Sinclair ZX Spectrum Service Manual 
Spectrum For Everyone  https://spectrumforeveryone.com/ 
58 
Also pressing any one of the following keys also makes contact between row 2 and column 8 on the top 
membrane in addition to their dedicated row/column positions. 
 . (full stop) 
 ; (semi-colon) 
 " (inverted commas) 
 , (comma) 
For example, pressing the full stop key connects row 2/column 8 on the top membrane as well as row 
3/column 8 on the lower membrane. 
10.5 SPECTRUM + KEYBOARD ā TOP MEMBRANE