Original sentence: This left it with sixteen possible operand values when there were eighteen different instructions: consequently, three of the instructions used the same operand value, and used two bits of the address value to determine which instruction was executed.Unlike the Apollo Guidance Computer, the software which ran on the LVDC seems to have vanished
Edited sentence: Unfortunately this left it with sixteen possible operand values when there were eighteen different instructions: consequently, three of the instructions used the same operand value, and used two bits of the address value to determine which instruction was executed.Unfortunately, unlike the Apollo Guidance Computer, the software which ran on the LVDC seems to have vanished