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Old 30 November 2011, 05:57   #1
platatomi
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A500 Rev 4

Cannot find any info what so ever about this revision. Heres a few pics.

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ID:	29975

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Views:	508
Size:	46.0 KB
ID:	29973

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Name:	DSC_1892.JPG
Views:	546
Size:	49.8 KB
ID:	29974
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Old 30 November 2011, 06:45   #2
platatomi
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More pics

please if you know anything about this revision let me know.
Attached Thumbnails
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Name:	DSC_1890.JPG
Views:	402
Size:	47.7 KB
ID:	29976   Click image for larger version

Name:	DSC_1897.JPG
Views:	313
Size:	40.0 KB
ID:	29977   Click image for larger version

Name:	DSC_1895.JPG
Views:	383
Size:	46.8 KB
ID:	29978  
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Old 10 December 2011, 14:30   #3
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I always wondered if there was a Rev.4 board..... like you say, there is next to no information.

Comparing it with Rev.3.... looks like a few changes have taken place on the board itself (Rev.3 was notoriously buggy) - the ceramic chips you have on there are quite rare before they were replaced for the cheaper non-ceramic counterparts.

So most likely a 'fixed' board to replace Rev.3. I would imagine Rev.4 wasn't around for long.
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Old 26 January 2012, 15:04   #4
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What version is the kickstart (I cant quite make it out from the pic)
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Old 25 July 2017, 06:48   #5
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KS is 34.5. Seems someone swapped it out later on.


Has anything new turned up about the Rev. 4 in the last six years, or have any more of them been found?

As far as I can tell, only one other Rev. 4 board besides mine is known to exist.



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Old 25 July 2017, 08:54   #6
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It seems that not many of these ever made it out. :-)
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Old 25 July 2017, 09:42   #7
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Does the serial number mean anything? CA1000049

I haven't had any luck figuring out the encoding scheme they used. Should it be read as 49 or 1,000,049? The back half of the case may not be original too.
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Old 26 July 2017, 09:51   #8
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March 1987... wow! Maybe it was US only, hence so little have ever surfaced?
Was definitely a KS 1.2 by origin.
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Old 26 July 2017, 18:52   #9
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The "W.C. BUILD" label probably means it was built at Commodore in Westchester, PA. Maybe 1076 is the "real" serial number in a sense.

I wonder if the custom chips are the original ones. They're ceramic packages which I'm surprised to see in an A500. Can you upload some higher-res pics of the board?
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Old 27 July 2017, 01:31   #10
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This one has nice detail. It really expands if you right-click and hit 'view image' once you load the full-resolution version.

As far as I can tell, every chip is dated 1986 or earlier, except for the KS which is dated 1989.

Did the A500 ever come with ceramic chips?


image upload
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Old 27 July 2017, 01:57   #11
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Seems to have chip production dates between '86 and '87. They are likely leftover Denise and 8520 ceramic chips from the A1000 production bin. Agnus is 512K made May '87. Gary is the Toshiba-made variant before MOS started producing it. Sharp made the KS1.2 ROM. note the old style ferrite beads and the heavy resistor package along the rear
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Old 12 October 2017, 12:31   #12
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That expansion. Did you open it and removed battery? And if you need clock put button battery with adapter.
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