gdb and simulavr are the backend of AVR studio. With gdb and simulavr you can do the same things you can do with AVR studio. Ubuntu has in its repository some ready packages. Look for gcc-avr, binutils-avr, avr-libc, avrdude, gdb-avr, simulavr. Just install them, that's it Cool The downside is that you don't have a GUI, you probably need to simulate your code from the command line.

michael@ubuntu:/host/Documents and Settings/Michael/My Documents/Downloads/android-sdk-linux_x86-1.5_r2/tools$ ./android create avd -t 2 -n android15
Android 1.5 is a basic Android platform.
Do you wish to create a custom hardware profile [no]
Created AVD 'android15' based on Android 1.5

michael@ubuntu:/host/Documents and Settings/Michael/My Documents/Downloads/android-sdk-linux_x86-1.5_r2/tools$ ./emulator -avd android15

% /home/cs1721/bin/emu /home/cs1721/public_html/05s2/emu/examples/iota.hex
Emu Reference Implementation v0.?
> program
0000: e000 LDI R16,0
0001: e081 LDI R24,1
0002: 2fa0 MOV R26,R16
0003: e7f0 LDI R31,112
0004: e0e0 LDI R30,0
0005: 9509 ICALL
0006: e011 LDI R17,1
0007: 0f01 ADD R16,R17
0008: e614 LDI R17,100
0009: 1b10 SUB R17,R16
000a: f7b1 BRBC 1,-10
000b: e080 LDI R24,0
000c: e7f0 LDI R31,112
000d: e0e0 LDI R30,0
000e: 9509 ICALL
> registers
PC=0000 SP=1100 SR=[C=0,Z=0,N=0,V=0]
r00-r0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
r10-r1f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> step
0000: e000 LDI R16,0
PC=0001 SP=1100 SR=[C=0,Z=0,N=0,V=0]
r00-r0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
r10-r1f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> run
0
1
...
8
9
> restart
> run
0
1
...
9
> registers
PC=000f SP=1100 SR=[C=0,Z=1,N=0,V=0]
r00-r0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
r10-r1f 0a 00 00 00 00 00 00 00 00 00 09 00 00 00 00 70

• This demo is a BASIC program that draws a circle and then a sine funtion.
• Library - There are also game and miscellaneous other programs
• http://tinyurl.com/demozx81
• http://www.vavasour.ca/jeff/ts1000/index.html

An 8080 actually, not a Z80

• Readme file
• Run JSSpeccy online (includes 10 classic games!)
• Download JSSpeccy (644Kb)
• JSSpeccy Subversion repository

	TITLE 'DEMOAST1 - READ AND PRINT'
*
* AUTHOR.  DON HIGGINS.
* DATE.    12/30/82.
* REMARKS. PC/370 DEMO TO ILLUSTRATE ASSIST DUMP AND LOG OUTPUT.
*
* THIS PROGRAM READS CARDS FROM DEMOAST1.DAT AND LISTS THEM ALONG
* WITH SELECTED DUMPS OF REGISTERS AND STORAGE ON DEMOAST1.LOG.
*
* MAINTENANCE
*
* 05/18/87 CONVERTED TO R2.0 XFILI/XFILO PATH/FILENAME FORMAT
*
*
DEMOAST1  CSECT
	USING *,R15
	XFILI =C'DEMOAST1.DAT'
	XFILO =C'DEMOAST1.LOG'
	XDUMP
LOOP     EQU   *
	XREAD CARD
	BNZ   EOF
	XPRNT CARD,80
	B     LOOP
EOF      EQU   *
	XDUMP CARD,80
	XDUMP CARD
	SVC   EXIT
R15      EQU   15
EXIT     EQU   0
CARD     DC    CL80' '
	END   DEMOAST1
/pre>