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Catalina release 4.2 is a full release. You can install this over an existing version of Catalina, but it is recommended that you instead uninstall any previous Catalina release before installing, or install this release to a different location. If you are installing under Linux, you should execute the following command to set your permissions correctly after installing (this command is a script in the Catalina bin directory, and may itself need to have its permissions manually set to allow execution): Set_Linux_Permissions The following changes have been made since the previous release of Catalina. If you have not used a previous release of Catalina, you can ignore the following list: RELEASE 4.2 1. Added the Catalina Geany IDE. For details see the document "Getting Started with the Catalina Geany IDE". This new IDE was released as an addition to the Catalina 4.1 relase, but will now remain part of all future releases. 2. Added a new HMI plugin for the P2, which supports a VGA monitor with configurable resolution and colour depths, and also a USB keyboard and mouse. It expects to use the P2-ES A/V and Host Serial accessory boards. The VGA driver supports 640x480, 800x600 and 1024x768 resolution, and 1 bit (i.e. monochrome), 4 bit, 8 bit or 24 bit colour. Updated test programs for the new HMI plugin (test_terminal.c, test_vga.c) are included in the demo folder, and a precompiled version of Catalyst that uses the new HMI plugin is included in the file P2_EVAL_VGA.ZIP in the main catalina folder. Unzip these files to an SD card and insert it into the P2_EVAL board with the A/V (VGA) accessory board on the header with base pin 32, and the Host Serial (USB) accessory board on the header with base pin 40. A keyboard should be plugged into USB port A (i.e. the lower USB port, nearest the circuit board - none of the Catalyst programs use a mouse, so it is not compiled with a USB driver for port B ). Note that the only program that makes use of color is the vi text editor. 3. Increased the size of the P2ASM symbol table to 10000 symbols - otherwise compiling Lua with the new VGA plugin could run out of symbol space. 4. Fixed an error in the Catalina Geany IDE shortcut, which assumed Catalina was installed in the default location. The shortcut and menu item would fail to work if it was not. 5. The build_all.bat script for building Catalyst under Windows was defining the symbol VT100, which would have made some programs - such as vi - not work correctly with the VGA or TV HMI options (it worked correctly with serial HMI options, and now should be manually specified if the PC or TTY HMI options are used). 6. The Catalyst version of vi (xvi) now uses colours (if compiled with a HMI option that supports it).