The LaserWriter is a series of laser printers from Apple Computer.
LaserWriter 4/600 PS
The LaserWriter 4/600 PS printer is a mainstream network laser printer designed for the small-business market. Replacing the Personal LaserWriter 320, it supports PostScript Level 2 functions and produces up to four printed pages per minute. The LaserWriter 4/600 PS printer has improved imaging capabilities and supports 600-dpi (dots per inch) resolution. Using Adobe Memory Booster Technology (AMBT) it accomplishes this with only 2 MB of DRAM.
LaserWriter 12/640 PS
The LaserWriter 12/640 PS printer is a mainstream network laser printer designed for midsize to large businesses, higher education institutions, Macintosh and non-Macintosh networks, and graphics and desktop publishing environments. It supports Adobe PostScript Level 2 programming functions and produces printed pages at a rate of up to 12 letter-size pages per minute. The LaserWriter 12/640 PS printer supports 600 dpi resolution. FinePrint can be selected to smooth text and line art. FinePrint technology gives the printer the ability to print dots of different widths, producing crisper text and graphics.
The printer also supports PhotoGrade printing. This is a technology that enables the LaserWriter 12/640 PS printer to print photographs with as many as 97 shades of gray. PhotoGrade can designate more than one level of gray for each pixel by controlling the size of the dots. Photographs printed using PhotoGrade technology retain a higher level of detail than that achieved by other 600-dpi laser printers. You need a minimum of 12 MB of DRAM, implemented by the 8 MB DRAM update, to support this feature.
The LaserWriter 12/640 PS printer comes with 4 MB of DRAM installed in one of its two SIMM slots. You can expand DRAM capacity up to 64 MB by using higher capacity SIMMs and populating both slots. The LaserWriter 12/640 PS has separate controller systems for imaging and I/O processing. The imaging system uses an AMD AM29040 processor, and the I/O processing system uses an 80C186 embedded processor. The imaging and I/O systems share messages and data through a shared SRAM (static RAM).