In fact, I'm surprised more eBay Lisa sellers haven't shown a picture of these lines of code alongside the serial number sticker, to show that the parts are original.You might want the model name or serial number of your Mac when checking warranty coverage, searching for specifications or other information about your model, creating a home inventory, and more. It's certainly useful when trying to tell if your Lisa has its original CPU board/Video ROM. I know it's not new information, but it's useful to know and have on hand. Nibbles 3 thru 7 are the AppleNet number (NNNNN). Nibbles 0, 1 and 2 are the AppleNet prefix (PPP).Ĭ. Ignore nibbles 8 through F, marked as XXXXXXXX above.ī. Number of the Nibble in Hex 012 34567 89ABCDEFĪ. The Applenet Number is similarly embedded in the first 8 bytes of the next Nibbles 9 thru C are the 4 digit serial number (SSSS). Nibbles 6, 7 and 8 are the day of the year code (DDD).Į. Nibbles 4 and 5 are the two digit year code (YY).ĭ. Nibbles 2 and 3 are the two digit plant code (PP).Ĭ. Ignore nibbles 0,1,D,E and F, marked as XX or X above.ī. Number of the Nibble in Hex 01 23 45 678 9ABC D EFĮxtract the serial number from this group of 16 nibbles as follows:Ī. You will then receive two lines of code.įirst remove every other nibble like this:Ġ0000240 0F0F 0002 0802 0002 0000 0400 0300 0F0F When prompted for 'Address?', type 240, and click enter. Then type Apple-S and you'll get to service mode. Then, try to boot up from a blank floppy drive, the Lisa will respond with an error. When the memory is being tested, press the shift key. Here's how to retrieve the serial number encoded into a Lisa's Video ROM: Apparently, this information is coded into the Video State Machine ROM located at C6 on the CPU board.

The issue at hand was how the Lisa 'knew' its own serial number.

I found it pretty interesting, so I'm posting it here for any other Lisa collectors: After reading over some Lisa technical docs, I finally came up with the answer to a Lisa question I had a while back.

Apple serial number info