Here are the specs. What are my options?

OS 10.4.11
Machine Name: iBook G4
Machine Model: PowerBook6,7
CPU Type: PowerPC G4 (1.5)
Number Of CPUs: 1
CPU Speed: 1.42 GHz
L2 Cache (per CPU): 512 KB
Memory: 512 MB
Bus Speed: 142 MHz
Boot ROM Version: 4.9.3f0