Most content was generated by Semaphore employees. The only by-lined articles to appear were submitted by readers, in issues 20 to 27, and as a two-part article in issues 4 and 5. Recurring features included products reviews, letters to the editor, reports of what subscribers used their computers for, hints submitted by users, lists of users groups, and lists of Lisa and Macintosh software, hardware, and publications sent to Semaphore for review.
The initial issues were 7" x 9" to fit the documentation binders that arrived with a Lisa. Issues were free with submittal of a Lisa serial number, otherwise $1 per issue in the United States and $2 per issue elsewhere. The name changed with issue 8 to avoid confusion with another existing publication titled Signal). Layout was initially done with LisaDraw and mastered on the Lisa dot matrix printer. Output was sent to digital Compugraphic typesetters beginning with issue 13. Layout of later issues was done with PageMaker.
|Signal||1||06/17/1983||Unknown||4||7 x 9||Bond||No||Reprints were typeset.|
|2||07/25/1983||Reprints were typeset.|
|6||11/16/1983||Reprints were typeset.|
|8||01/05/1984||Reprints were typeset.|
|9||02/10/1984||8||Macintosh coverage begins.|
|12||05/21/1984||First halftone ad.|
|13||06/22/1984||8.5 x 11||Yes||First spot-color ad.|
|15||08/23/1984||First 4-color ad.|
|21||02/16/1985||7,118||"Lisa" dropped from cover.|
|25||01/09/1986||30,183||11.5 x 14||Newsprint||No|
A special edition 11.5" x 17" 32-page black and white newsprint tabloid sold at Macworld dated January 1986 reprinted the non-advertising content of issues 1 to 24.