Simple 8-bit D-A / load meter?

I've dug around a bunch, even here http://www.ibiblio.org/pub/Linux/system/status/!INDEX.short.html ... where I thought things were, but I appear to have lost an old file that described how to make a simple D-A that one could hang off of an 8-bit I/O port to generate a voltage from approx 0 VDC to +5VDC. Does anyone remember an ancient file describing how to build such a device? ISTR it resembles a Disney Sound Source, a klunky dongle that was supported by such games as "Return to Zork" if you didn't have a sound card in your machine... more or less a resistor ladder that allows you to eject waveforms that sound more or less like something you'd expect to hear coming out of a cheap PC sound card. Yes, I could design this from scratch... but since I built one a few years ago from a file I found while grubbing around for external load meter hardware, I'd rather just use something like that as a starting point than take the time to reinvent the wheel. Thanks for any and all pointers to this tidbit of knowledge. -ethan