IBM 5150

I snagged an original IBM 5150 early model and have a couple questions about it. The unit turns on fine and tries to boot from the first floppy drive as far as I can tell, I don't have a MDA monitor and that is what card it came with. When I try a VGA 8 bit card (or my Everex EGA set to CGA) I don't get a screen and it doesn't boot from the floppy (I change the switches 5,6 from OFF/OFF to ON/ON for VGA/EGA). I tried a Taxan Super Color Graphics card but my CGA monitor just shows a few lines scrolling, seems like that card isn't standard CGA. Not sure how much RAM this thing has either. The 16-64K motherboard has 4 full banks, there is a 64K RAM card installed, and I have a MBI Monte Carlo multi function board with 4 banks full of RAM. Anybody have any information on the MBI board, there are 2x 8 block configuration switches on it that would tell me how it is set up. Also the RAM switched on the 5150 are set to OFF, OFF, OFF, OFF, OFF, ON, OFF, OFF which doesn't seem to jive with the setting options here: http://www.rci.rutgers.edu/~preid/pcxtsw.htm There is some damage to the board (was shipped with the PS loose and there is a ding by U26), not sure what that might hurt. Thanks, TZ