Source: Chris'n'Vickie of Chicago
The weirdest thing I found in my HP 150 is that the phrase "My mind is going..." is burned in one of the ROMs. I have no idea why it's there or if it would ever appear on the screen. My pet theory is that it's a diagnostic that appears if some of the ROMs are missing (a la the HAL dismantling scene in 2001).
More likely someone noticed there were a few unused bytes at the end of the ROM and slid that in as a joke. There is the well know story of the "resist
the draft" message that's stored in some user inaccesable (usually) part of someone's LOGO and one or more of the VAX chips has "VAX, for those who care enough to steal the best" in Russian on an unused part of the mask....
In all cases the companies involved claimed no knowledge of these when discovered.
Source: Mik Butler
If I remember correctly there was an easter egg in the 150 that would cause it to respond to XYZZY in the right circumstances.
The 'My mind is going' may well have been the response.
Rodney Brown, Co-Cam Computer Group, ACSNet
To get an HP150 (or HP2625/HP2628 terminal) to produce the "my mind is going..." message, send or type the sequence &a?