Looking for a few NEC upd6145s

I'm contemplating a project using a upd6145 "SPI interfaced On-Screen Display" chip. If I have the era right, it's from about 1993, and would have been used inside TVs and VCRs to crate menu/overlay text for setting preferences. There's one on eBay right now, but I hate to do this kind of work with one chip and no spares. Also, I can't seem to find the specs on it. There is at least one project out there using it, so I could probably determine all the pins from where it fits in the circuit, but a datasheet is always handy. So... before I dig too deeply, does anyone here know of a vendor that might have 2-3 of these? I'd probably settle for a brand/model number for a sighting if anyone happens to be into TV guts. Thanks for any pointers, -ethan