I eventually figured out that the ISA card that I was using was probably just too old and either wasn't compatible or didn't work. I did however, find a sample xorg.conf for a dual monitor setup in a thread somewhere on this forum. I copied and saved it and it is below. I may try a dual monitor setup again sometime with the PCI monitor card from another computer.
HTH
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
ModulePath "/usr/X11R6/lib/modules"
FontPath "/usr/X11R6/lib/X11/fonts/misc/"
FontPath "/usr/X11R6/lib/X11/fonts/TTF/"
FontPath "/usr/X11R6/lib/X11/fonts/Type1/"
FontPath "/usr/X11R6/lib/X11/fonts/CID/"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/truetype/"
FontPath "/usr/X11R6/lib/X11/fonts/local/"
FontPath "/usr/X11R6/lib/X11/fonts/cyrillic/"
EndSection
Section "Module"
Load "glx"
Load "extmod"
Load "xtrap"
Load "record"
Load "dbe"
Load "dri"
Load "freetype"
Load "type1"
EndSection
Section "ServerFlags"
Option "DontZap"
Option "Xinerama" "true" # Use both as one big screen
EndSection
Section "Extensions"
Option "Composite" "Enable"
Option "RENDER" "Enable"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbLayout" "us,il"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/mouse"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "Monitor0"
HorizSync 75
VertRefresh 60
Option "DPMS"
Option "FlatPanel"
EndSection
Section "Monitor"
Identifier "Monitor1"
HorizSync 75
VertRefresh 60
Option "DPMS"
Option "FlatPanel"
EndSection
Section "Device"
Identifier "Card0"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "Unknown Board"
Option "Rotate" "CCW"
BusID "PCI:7:0:0"
Option "UseEdidFreqs" "true"
Option "RenderAccel" "true"
Option "AllowGLXWithComposite" "true"
Screen 0
EndSection
Section "Device"
Identifier "Card1"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "Unknown Board"
Option "Rotate" "CCW"
BusID "PCI:7:0:0"
Option "UseEdidFreqs" "true"
Option "RenderAccel" "true"
Option "AllowGLXWithComposite" "true"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "2560x1600"
ViewPort 0 0 # initial origin if mode is smaller than desktop
EndSubsection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "Monitor1"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "2560x1600"
ViewPort 0 0 # initial origin if mode is smaller than desktop
EndSubsection
EndSection
Section "DRI"
Mode 0666
EndSection