However , on May 1 , 1964 at 4 a.m.
Work on the compiler and the operating system was done concurrently , and so the first BASIC programs were run in batch mode as part of the development process during early 1964 .
On May 1 , 1964 at 4 a.m.
Work on the compiler and the operating system was done concurrently , and so the first BASIC programs were run in batch mode as part of the development process during early 1964 .