This is my personal copy of LSI-UNIX that I have been working on recently. It contains a few modifications from the original source, but is also faithful to it. The kernel is 10KW in size, and adds back a number of features from UNIX v6. The current system setup can compile its kernel and all user programs locally.

This version of LSX has been modified to support the following:

• Full use of system memory
• Multiple block device drivers
• Booting from the RX02 and RK05
• The mount and umount commands
• TTY raw mode for screen editor use
• Proper inode allocation for large file systems
• Execution of /etc/rc script on startup
• Swap partition on the root disk
• Dynamic use of swap space depending on program size
• Various utilities like cat, dd, etc..

The included system images for the RK05 and RX02 are both built to run on a PDP-11/03 with 56Kb of RAM and no EIS. Having a CPU with EIS will make things run faster, however.

In the future, I plan to support the following:

• A fix for the mysterious "backspace" bug
• MSCP boot and driver
• Floppy drive optimizations
• Improved shell

Also included in the distribution is the eds editor. This is a VT100 screen editor that I wrote off of the bones of the original ed editor. It works a little like an extremely cut down version of nano. The commands are:

• CTRL+Q: Exit the editor
• CTRL+W: Write to the current file
• CTRL+R: Redraw the screen
• CRTL+G: Goto line (type number of line and hit enter)
• CTRL+A: Goto beginning of line
• CTRL+Z: Goto end of line

Modifying the editor to work with a VT52 or ADM-3A shouldn't be too difficult.