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READ_ME.1ST
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1987-10-12
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Special Information for DoubleDOS users
=======================================
Programmer's Information for DoubleDOS
--------------------------------------
The file SWITCH.ASM on your DoubleDOS disk contains the source
code (assembler) for the DoubleDOS utility program SWITCH.EXE. In the
"comments" found in this source code are explanations of the software
"calls" your program can issue to DoubleDOS.
As you will see, your program can control many of the aspects
of the multi-tasking system. You can use the INVISIBLE program as
a resource of the VISIBLE program by causing your (VISIBLE) program
to send the appropriate keystrokes to the INVISIBLE program and
control its operation completely.
These calls can be used directly as shown for assembly
programming. From "C" or Turbo Pascal (etc.) you can form the
"DOS calls" using the appropriate syntax. If you are programming
in BASIC, the file DDSWITCH.BAS (in the PATCHES subdirectory of
the DoubleDOS disk contains the appropriate coding for many of
the function calls which you can use from within your program.
DOS Function Keys Enhancements
------------------------------
The latest DoubleDOS software contains an undocumented
capability which substantially enhances the use of the DOS
function keys (F1-F6). If you use the DOS function keys now,
you will really appreciate the new features. These new features
work in conjunction with the DOS buffer defined for "buffered
keyboard input". You can use them from the DOS prompt, EDLIN, or
any application program using that function. In summary, they are:
F7 - Plays back the most recently used command. It is
like using F3 under DOS, except for the next to
the last keyboard command.
F8 - Plays back the oldest command in the buffer. Same
as F7 above, except working from the other end of
the type-ahead buffer.
F9 - Plays back all keyboard buffer contents for visual
review. Each command is separated on the screen by
a vertical bar. This permits you to see what you
have stored up for playback with F7 and F8.
F10- Erase back to the character typed next. This command
is the "compliment" of the F2 key.
Bulletin Board System for DoubleDOS users
-----------------------------------------
The SoftLogic Electronic Bulletin Board System (BBS) is a
service started in the fall of 1985. The system is loaded with good
information and is live 24 hours a day. No passwords are required to
browse through the information or to download information for further
review.
You can use the BBS to "download" a variety of information
made available by the SoftLogic service department. You can also use
the BBS to leave messages for the tech support department.
You can access the BBS at either 300 or 1200 baud, using your
favorite communications program. The number for reaching the BBS is
603-644-5556.