legacy system=almost antique. It basically refers to not being able to use the pc100 or pc133 ram in a your next system as it will probably be using ddr or rambus or some new memory that we havent even heard of yet. What was stated previously, may as well stick with pc100 as that is what is in your system now. The mix would probably work but may not. If you go with both pc100, most likely no problem.
Legacy usually point to any device which are non-PnP.
If mother boad has PCI slot, it's not a legacy board since all PCI & AGP are PnP.
ISA comes in both PnP and non-PnP. The modem you're refering to is non-PnP, not the drivers.
Legacy hardware and software is usually defined as being outdated. Ive never seen a narrow definition of particular equipment features or software compatibilities that drive it into legacy status it is a sliding scale as technology advances. A setup that is Win98 based could well be a legacy system in a few years when new software doesnt work on it any more. Any system with PC100 or PC133 is likely to be considered a legacy system in five or so years as new equipment and software wont work on it.
Here is a breakdown of what is considered legacy on a Mac and PC: http://www.girard248.org/general/workstation Since they define Best in a PC as having a 400Mhz Pentium I would think the page is old enough to shift the legacy equipment 1 column to the left to what was Good a couple of years ago.
Their definition of legacy hardware: Legacy (Minimum): Sub-par hardware configuration. These configurations will be noticeably slow and may have difficulty running or be unable to run newer software.
Microsoft definition: Legacy Any feature in the system based on older technology for which compatibility continues to be maintained in other system components, even though equivalent or better functionality is provided using newer, more flexible technologies.
PC 100 and 133 are both becoming obsolete and you are not likely to be able to use either in your next system. Get the PC 100 for the same price since it is going to run at 100Mhz anyway.
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