Does anyone know what the file format is for ~/.genrc

The file ~/.genrc is created once you store the settings. Here's an example ~/.genrc:

; Generator 0.35 configuration file

; for GTK keysyms see include/gtk-1.2/gdk/gdkkeysyms.h

; view mode to use in percent
; values: 100, 200, fullscreen
view = 100

; hardware region
; values: domestic, overseas
region = overseas

; video standard
; values: ntsc, pal
videostd = ntsc

; automatic region, videostd detection
; values: on, off
autodetect = on

; plotter style - line is slower but much more accurate
; values: line, cell
plotter = line

; style of de-interlacing to use in 200% view mode
; values: bob, weave, weave-filter
interlace = bob

; skip frames to keep up - auto setting needs sound turned on
; values: auto, 1..10
frameskip = 0

; horizontal over-scan border surrounding main playing area
; values: 0..32
hborder = 2

; vertical retrace border surrounding main playing area
; values: 0..32
vborder = 2

; sound system toggle, also turns off fm and psg (not z80)
; values: on, off
sound = on

; z80 cpu
; values: on, off
z80 = on

; frequency modulation sound generation
; values: on, off
fm = on

; programmable sound generation
; values: on, off
psg = on

; try to buffer this many fields of sound
; values: integer
sound_minfields = 5

; maximum buffered sound fields before blocking (waiting)
; values: integer
sound_maxfields = 10

; logging level
; values: integer (0-7)
loglevel = 0

; extra sound debug logging
; values: on, off
debugsound = off

; status bar on main window (fps counter)
; values: on, off
statusbar = on

; keyboard player 1 'A' button
; values: gdk keysym
key1_a = a

; keyboard player 1 'B' button
; values: gdk keysym
key1_b = s

; keyboard player 1 'C' button
; values: gdk keysym
key1_c = d

; keyboard player 1 up
; values: gdk keysym
key1_up = Up

; keyboard player 1 down
; values: gdk keysym
key1_down = Down

; keyboard player 1 left
; values: gdk keysym
key1_left = Left

; keyboard player 1 right
; values: gdk keysym
key1_right = Right

; keyboard player 1 start button
; values: gdk keysym
key1_start = Return

; keyboard player 2 'A' button
; values: gdk keysym
key2_a = KP_Divide

; keyboard player 2 'B' button
; values: gdk keysym
key2_b = KP_Multiply

; keyboard player 2 'C' button
; values: gdk keysym
key2_c = KP_Subtract

; keyboard player 2 up
; values: gdk keysym
key2_up = KP_8

; keyboard player 2 down
; values: gdk keysym
key2_down = KP_2

; keyboard player 2 left
; values: gdk keysym
key2_left = KP_4

; keyboard player 2 right
; values: gdk keysym
key2_right = KP_6

; keyboard player 2 start button
; values: gdk keysym
key2_start = KP_Enter

; AVI forced skip, e.g. 2 is 30fps
; values: integer
aviframeskip = 2

; Type of output to be written to AVI
; values: rgb, jpeg
aviformat = jpeg

; JPEG quality - 100 is least compression but best picture
; values: 0-100
jpegquality = 100

; Low-pass sound filter - 0 turns it off, 100 filters too much
; values: 0-100
lowpassfilter = 1

; Samplerate to use for audio
; values: 11025, 22050, 44100, 48000
samplerate = 44100