What 6502 macro assembler was used for the AIM-65 Monitor ROM?

Anyone know what 6502 macro assembler was used for the AIM-65 Monitor ROM, as shown in the AIM-65 Monitor Program Listing manual, document number 29650N36L ? Some of it's identifying features are using .BYT and .WOR (or .WORD) directives for declaring data, and .MACRO and .ENDM directives for declaring macros. Use of the macro directives can be seen in the RM65-5101 Floppy Disk Controller (FDC) Module User's Manual, document number 29801N02 There are countless 6502 assemblers available now, the exercise here is to identify the macro assembler that was used at the time. If it is available to run now the goal would be to run it to assemble source code exactly in the format that it used and produce identical listing output. (Modifying the source code to be accepted by a different assembler to produce identical binary output is not the goal of the exercise).