The HP LaserJet 1020 is a low cost, low volume, monochromatic laser printer. It was a replacement for the HP LaserJet 1012. The production started in June 2005.
In contrast to less compact, more powerful, laser printers, it only exposes ZjStream externally.
The LaserJet 1020 was studied to determine particulate emission and its potential effects on health. The 1020 was found to be a moderate emitter of particulates. A full copy of the report can be found here, whereas HP's response can be found here.
It uses a black toner print cartridge number Q2612A with 2,000-page capacity at the standard five percent coverage.