I recently came across this EBAY Auction of a pre-production 128k logic board from 1983. In the photos you can see the CPU marked "SC87839L."
I wrote to Freescale about the chip and they replied as follows:
Unfortunately, the part number you have referenced was not a standard Freescale/Motorola Semiconductors device (see the "SC" prefix). It was a proprietary device manufactured by Freescale Semiconductors for a specific company to their own specification. The proprietary devices (also documentation) become confidential and can only be obtained through the company for whom we manufactured the products.
These devices cannot be crossed referenced.
If this device was found in an end product, please contact the manufacturer of the product or equipment for information. Due to nondisclosure agreements with this company, we are not authorized to release information. We can only release data on standard products. Please accept our apology for any inconvenience this may cause.
Have a nice day and thank you for contacting the Freescale Semiconductor
- Customer Care Center.
Of course, this reply simply means I would need to contact Apple about the chip. But certainly they would not be forthcoming with details. This is obviously a custom variant of the 68000 chip, but what kind of variant? Anyone know an Apple engineer who worked on the logic boards back in '83?