Start with no continues:
003-F7A-F7E 

Unlimited continues:
00A-1AA-19E 

Invincibility after one hit:
00E-83B-19E
Only active until the end of the level. 

Start with 2 continues:
023-F7A-F7E 

Start with 9 continues:
093-F7A-F7E 

Start with 1 Pow after 1st life:
013-A7F-E66 

Start with 7 Pows after 1st life:
073-A7F-E66 

Unlimited Pows:
FA3-C59-4C1 

Unlimited time:
2A2-02B-A22
This code must be disabled to advance in some areas. 

More lives and power:
88B-68B-E66 

Unlimited lives:
FA3-AFF-4C1