I personally wrote the enclosed software which allows a simulated SimH RK05
to be transferred onto a real RK05 disk.
Permission is granted for personal use. Any commercial use is forbidden.
Some portions were written by others, or were based on software written
by others. Attribution is provided where applicable.
There are 2 components to the software. Part of the software runs on the
real PDP-11 machine and part runs on a host containing the SimH disk.
In my setup, I use an Asus EEE netbook as my host and the target machine is
The EEEpc can run SimH and can boot the simulated disk and run the software.
Lacking a serial port, a USB to RS232 adapter is used. Crunch Bang Linux is
installed on the machine. Java along with a GNU serial communication package
is used to provide a flexible platform. Theoretically, Windows, Linux and
Mac should all be supported.
The PDP-11/10 has 32kW of core memory, RK05j disk, M7800 serial card, TS03
9-track 800bpi tape drive and a Centronics 101A line printer.
It is possible to use the software to connect the host software to the telnet
console port of a PDP-11 running under SimH.
RKDDBOOT.PDP (assembled binary)
RKDDBOOT.od (octal dump of RKDBOOT.PDP)
RKDD.PDP (assembled binary)
on PDP11 toggle in rkkBootstrap.PDP:
010000 012700 MOV #0, r0
010004 012701 MOV #176500, r1
010010 105711 read: TSTB (r1)
010012 100376 BPL read
010014 116120 MOVB 2(r1),(r0)+
010020 000773 BR read
on PDP11 start at 010000
java rkddBoot -p /dev/ttyUSB0 -b 9600 -d 10 RKDD.PDP
on PDP11 halt
on PDP11 start at 001000
on host write disk:
java rkdd -p /dev/ttyUSB0 -b 9600 -d 10 -s 0 -e 4871 -w RSTS4B.DSK
on host read disk:
java rkdd -p /dev/ttyUSB0 -b 9600 -d 10 -s 0 -e 4871 -r RSTS4B.DSK.tmp
on host verify:
diff -b RSTS4B.DSK RSTS4B.DSK.tmp
on PDP11 bootk RK05 Disk Unit 0 (http://www.psych.usyd.edu.au/pdp-11/bootstraps.html)
Loc. Cont. Instruction Comment
001000 012700 mov #rkwc, r0 controller address
001004 012710 mov #-256,(r0) set the word count
001010 012740 mov #5,-(r0) read command
001014 105710 tstb (r0) wait for ready
001016 100376 bpl .-2
001020 005007 clr PC auto start