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DOS doors With DosBox
This guide is aimed at Raspbian Linux (Stretch) on Raspberry PI, but should work on any Linux/UNIX like system DosBox supports.
Step 1. Install Pre-Requisites
To compile DosBox, you will need SDL 1.2 and SDL-net in addition to the usual development toolchain. You will also need Subversion to get dosbox and patch to patch it.
sudo apt-get install build-essential libsdl1.2-dev libsdl-net1.2-dev subversion automake
Step 2. Fetch DosBox
The most recent DosBox release has some issues with DOS doors, and the most recent Subversion code also has issues, so you will need a specific revision from the subversion repository. In my tests I have found r3933 to work well. Other revisions may work, but have not been tested.
svn checkout -r3933 svn://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk dosbox-code-0
Step 3. Patch DosBox
Now we have the DosBox code, you will probably want to patch it to fix a specific bug that happens with some doors which will appear as though when you press enter, it receives the enter command twice.
wget https://gist.githubusercontent.com/apamment/bb438d9be6dc8e67c36239fd64047ece/raw/3e942c68d7a970f3404bffc2408165d810c4bef7/dosbox-nullmodem.diff cd dosbox-code-0 patch -p1 < ../dosbox-nullmodem.diff
Step 4. Compile DosBox
Compiling DosBox takes a long time on the Raspberry PI and will appear to have frozen a few times - particularly when compiling the render-scalers file - don't worry, just leave it it will eventually move on.
./autogen.sh ./configure make sudo make install
These commands will compile and install DosBox into /usr/local/bin.
Step 5. Create Configuration File
Step 6. Create Shell Script to Invoke DosBox
Step 7. Create Batch File to Start Door
Step 8. Setup BBS to call Shell Script
