Editing Apollo Guidance Computer (section)

===Memory===
The computer had 2,048 words of erasable [[magnetic-core memory]] and 36,864 words of [[read-only memory|read-only]] [[core rope memory]].<ref name="HALL-MITRole">{{cite book |last1=Hall |first1=Eldon C. |title=MIT's Role in Project Apollo: Final report on contracts NAS 9-163 and NAS 94065 |date=1972 |publisher=MIT |location=Cambridge, MA |url=http://ibiblio.org/apollo/hrst/archive/1029.pdf |access-date=15 June 2021}}</ref>{{rp|27,90–93}} Both had cycle times of 11.72&nbsp;microseconds.<ref name="HALL-MITRole" />{{rp|27}} The memory word length was 16 bits: 15 bits of data and one odd-[[parity bit]]. The [[central processing unit|CPU]]-internal [[16-bit]] word format was 14 bits of data, one [[arithmetic overflow|overflow]] bit, and one [[sign bit]] ([[ones' complement]] representation).<ref name="HALL-MITRole" />{{rp|35–37}}