight exaggeration here ).

    As for revision pickiness, I think so too, although it's barely possible to make any sound predictions when it comes to the A1200

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    I've added some pictures of this rev. 1d (period) board now - sorry for the delay.

    btw. I'm experiencing a very curious issue with it when compared to my other rev. 1d4 board: the middle mouse button does not work with this board(!). (LMB/RMB both work, in both CN1+CN2 ports, no other issues with mice or joysticks were detected). Could it be bad CIAs, or a different issue? The board was supposed to be 100% working (refurbished)

    Anyway; I hope the pics are of some use!
    Attached Thumbnails Attached Thumbnails IMG_9502.jpg   IMG_9503.jpg   IMG_9504.jpg   IMG_9505.jpg   IMG_9506.jpg  

    IMG_9507.jpg   IMG_9508.jpg   IMG_9509.jpg   IMG_9510.jpg  

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