I have a DECSystem 5000/240 with a KN03-AA 5.1b ROM.
When I do 'boot 3/tftp' I get the following:

???
? PC: 0x80021fe4<vtr=NRML>
? CR: 0x30000010<CE=3,EXC=AdEL>
? SR: 0x30080000<CU1,CU0,CM,IPL=8>
? VA: 0xa000ef3a

Which looks like a debug trap to me.(although I'm not
familiar with mips or the DECSystem, yet).

Is there any solution to this problem? An alternative
way I can get the DECSystem booting or?

-Matt