Gemini Spacecraft

Organization Description

Gemini Pedistle 

Navigation vents

Pre-Launch Routine Mode 

Pre-Launch Routine Mode

Provides the instructions required to check out the computer prior to launch and to read in special data for future use. This routine performs sum-checks on all sectors within the computer memory. These checks are performed by adding the contents of all memory addresses within a sector and comparing the sum with a pre-stored constant. If the constant and the sum are not equal, the computer malfunction latch is set by program instruction PR034. If the sum check is successful, special data is stored in predetermined memory addresses by the common subroutines. These subroutines are discussed in later paragraphs.