|The MicroVAX was based on the
MicroVAX II and its support chips, and was placed into a remarkably small
enclosure. It didn't have an expansion bus, but had a tape port, which
was later found to be a normal SCSI-port (although DEC sold the machines
with MFM disks).
The VAXstation 2000 had a 2/8-plane graphics option (monchrome graphics was integrated onto the "motherboard"). Storage expansion was possible using expansions boxes, since the enxlosure was very tight. It was one of the most succesfull graphical workstations ever, and they are very durable too: I've seen production MicroVAX 2000's with uptimes like 410 days (using Ultrix)!
|If 1986 was the year of the
VAXBI, then 1987 was the year of the new CVAX
chip, which was about 3 times faster than the MicroVAX II, and
featured something new called "second-level cache" (we're all familiar
with this term now, I guess). The first systems with the new chip were
the MicroVAX 3500 and MicroVAX 3600, based on the KA650
CPU module (qbus). There is some confusion out there with the
different packaking, here's my version to what's what:
|Pre-configured clusters with processors, HSC's, storage arrays. A 8978 is 8 8810 (4 GB RAM), 2 HSC's, 2 SA482's, 4 TA79's and a MicroVAX II as console. A 8974 is something similar with only 4 8810 processors and fewer I/O devices.|
PDP-11/53: 1987 was a busy year in Digital's life: apart from the above VAXen, they also introduced the new low-end PDP-11/53.