Of all the stuff I have amassed over the years, dial up modems are the most useless. I keep them around to harvest small caps and other parts off of.. but I haven't actually used an internal modem ANYWHERE since maybe 2001.
I'm starting to also think that parallel cables with centronics connectors on one end are nearly useless as well, because as I find more and more vintage gear, I find more cables and nothing to use them on. I can't even remember the last time I saw a parallel printer... probably because consumer printers have been garbage for probably 20 years and everyone threw them away. The only parallel device I have owned in the past 15 years is a Linksys SCSI to Parallel adapter that came with an external 1x SCSI CDROM drive that takes caddies... and that adapter just uses a standard 25 pin connection, not a centronics.
To make it worse, they tend to be extremely bulky. I have one with a cord that is nearly 3/4 inch in diameter, and the cable is only like 5 feet long.... WHY?
Now for some blitting from the back buffer.