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http://www.xedox.de/simelf/emu.html Cosmac ELF Emulator
Links:
http://www.cosmacelf.com/
http://www.elf-emulation.com/
http://www.sparetimegizmos.com/Hardware/Elf2K.htm
https://billr.incolor.com/computer_simulators.htm
http://www.decodesystems.com/cosmac/index.html
http://humanoidolabs.blogspot.com/2012/03/propeller-elf-ii.html
More Programming. The single-line output program shown below is a simple program that will flash the Q LED at a preset rate. It also provides a programmable square wave on the Q line.
Step M Bytes Comment
1 0000 7A 0-->Q
2 0001 F8 10 B1 10-->R1.1
3 0004 21 R1.1
4 0005 91 R1.1-->D
5 0006 3A 04 Repeat step 3 if D = 00
6 0008 31 00 Go to step 1 if Q = 1
7 000A 7B 1-->Q
8 000B 30 01 Go to step 2
7A__0111__1010
F8__1111__1000
10__0001__0000
B1__1011__0001
21__0010__0001
91__1001__0001
3A__0011__1010
04__0000__0100
31__0011__0001
00__0000__0000
7B__0111__1011
30__0011__0000
01__0000__0001
When you run this program, the square-wave frequently depends on the settings of the input switches. You can change frequency at any time. For higher frequencies, change B1 at M(0006) to A1 and 91 at M(0008) to 81. You can now select any of 256 different frequencies by altering the settings of the switches.