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:

• 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.