Smoke Signal Broadcasting DOS-68 Disk Operating System

The following is from their March '79 Computer Product Catalog:
DOS-68, a powerful disk operating system, is conveniently loaded into 4K of memory at $7000 (optionally at $D000) by a boot routine resident in PROM on the controller board. DOS-68 gives the user the ability to easily create or modify the operating system commands to suit specific needs. The versatility allows for newly developed software to be installed on the user's system.

DOS-68 is supplied with the following commands:

      NAME         FUNCTION

     LIST          List the disk directory
     SAVE          Save memory into a file
     GET*          Load a binary object file into memory
     GETH          Load a hex formatted object file
     RUN*          Load a file into memory and begin execution
     DELETE        Remove a file from a disk
     RENAME        Change the name of a file
     APPEND        Merges two files together to form one file
     PRINT         Print the contents of a file
     COPY          Allows files to be copies from disk to disk
     SDC           Single disk drive copy
     LINK          Set up information to boot the monitor
     INSTAL        Convert object file to a command file
     FIND          Type load address information
     VIEW          Type contents of an editor text file
     CLOSE*        Close all open files
     EXIT*         Exit to other resident monitor
     ASYS          Assign system disk
     FORMAT        Format a blank disk

         (*indicates a memory resident command)
DOS-68 allows access to the disk file management subsystem thereby making it easy for the programmer using assembly language to perform operations on disk files. Routines are available for such functions as: creating or deleting sequential or random files, reading or writing to files, renaming files, appending files, and reading the disk directory. Through the use of the file management system, the user can easily access as many or as few files as desired at any time.

(remove all "x"s to get a valid address)