OS-9 (also OS-9000) Easter Egg - Creator Credits in Serial Devices (Shell)

The OS-9 operating system has a file manager called "SCF" which handles serial devices such as the console. One of the system calls available will "stuff" the input buffer with a string which can later be recalled by using the CTRL-A ("again") keyboard sequence.

Microware programmers hid a credit string inside this buffer which you can obtain by typing "CTRL-A" on a serial prompt that has never been used (unless the program clears it).

The easiest way to see this on most OS-9 systems is by pressing "CTRL-A" at the LOGIN prompt. On some versions, pressing CTRL-A at the OS-9 shell prompt when you first boot up will also produce it.