In article <4B7AF1F7.8030008 at softjar.se>, Johnny Billquist <bqt at softjar.se> writes: I doubt its an E&S system because its raster based. AFAIK, all the E&S terminals and DEC peripherals were vector based until the PS/390. If this were a PS/390, then it would have the characteristic black enclosure for the monitor, keyboard and tablet. Also, E&S products were high-end and had hardware line drawing at a minimum, whereas this system appears to be a simple memory-mapped frame buffer with no additional hardware acceleration. The PS/390 was the first "Picture System" to support raster operations. The primary market for these peripherals was the molecular design/molecular modeling community and they needed very high quality line renderings of their models. Until the antialiasing technology for raster graphics introduced on the PS/390 the only way to achieve that quality was to use a vector based display. The raster display decoupled the display refresh rate from the frame rendering rate, allowing very high quality renderings of complex models at the cost of interactivity. Similar technology to that used in the PS/390 was used in E&S's first workstation the ESV. I worked on the ASIC that performed this process in the ESV in the summer of 1989. The workstation was released in Q4 1989. All the E&S products were raster from then on, with the exception of calligraphic light overlays used in the simulation products. I have a PS/390 base and several ESV workstations in my collection. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>