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LaserWriter IIsc (and maybe others) Easter Egg
Posted by: demik on 2026-03-08 03:07:36
Hello,

While working with LW ROMs, I noticed there is an hidden image in the IIsc ROM. It's not really visible on a classic CLI hex editor but if you mess with sizes it starts to stand out.

It's a RAW black and white MSB first. @Danamania helped to recreate the image faster than I could mess with Copilot and scripts so here it is. Original image is 256px wide. The image starts probably at 0x25bc in the ROM




There is also a string at the end of the ROM which is similar

** (c) Apple Computer, 1987 ** ** Hardware: Mike Flora ** ** Firmware: Tad Browne **

Has anyone seen this image somewhere ? I've not found any codepath in the ROM that point to it so it may not be visible at all. One function point at it but nothing seems to be calling it.

Since this is a QuickDraw printer, it's possible one can see it from MacOS.
Posted by: croissantking on 2026-03-08 05:07:53
Hello,

While working with LW ROMs, I noticed there is an hidden image in the IIsc ROM. It's not really visible on a classic CLI hex editor but if you mess with sizes it starts to stand out.

It's a RAW black and white MSB first. @Danamania helped to recreate the image faster than I could mess with Copilot and scripts so here it is. Original image is 256px wide. The image starts probably at 0x25bc in the ROM




There is also a string at the end of the ROM which is similar

** (c) Apple Computer, 1987 ** ** Hardware: Mike Flora ** ** Firmware: Tad Browne **

Has anyone seen this image somewhere ? I've not found any codepath in the ROM that point to it so it may not be visible at all. One function point at it but nothing seems to be calling it.

Since this is a QuickDraw printer, it's possible one can see it from MacOS.

Is it possible that part of the Easter egg design is that it gets printed?
Posted by: demik on 2026-03-08 06:31:19
Yep that's a possibility as well
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