Please make sure you have the latest version of the JRE installed. You can use
java -version on the command line to see. Make sure it’s 1.9 or 1.10.
You can install the JRE from this link.
I have made changes to both programs to improve usability and fix annoying bugs. Please download and use my versions instead of the ones listed on their respective websites.
MARS - This is the MIPS simulator we’ll be using for the first half of the course.
Logisim - This is the circuit simulator we’ll be using for the second half.
If you run into problems with these programs, PLEASE let me know!
Changes to MARS
- Adds the “Keypad and LED Display Simulator” tool which you will be using for your project (and some of the labs)
- Allows you to write registers without the dollar signs
- Looks much more reasonable
- Fixes display order of ASCII strings in memory view
- Added “Clear Run IO on Assemble” setting
- Other tiny UI improvements
- Removes several la pseudo-ops which confused everyone
- Added push/pop pseudo-ops so macros are no longer needed
- Makes it possible to write destination on the left in stores
- Assembler gives an error if it finds instructions in the data segment - no more forgetting .text
- Added binary number literals, like 0b100101
- Sets the default settings to something more reasonable
- If you have “Initialize PC to global main” enabled, but don’t have a global main, it will now give an error
- Fixed bug where single-stepping would cause execution to really slow down
Changes to Logisim
- Tunnels will appear “ghosted” if they have no partners (unconnected to anything)
- Tunnels can now be color-coded
- No more asynchronous 0 clear on registers
- Plexers now default to NOT having an enable input
- Gates now default to narrow with 2 inputs
- On mac, program now exits when closing last window
- Fixed a bug when changing tunnel names that would make the circuit stop responding