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/rcscript 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.