here is the config file for pearpc ass configured on my setup:

ppc_start_resolution = "1280x720x15"

redraw_interval_msec = 20
##redraw_interval_msec = 50

key_compose_dialog = "F11"
key_change_cd_0 = "none"
key_toggle_mouse_grab = "F12"
key_toggle_full_screen = "Alt+Return"

prom_bootmethod = "select"
#prom_bootmethod = "force"
#prom_loadfile = "test/yaboot"
#prom_env_bootpath = "disk"
#prom_env_bootargs = ""
prom_env_machargs = "-v"
prom_driver_graphic = "video.x"

#page_table_pa = 104857600
## these cpu_pvr's were tested on my machines - might not work on yours
cpu_pvr = 0x000c0209 ##g4 715 - but fast
##cpu_pvr = 0x000c0201 ##g4 744 - sluggish
##cpu_pvr = 0x000c0000 ##g4 744 - sluggish
##cpu_pvr = 0x00088302
memory_size=0x40000000

pci_ide0_master_installed = 1
pci_ide0_master_image = "master image here"
pci_ide0_master_type = "hd"

pci_ide0_slave_installed = 0
pci_ide0_slave_image = "slave image here"
pci_ide0_slave_type = "cdrom"
##pci_ide0_slave_installed = 1
##pci_ide0_slave_image = "slave drive here in caps"
##pci_ide0_slave_type = "nativecdrom"

pci_3c90x_installed = 0
pci_3c90x_mac = "de:ad:ca:fe:12:34"
pci_rtl8139_installed = 1
pci_rtl8139_mac = "de:ad:ca:fe:12:34"
pci_usb_installed = 1
nvram_file = "nvram"