Difference between revisions of "DECstation"
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Revision as of 10:05, 26 January 2005
DECstation is the name for a MIPS-based workstation series manufactured by DEC during the 90s. The major models have been the DECstation 2100/3100, the DECstation 5000/1xx, the DECstation 5000/2xx and the Personal DECstation 5000/xx series. They are supported to a varying degree by Linux/MIPS. The major Linux distribution that supports them is the Debian/mipsel port.
DECstations have been equipped with various CPU types ranging from the MIPS R2000 (in the models 2100 and 3100), MIPS R3000 (in the models 5000/20, /25, /33; 5000/120, /125, /133, 5000/200 and /240) over the MIPS R4000 (in the models 5000/50 and 5000/150) to the MIPS R4400 in the model 5000/260.
The models 2100 and 3100 can be equipped with up to 24MB of RAM, for the 5000/xx the limit is at 40MB, the 5000/1xx can take up to 128MB and the /2xx models can theoretically be brought to a maximum of 480MB. Memory modules are DEC-specific: the 5000/xx and /1xx take small-sized 80pin SIMMs with either 2MB or 8MB; in the /2xx series you find quite big daugtercards with either 8MB or 32MB per card.
The Personal DECstation 5000/xx has onboard graphics which can display 1024x768 pixels with 8bit color. The DECstation 5000/1xx and /2xx series do not have onboard graphics but are normally equipped with a TurboChannel graphics adapter. The DECsystem 5000/1xx and /2xx are headless variants of the equivalent DECstation series, which can be "converted" to a DECstation by adding a graphics board.
Up to now, only a few graphics options are (at least partially) supported by Linux-MIPS:
- Personal DECstation onboard graphics: 8bit color, 1024x768 pixels
- PMAG-A: monochrome, 1280x1024 pixels
- PMAG-B: 8bit color, 1024x864 pixels, dumb framebuffer
- PMAGB-B: 8bit color, 1280x1024 pixels, smart framebuffer (acceleration features unsupported in Linux/MIPS)
SCSI cotroller (PMAZ-AA) is based on the NCR 53C90 also known as QLogic ESP216 or asc.
Ethernet controller (PMAD-AA) is based on the LANCE chip.