Discovered That VISTA Has No Boot.ini File

I have been dual booting XP PRO for some time, with my main operating system on drive 1 (Primary Master) and my gaming system on drive 2 (Primary Slave). I control which system to boot up by the simple modification of boot.ini thus:

[boot loader]
timeout=10
default=multi(0)disk(0)rdisk(0)partition(1)WINDOWs
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP
Professional DISK 1" /fastdetect /NoExecute=OptIn
multi(0)disk(0)rdisk(1)partition(1)WINDOWS="Microsoft Windows XP
Professional DISK 2"=optin /fastdetect

And it has worked flawlessly. Now I have bought VISTA Ultimate, removed my two XP drives, and have a beginning VISTA system up and running on a separate drive1 by itself (Primary Master). My plan now is to do a similar dual boot scenario, mixing my XP gaming drive as drive 1 with my new VISTA drive as drive 2. I figured I had to choose this order because I discovered that VISTA has no boot.ini file (?or does it?), and so will have to choose system selection from the XP drive's boot.ini file. When I tried it, booting from the XP drive worked fine. However, when I tried to boot from the VISTA drive, the bootup hung with a blank, black screen. So I figure I can't do what I am trying to do.