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Thread: Early 1977 Integer ROM's

  1. #11
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    And here's one at serial 2333:

    https://www.flickr.com/photos/lars-s...57659882852928

    All 1978 except for one likely replacement 1979 chip.

    Interesting.

  2. #12
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    I have a feeling I should know the answer, but are the serial numbers even chronologische sequential?

  3. #13
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    I believe so. Lines up with what I have in my database. The Rev 0 boards are always just a couple hundred serials above the cases.

  4. #14
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    One thing I have always been intrigued by on the serial number front.. is why Apple stopped at close to 40000 and then resumed at 60000. I've never seen a 40000 to 60000 machine.

  5. #15
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    As a guess I'd say that either they reserved those numbers for machines they expected to produce and didn't (or did produce and disposed of) (Apple ///?). Or, they changed their method of tracking serial numbers and didn't want to get confused.

  6. #16
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    Quote Originally Posted by falter View Post
    One thing I have always been intrigued by on the serial number front.. is why Apple stopped at close to 40000 and then resumed at 60000. I've never seen a 40000 to 60000 machine.
    When the Apple II plus was released did they continue the serial numbers sequentially or start over?

  7. #17
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    Quote Originally Posted by VERAULT View Post
    When the Apple II plus was released did they continue the serial numbers sequentially or start over?
    Based on my records, I want to say A2S2 (Apple II+) production began around the 30000 mark for the A2S1 (Apple II). That's based on motherboard dates that seem to be midway through 1979, that I've seen in both late production A2S1s and very early production A2S2s.

    As far as I can tell, A2S1 production serial numbers continued sequentially throughout A2S2 production, with that gap between 40000 and 60000 excepted. The last number I have before 40000 is 39951 - its motherboard date code was 8005. It appears there was some kind of a pause, and then my numbers pick up again in the 61000s into 70000s. The highest SN for A2S1 that I've recorded is 78139, date code 8051.

    If I had to make a drunken bet, based on the gap in motherboard date codes for A2S1s 39951 (last before 40000) and 61407 (first in the 60000s I have on record), Apple maybe intended the A2S2 to supplant the A2S1 entirely, and then for some reason (maybe user protest) backed off. They then resumed production with a new range of serial numbers, perhaps for some internal reason (as KC9DUX suggested) to distinguish them from the original run. I'd also wager that A2S1 production ceased completely the last week of 1980.
    Last edited by falter; July 10th, 2018 at 09:34 AM.

  8. #18
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    Note the serial number on this one Serial no is shown on photo 7.

    Maybe 40000 to 60000 was reserved for variants?

    PJH

  9. #19
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    Quote Originally Posted by pjhacnau View Post
    Note the serial number on this one Serial no is shown on photo 7.

    Maybe 40000 to 60000 was reserved for variants?

    PJH
    That's A2S2. The gap is in A2S1 serials.

  10. #20
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    Quote Originally Posted by rittwage View Post
    That's A2S2. The gap is in A2S1 serials.
    My bad; sorry.

    PJH

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