VAX-11/780

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:

• CPU VAX-11/780 CPU
• TLB translation buffer
• SBI system bus controller
• MCTL0,MTCL1 memory controllers, MS780C with 4MB memory each, or MS780E with 8MB-64MB each
• UBA DW780 Unibus adapter
• MBA0,MBA1 RH780 Massbus adapters
• TODR time-of-day clock
• TMR interval timer
• TTI,TTO console terminal
• RX console RX01 floppy disk
• DZ DZ11 8-line terminal multiplexer (up to 4)
• CR CR11 card reader
• LPT LP11 line printer
• RP RP04/05/06/07, RM02/03/05/80 Massbus disks, up to eight drives
• HK RK611/RK06(7) cartridge disk controller with eight drives
• RL RL11/RL01(2) cartridge disk controller with four drives
• RQ [[[UDA50]] MSCP controller with four drives
• RQB second UDA50 MSCP controller with four drives
• RQC third UDA50 MSCP controller with four drives
• RQD fourth UDA50 MSCP controller with four drives
• RY RX211 floppy disk controller with two drives
• TS TS11 magnetic tape controller with one drive
• TQ TUK50 TMSCP magnetic tape controller with four drives
• TU TM03 tape formatter with eight TE16/TU45/TU77 drives
• XU DEUNA/DELUA Ethernet controller
• XUB second DEUNA/DELUA Ethernet controller

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.