Re: ROM 00 to ROM 01 upgrade

[a_specto@alcor.concordia.ca (Mitchell Spector)]

a_specto@alcor.concordia.ca (Mitchell Spector) wrote:

Just a follow up on my post from a week ago...

>    Off hand I don't know the serial number range for the ROM 3, and all IIgs
>cases had the same model number regardless of which motherboard was in
>the case (A2S6000). My ROM 3, from early 1990, starts with this number if it
>helps: "013xxxxx". The IIgs I bought in late 1987 started with "815xxxx". 

    I just pulled another one of my ROM 3's from the closet (which passed
through a few owners before it got to me) and its serial number starts with 
"903xxxx" and ends with "xxxxA26000C". That differs from the ROM 3 
("013xxxx") I mention above, which ends with "xxxxA0012C/A".

    Another interesting thing is when comparing serial numbers between all
my IIgs's, I noticed some have different 825-xxxx-x part numbers listed on
the underside. There's 825-1267-A, 825-1267-B and 825-1444-B. I'm not
sure what these indicate, perhaps the location they were manufactured?

>    The best way to tell is opening the case and looking inside. I can
>instantly spot a ROM 00, 01 or 3 motherboard, even glancing at a 
>fuzzy photo image.
>
>ROM 00 motherboard: 
>
>- White sticker on ROM chip
>- ROM part number suffix is "-A" , and "86" is last copyrighted year

    Apparently there were _some_ ROM 00 chips produced without
stickers, just a plain silk-screened part number (or perhaps if you
remove the sticker there's a part number underneath?).

    This is just more useless trivia I suppose, most people will have
the opportunity to turn on the machine or just simply open the lid. :)
(and again, all the markings are meaningless if the board was
ever swapped).

Mitchell Spector
a_specto@alcor.concordia.ca