On 26 Jul 2013, at 10:05, Paul_Koning <Paul_Koning at Dell.com> wrote: If you dropped into the simh prompt, that would make it a simh bug. And that message looks like a Unix message; it doesn't look like a RSTS message. That s what I was thinking. Issue persists with both -O2 and -O0 so it s not GCC being stupid (for once). This is latest git issue isn t present in 3.9. paul On Jul 26, 2013, at 8:57 AM, Cory Smelosky wrote: Morning all, Restoring MAIL installation files from the MAIL Library kit TQ I/O error: Resource temporarily unavailable I/O error, PC: 102054 (SOB R1,102052) sim> I can't even begin to find what would cause this...is it a bug in SIMH or have I found the weirdest IPC error yet? Is it an underlying I/O error on the disk? -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects