Difference between A4000 Rev C and D

[Misser]

question are there differences. I've sold one of my rev c and selling the other in a bit. During questions from buyers I noticed a thing.

It's always about battery and caps and audio. My last answer was:

I checked the sound and there are no issues (besides me using a faulty scart cable) It's the proper audio level you would expect. No crackling or low levels.

Seems the caps are not replaced, but totally no leakage hence the audio being fine also. I've used this amiga for the last 2 year on a daily basis. Seems the rev C 4000 uses the expensive components because my other rev C didn't show any problems either. Most problems reported are with the rev B. But then again those are sold way more than the rev C.

So the Rev C is rare compared to the Rev B, that could explain the failures reported on Rev B being higher but why are there besides a few incidences no reports about Rev C.

Hmm maybe I need to improve my google skillz.

 

[ajk]

Revision B is the most common model with the NiMH barrel battery and five SIMM slots (one also for chip RAM). Revision D is the later model with a coin cell battery and only four SIMM slots (always 2MB chip RAM soldered on-board).

Rev B is the one which will most likely have bad to catastrophic battery leakage on the entire left side of the board, Rev D essentially can't have any (though caps might still be failing, as with any model).

Revision D boards are also relatively rare and aren't for sale that often. As for the revision C, it must be some kind of intermediate board made for a short while in between.

Which one does the C resemble most?

 

[Misser]

Hi nice info. Looking at the pictures Rev C looks indeed more like an inbetween rev B and rev D. Aka no spots for cpu and fpu. Check my pictures and for prosperity sake I might dissemble the rev c and make an overall picture. Seems I never owned a rev D just a few rev B's and two rev C's

Disregard my first post about rev D and replace it with rev B

*edit
The last time I saw sfm cpu and fpu was in my A3000T-040. The refurbished 040 board I offer for sale with A4000D actually came from that machine.

 

[ajk]

Yes, if you can be bothered, it might be worthwhile to take good photos of the rev C board and send them to the "Big Book of Amiga Hardware" or similar archive I've got a rev B and D but not C.

 

[Misser]

@ajk.
I sold my last the rev C to qq1975b but requested to make some pictures while caps are replaced. So with some luck they will be made. Linking him to this topic via pm.

 

[lostrego]

@All:

Note that there are also some sub-versions of the Rev.B motherboard.

I've seen "Rev B", "rev D" and "Rev F" sub versions of the very same Rev.B type of boards.

The sub-version is usually marked by a sticker next to the Super Buster chip followed by some bar codes, serial numbers and such, but the PCB real version is ink printed on the board next to the Ramsey chip.

Don't know what are the differences between them but I guess that are only minor fixes, for instance mine is a Rev. D sub-version and it lacks the diode added to one of the the ricoh RTC chip pins that other sub-versions have.

Also I've seen that Rev.Bs could have Super Buster 9 or 11 , soldered or socketed, I guess that many of the sub versions have something to do with that.


But definitely that sub-version variations haven't anything to do with the Rev D or CR motherboards a those are a totally different kind of beasts.

 

[Buzzfuzz]

No no no :-D

The revision of the board is on the board it self, in the photo above in the top right corner.

The sticker saying C or F is actually for the card it was shipped with, so A3630 or 3640!

Amiga 4000D revisions of the board is either B or D-CR.

The revision C is extremely rare, I think Tahoe has one, he also has the A3400, the prototype of the A4000D.

 

[lostrego]

@Buzzfuzz:

If there where only C and F subversions of the B , then why mine is a Rev.B board with "Rev D" sticker?

Mine was shipped with the 3640 as factory default and was a very early A4000 batch as it have a "Sept 92" ink stamped on internal side of the case lid and a Liteon PSU (later batches had the Skynet type) and a soldered Super Buster 9.

So I guess that other minor fixes are involved and there are some other variants of the same Rev.B

 

[Buzzfuzz]

As far as I know the sticker has Rev B,C,D,E and F.

The 4000D next to me is a Revision B with also Rev B sticker.
However it has Buster 11 socketed, but as far as I know, that means originally it was Buster 9 with a 3630 card and without FPU.

However as Commodore was never straight in it's use for revisions as well as color-coding for wires, I'm not sure of it.

 

[lostrego]

I googled a bit about this issue, and thanks to Google translator , found that Tahoe talks on www.amigascene.nl about a board revision marked as Rev.2 with sub version sticker "Rev.C" I bet that this could be the rare one.

Looking at the pics of the Rev.2 it seems pretty much the same identical board than a Rev.B, maybe (and that's only a guess) Commodore switched the designation from Rev.2 to Rev.B at some point, as the early pre-production prototype (AKA A3400) was the Rev.1 one.

So may the Rev.2 and the Rev.B be the same boards?...

But I've found no trace about that mighty Rev.C board, but who knows...

 

[Misser]

Anyway guys rev b/c/d or whatever. I've sold my rev C A4000D to qq1975b he'll probably post some pictures after cap replacements.

 

[Buzzfuzz]

Yeah it's this http://www.amigascene.nl/modules/newbb/viewtopic.php?viewmode=flat&topic_id=1617&forum=7 topic, where I raise the same question.

Indeed Tahoe says sub fix, but the stickers say 4000 card.

 

[protek]

I've got one of those Rev. 2 boards. It resembles the Rev. B boards with barrel type battery and Chip RAM in slot.

 

[AndyLandy]

This is my Rev 2. board with a Rev C. sticker. It's much the same as the common Rev B. board.

 

[protek]

This is my Rev 2. board with a Rev C. sticker. It's much the same as the common Rev B. board.

Mine's pretty much the same. The Buster isn't socketed on mine and I've had the battery replaced with a Lithium battery holder and diode.

Was your Buster socketed originally or have you put it in socket during Buster upgrade?

 

[AndyLandy]

This is my Rev 2. board with a Rev C. sticker. It's much the same as the common Rev B. board.

Mine's pretty much the same. The Buster isn't socketed on mine and I've had the battery replaced with a Lithium battery holder and diode.

Was your Buster socketed originally or have you put it in socket during Buster upgrade?

Yes, I sent the board to Anthony Hoffman in NZ, and he socketed the Buster and replaced the battery with a new NiMH one, amongst other repairs.

 

[hooverphonique]

so mine is a rev.B mobo with a rev. G sticker on it.. ever seen that before?
also, buster is rev. 9 and not socketed.. seems this is the usual commodore mix-and-match routine ;-)

 

[Buzzfuzz]

so mine is a rev.B mobo with a rev. G sticker on it.. ever seen that before?
also, buster is rev. 9 and not socketed.. seems this is the usual commodore mix-and-match routine ;-)

Yep, this really shows how Commodore does things, and here I thought it was B to F, and now you show us a Rev G :-D

 

[qq1975b]

So,...anyone has a real Rev.C motherboard?
It makes sense that if there is a Rev.D, there is a real Rev.C too.

Can anyone post a picture of it, please?

 

[AndyLandy]

It makes sense that if there is a Rev.D, there is a real Rev.C too.

I'm sorry?

Remember, this is Commodore we're talking about here! There's no reason whatsoever to assume there was a Rev.C!