Fast Assembler type in assembler from COMPUTE!'s Gazette Magazine as discussed in the YouTube Video:
Learn C64 Assembly Language using the Fast Assembler type-in program from COMPUTE!'s GAZETTE 1986
Fast Assembler.d64
All files that were shown in the video.
Compute_Gazette_Issue_31_1986_Jan.pdf
PDF Copy of the Magazine. This contains the full documentation for the Fast Assembler.