Editing Viking program (section)

==Control systems==
The Viking landers used a Guidance, Control and Sequencing Computer (GCSC) consisting of two [[Honeywell]] HDC 402 24-bit computers with 18K of [[Plated wire memory|plated-wire memory]], while the Viking orbiters used a Command Computer Subsystem (CCS) using two custom-designed 18-bit serial processors.<ref name="nasa-computers">{{Cite tech report |last=Tomayko |first=James |url=https://history.nasa.gov/computers/Ch5-6.html |title=Computers in Spaceflight: The NASA Experience |date=March 1988 |publisher=[[NASA]] |id=CR-182505 |access-date=February 6, 2010 |archive-url=https://web.archive.org/web/20230506223908/https://history.nasa.gov/computers/Ch5-6.html |archive-date=May 6, 2023 |url-status=live }}</ref><ref>{{Cite web|last=Holmberg|first=Neil A.|author2=Robert P. Faust |author3=H. Milton Holt |url=https://ntrs.nasa.gov/api/citations/19810001592/downloads/19810001592.pdf| access-date=February 6, 2010|title=NASA Reference Publication 1027: Viking '75 spacecraft design and test summary. Volume 1 – Lander design|publisher=NASA|date=November 1980}}</ref><ref>{{Cite web|last=Holmberg|first=Neil A.|author2=Robert P. Faust |author3=H. Milton Holt |url=https://ntrs.nasa.gov/api/citations/19810001593/downloads/19810001593.pdf|access-date=February 6, 2010|title=NASA Reference Publication 1027: Viking '75 spacecraft design and test summary. Volume 2 – Orbiter design|publisher=NASA|date=November 1980}}</ref>