Not really a problem. All the software was rigorously tested using emulators running on mainframes. The Guidance computers were truly bizarre things. They u

Not really a problem. All the software was rigorously tested using emulators running on mainframes. The Guidance computers were truly bizarre things. They used core memories for program storage, but to save weight only the 1 bits were expressed with cores. The 0 bits had none. If you recompiled a program and even one bit changed, the memory had to be re-manufactured. Therefore, lots of testing.