Why can only some machines see netboot images at the startup screen?

I have a 10.6.6 server running as a netboot server. I have about 10 images running on the server that consist of a 10.6.6 and 10.5.8 triage partition and a 10.6.6 and 10.5.8 restore image. Now what I have noticed is that newer machines after starting up and holding down the option key will see all the available images.But on some older intel machines nothing will show up after holding the option key down accept the internal drive itself, But if you hold down the N key it WILL boot to the default image.
I have made sure and checked that the ethernet port was working on the older machines. I also made sure that I can see the images from the startup control panel. All machines can see the netboot images from the startup control panel, but older intel versions cant. However I was able to sometimes get the old white and black macbooks to see the images but others not.
Any suggestions as to why some machines will see the images at the startup screen after holding the option key and why some wont?

That, most likely, means that you have a fairly large number of images and/or they have very long names.
The number of images that can be displayed is limited by the size of the data packet which contains the NetBoot volume information. Two techniques we use to keep this in check are 1) aggressive purging of outdated images, and 2) use of shorter display names (the one seen in Startup Disk, not the one in the NetBootSP0 folder).

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