Hardware vs Simh

So do I. I much prefer to diagnose and rpeair faults logically, aomethign you cna do wit hthe older machines. I am currnetly having a conversation with a guy in the Netherlands who is repairing a machine of a simialr fintage (not a PDP11). He's borrowed a logic analyser and we're goign thoguh it a the level of 'Well, in this microisntrucionm, the program counter is fed ot one inptu of the LAU, a constand 1 is fed to the other intput, so as to add 1 to the PC ot increment it. Now let's see if that's what's going on...' (OK, it's not quite that, the machine in question is bit-serial...) HE seems ot be loving it. Being able to see how registers are sleected, ho data flows from one ot anotehr, and so on . I hate t osay this, but has a hardware hacker, half the time once I've got a system working and running the OS, I lose interest in it and find soemthing else to wrok on :-). And then, of course, go back to thwroking amchine when I have some new peripheral to add to it. -tony