MicroVAX III was the generic name erroneously given to the 3rd-generation series of DEC VAX microcomputers by the computer press. It was not a formal DEC product name; the confusion probably occurred because the KA630 CPU of the MicroVAX II was succeeded by the KA650 CPU, and people assumed the name of the VAX systems which used it followed.
The KA650 CPU was implemented in VLSI.
These computers used the QBUS for their I/O only; main memory traffic used the KA650 Main Memory System, which used a special bus carried on over the back connectors as well as the CD interconnect of the QBUS backplane. (The address space of the QBUS was limited to 4MB, and the data section is only 16 bits wide, so there were good reasons for partially replacing it.)
Systems which used the KA650 included:
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|v • d • e VAX Computers and Operating Systems|
| VAX-11/7xx (including VAX 86x0) - VAX-11/780 • VAX-11/785 • VAX-11/750 • VAX-11/730 • VAX 8600 • VAX 8650
VAX 8000 series (excluding VAX 86x0) - VAX 82xx/83xx series • VAX 85x0/8700/88xx series
(Many types below may also come in the form of VAXserver and VAXstation models.)
MicroVAXen - MicroVAX I • MicroVAX II • MicroVAX 2000 • MicroVAX 3100
VAXstation Series - VAXstation I • VAXstation II • VAXstation 3200/3500 • VAXstation 3520/3540 • VAXstation 8000
Late Model VAXen - VAX 4000 series • VAX 6000 series • VAX 7000 series • VAX 9000 series • VAX 10000 series
Special Purpose VAXen - VAXft series • rtVAX series • Infoserver series
Clones - CM 1700 • TPA-11/580