I have managed to get hold of some versions of VMS, mostly VMS 4.X and I am trying to install VMS4.6 on an emulated 780 using simh.<br><br>The sequence I have followed is:<br><br>Boot using the VMS 7.3 CD<br><br>Run BACKUP to copy the REQUIRED saveset from the VMS 4.6 emulated tape to an RA81 disk with the command<br>
BACKUP/VERIFY MTA0:REQUIRED/SAVE DUA0:<br><br>However, when I boot from the RA81, expecting the installation sequence to continue, I get <br><br> VAX/VMS Version KG 15-Jun-1987 10:00<br><br><br>**** FATAL BUG CHECK, VERSION = KG INVEXCEPTN, Exception while above ASTDEL or on interrupt stack<br>
<br> CURRENT PROCESS = SWAPPER<br><br> REGISTER DUMP<br><br> R0 = 00000008<br> R1 = 04080000<br> R2 = 00000000<br> R3 = 00000000<br> R4 = 80002748<br> R5 = 00000000<br> R6 = 00000000<br>
R7 = 00000000<br> R8 = 00000000<br> R9 = 00000000<br> R10= 00000000<br> R11= 00000000<br> AP = 00000000<br> FP = 00000000<br> SP = 801F91D0<br> PC = 80004862<br>
PSL= 04080009<br><br> KERNEL/INTERRUPT STACK<br><br> 801F91D8 00000004<br> 801F91DC 00000000<br> 801F91E0 FFFFFFFD<br> 801F91E4 00000000<br> 801F91E8 00000000<br> 801F91EC 00000001<br>
801F91F0 00000003<br> 801F91F4 00000454<br> 801F91F8 8000A71B<br> 801F91FC 04080000<br><br>Reboot requested, PC: 80158B91 (HALT)<br><br><br>Has anyone any idea what is going wrong?<br><br>
I successfully installed VMS 7.3 from the CD on the 780. Experiments give a similar crash when running VMS 7.3 if I have too little memory on the 780 (less than 32MB), but no fiddling with the amount of memory seems to help with VMS 4.6.<br>
<br>I think someone out there has VMS 4.6 running, so I trust it is possible and I am doing something silly.<br><br>Peter Allan<br>