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Boosted by jsonstein@masto.deoan.org ("Jeff Sonstein"):
DosFox@tech.lgbt wrote:

I think I just found a 40 year old Easter egg.

I was looking into the Levco Monster Mac, which is an upgrade board for the original Macintosh 128k/512k which adds up to 2mb of ram as well as SCSI.

An interesting feature is that this upgrade doesn't necessarily require Macintosh plus ROMs to work (most expansion cards do, as the original ROMs only work with 512k of ram, and don't have SCSI support).

Fortunately the ROMs for the Levco Monster Mac have been dumped.
https://archive.org/details/levco-monstermac-2mxs-rev-d-proms%5F202505

I reassembled the ROM from the high and low ROM dumps, looked at the resulting binary with a hex editor and there's a nice little greeting for people poking around the ROM 😂

A small screenshot of a hex editor. To the left is the actual hex (good ol' 68000 binary) and to the left is the ASCII representation. In the ascii you can read the message "Hi guys!"