Joshua Bell 4bdb0808a2 Add HIDE / UNHIDE commands, to toggle the access "invisible" bit
This is used by the GS/OS Finder to conceal FINDER.DATA files.
Documented in "Exploring GS/OS and ProDOS 8" by Gary B. Little.
BASIC.SYSTEM's CAT/CATALOG are unaware of this, so the files are still

Note that the command is named "UNHIDE" rather than "SHOW" as that
sounds like a command to display file contents or something.
2023-05-11 09:37:00 -06:00

3.6 KiB

CMD executable PATH for ProDOS's BASIC.SYSTEM


💾 Disk images can be found on the Releases page 💾

Build with ca65

Instructions For Users


  • Copy files from the floppy disk image to your Apple's hard disk, in a subdirectory e.g. /HD/CMD
  • From BASIC.SYSTEM prompt, run: PATH, e.g. -/HD/CMD/PATH, either from STARTUP or manually

After installation, the usage is:

PATH prefix     - set search path(s) - colon delimited
PATH            - view current search path(s)
cmdname         - load and execute named CMD, if in PATH
  • Once set, binary files of type CMD in the specified directories can be invoked by name.
  • Supports multi-segment, colon-separated paths, e.g. /hd/cmds:/hd2/more.cmds


] -/hd/cmd/path          - install it
] PATH /hd/cmd:/h2/bin  - set PATH
] PATH                   - verify path
] BELL                   - will invoke /hd/cmd/BELL if present
] HELLO                  - will invoke /hd/cmd/HELLO if present
] ONLINE                 - will invoke /hd/cmd/ONLINE if present


  • PATH can be invoked as lower case (e.g. path /hd/cmd)
  • Commands can be invoked as lower case (e.g. hello)

Sample commands included:

  • HELLO - shows a short message, for testing purposes
  • ECHO - echoes back anything following the command
  • CD - like PREFIX but accepts .., e.g. cd ../dir
  • ONLINE - lists online volumes (volume name, slot and drive)
  • MEM - show memory stats for the BASIC environment
  • COPY - copy a single file, e.g. copy /path/to/file,dstfile
  • TYPE - show file contents (TXT, BAS, or BIN/other), e.g. type filename
  • TOUCH - apply current ProDOS date/time to a file's modification time, e.g. touch filename
  • DATE - prints the current ProDOS date and time
  • CHTYPE - change the type/auxtype of a file, e.g. chtype file,T$F1,A$1234
    • T (type) and A (auxtype) are optional. If neither is specified, current types are shown.
    • S and D arguments can be used to specify slot and drive.
  • CHTIME - change the modification date/time of a file, e.g. chtime file,A$1234,B$5678
    • A (date) and B (time) are optional. If neither is specified, current values are shown.
    • S and D arguments can be used to specify slot and drive.
  • BELL - emits the standard Apple II beep
  • BUZZ - emits the ProDOS "nice little tone"
  • HIDE / UNHIDE - sets / clears the "invisible" bit on a file, used in GS/OS Finder

Instructions For Developers

Behavior of PATH:

  • Search order when a command is typed:
    • ProDOS BASIC.SYSTEM intrinsics (CAT, PREFIX, etc)
    • BASIC keywords (LIST, PRINT, etc)
    • CMD files in paths, in listed order
  • Allocates a permanent buffer to store the code and path (2 pages)
  • Applesoft BASIC commands are unaffected (but can't be CMD names)
    • Commands with BASIC keywords as prefixes are allowed as long as the command continues with an alphabetic character. For example, ONLINE is allowed despite conflicting with the valid BASIC statement ONLINE GOTO10 which is short for ON LINE GOTO 10.

Protocol for CMD files:

  • CMD file is loaded at $4000 and invoked; should return (rts) on completion.
  • $4000-$5FFF is assumed reserved for the CMD file and any buffers it needs.
  • The command line will be present at $200 (GETLN input buffer).
  • Commands can use the BI parser for arguments. See chtype.cmd.s for an example.