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Impossible Mission II for the Apple II has a lot of IIs in its name, which very nearly got this article created with the wrong title.

Developer Message#

By sector-editing the following bytes:

T00,S0E,$4A (byte $E4A in a typical .dsk file) from $13 to $18
T00,S0F,$37 (byte $F37 in a typical .dsk file) from $15 to $1A

A secret message from the developer will be displayed in place of the title screen:

Impossible_Mission_II_(Apple_II)-secret_title.png

The Apple II was still seeing regular release in 1988 (and would continue production up to 1993, when the final standalone Apple IIe Platinum was discontinued), but was dreadfully showing its age even by then, having been in production of some sort for over a decade.

(Source: @a2_qkumba, via @a2_4am)