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1401

Using simh, pdp11 emulator under Coherent 4.2.x 

 What You need

• pdp11 binary Download

• original pdp boot images , download it from http://www.tuhs.org TUHS

Other emulators available : pdp1, i1401(IBM computer from times of UNIVAC and von Neumann)

Installation /Running

• copy pdp11 binary to /usr/bin

• create own directory for example /pdp11

• cd /pdp11

• create emulator startup file pdp11.start, details as above : http://www.tuhs.org

• type : pdp11 pdp11.start

• type few commands to boot the image : details as above

Status/tested

• Boot images tested: v7_rl02,v7_rk05,Ultrix-11 3.x,2.9BSD

• You can compile using cc or pcc

• most Unix commands work fine , even vi etc

• how it compares to apout ? apout is a user level emulator, it allows to run programs only. simh emulator allows to boot original operating system

Hints :

1)CTRL/D to switch to multiuser mode after booting image(after prompt # appears)

2)CTRL/E to comeback to simulator(or how to leave the booted OS)

3)set cpu 3072K (use in Ultrix-11 startup file), if message “too big” is produced

4)if login in multiuser state fails , reboot and change password of root using passwd in single user mode) and then CTRL/D

5)if visual problems with vi in Ultrix , start emulator in xterm

License : non-commercial use only

Author :

Bob Supnik