VAX-11/780

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The first VAX Introduced in 1977.


VAX-11/780
Codename: Star
Year Introduced: October 1977
CPU: KA780
Clock Speed: 200 ns
VUPS: 1.0
A 'typical' Vax-11/780 setup.


This was the first VAX from Digital Equipment Corporation. The VAX was the sucessor to the PDP-11, and in order to make the VAX seem more PDP-11 friendly, they retained the -11 monkier for the first VAX's, hence the 11/780 designation. The 11/780 didn't have normal firmware, instead it loaded it's microcode from floppy.

Emulation

SIMH is the only known emulator for the 11/780. Simh can address up to 128Mb of ram emulating an 11/780. Also the following periphals are emulated:

  • TLB Translation buffer
  • SBI
  • MCTL0, nexus=1
  • MCTL1, nexus=2
  • UBA, nexus=3, autoconfiguration enab
  • MBA0, nexus=8
  • MBA1, nexus=9
  • TODR Time of day
  • TMR
  • TTI
  • TTO
  • RX
  • DZ, address=2013E040-2013E05F*, vect
  • CR, address=2013FE70-2013FE77, vecto
  • LPT, address=2013FF4C-2013FF4F, vect
  • RP, Massbus adapter 0, 8 units
  • RL, address=2013F900-2013F909, vecto
  • HK, address=2013FF20-2013FF3F, vecto
  • RQ, address=2013F468-2013F46B*, no v
  • RQB, disabled
  • RQC, disabled
  • RQD, disabled
  • RY, address=2013FE78-2013FE7B*, vect
  • TU, Massbus adapter 1, TM03, 8 units
  • TS, address=2013F550-2013F553, vecto
  • TQ, TU81 (180MB), address=2013F940-2
  • XU, disabled
  • XUB, disabled



More information about SIMH's VAX 11/780 emulation can be found here.

Operating Systems

The 11/780 was to ship with VMS 1.0.

  • VMS 1.0 - ?.0
  • 32v
  • Ultrix
  • BSD (CSRG flavor)
  • NetBSD
  • OpenBSD


There was also the VAX-11/785, which was an upgraded version.