The VAXstation is the workstation version of the VAX. All of the VAXstations have corresponding or roughly corresponding MicroVAX equivalents. with the the exception of the MicroVAX 4000 Series and MicroVAX 8000 (Which is not simulated) which roughly correspond to the VAX 4000 and VAX 8000 lines, respectively. There are a total of eight VAXstations simulated and like the MicroVAXen, I will concentrate five, although I only use the VAXstation II often. All VAXstations have graphics capability. It should be noted graphics on the VAXstation 4000 series is not emulated, so these simulators are essential Simh’s only representation of the VAX 4000 Series, which was a low-end line of VAXen that replaced the MicroVAX. It should be noted, they are also microprocessor driven and like the MicroVAX 3100 line use SCSI. Simh emulates three kinds of DEC graphics: VAXstation Monochrome, used on the VAXstation 3100 series and VAXstation 2000; QVSS (VCB01), a monochrome framebuffer used on the VAXstation I and II; and the QDSS (VCB02), a color framebuffer used on the VAXstation II/GPX. Being workstations, they can run Graphical User Interfaces (GUIs). There are two are two different GUIs: VWS (VMS Workstation Software) for VMS and MicroVMS 4.x and DECwindows with XUI as an interface for OpenVMS 5.5-2 and ULTRIX 4.2 and 4.3 and Motif for later versions and ULTRIX 4.4 and 4.5. The VAXstations I, II, and 2000 have already been basically discussed but it should also be noted that they are the only ones that can use VWS. The VAXstation II is by far the the best VAXstation simulator because it is the only one that can do DECwindows for ULTRIX and the flexibility of the II plus it has a color option. The VAXstation 3100 Model 76 is of note because it is the best of the 3100s with dual SCSI controllers and supports up to 32 Megabytes of RAM. The VAXstation 4000 Model 60 is a powerhouse with up to 104 Megabytes of RAM. Unfortunately, it has no graphic support and has just one SCSI controller which makes it inferior to the MicroVAX 3900.