diff --git a/scsh/irix/signals1.c b/scsh/irix/signals1.c
new file mode 100644
index 0000000..688b95b
--- /dev/null
+++ b/scsh/irix/signals1.c
@@ -0,0 +1,52 @@
+
+/* Need to turn off synchronous error signals (SIGPIPE, SIGSYS). */
+
+#include "../scsh_aux.h"
+
+/* Make sure our exports match up w/the implementation: */
+#include "../signals1.h"
+
+/* This table converts Unix signal numbers to S48/scsh interrupt numbers.
+** If the signal doesn't have an interrupt number, the entry is -1.
+** (Only asynchronous signals have interrupt numbers.)
+**
+** Note that we bake into this table the integer values of the signals --
+** i.e., we assume that SIGHUP=1, SIGALRM=15, etc. So this definition is
+** very system-dependent.
+*/
+const int sig2int[] = {
+	-1,		/* 0 is not a signal */
+	scshint_hup,	/* 1: SIGHUP */
+	scshint_keyboard,	/* 2: SIGINT */
+	scshint_quit,	/* 3: SIGQUIT */
+	-1,		/* 4: SIGILL */
+	-1,		/* 5: SIGTRAP */
+	-1,		/* 6: SIGABRT SIGIOT*/
+	-1,		/* 7: SIGEMT */
+	-1,		/* 8: SIGFPE */
+	-1,		/* 9: SIGKILL */
+	-1,		/* 10: SIGBUS */
+	-1,		/* 11: SIGSEGV */
+	-1,		/* 12: SIGSYS */
+	-1,		/* 13: SIGPIPE */
+	scshint_alarm,	/* 14: SIGALRM */
+	scshint_term,	/* 15: SIGTERM */
+	scshint_usr1,	/* 16: SIGUSR1 */
+	scshint_usr2,	/* 17: SIGUSR2 */
+	scshint_chld,	/* 18: SIGCHLD SIGCHD */
+	scshint_pwr,	/* 19: SIGPWR */
+	scshint_winch,	/* 20: SIGWINCH */
+	scshint_urg,	/* 21: SIGURG */
+	scshint_io,	/* 22: SIGIO SIGPOLL */
+	-1,		/* 23: SIGSTOP */
+	scshint_tstp,	/* 24: SIGTSTP */
+	scshint_cont,	/* 25: SIGCONT */
+	-1,		/* 26: SIGTTIN */	/* scshint_ttyin */
+	-1,		/* 27: SIGTTOU */	/* scshint_ttyou */
+	scshint_vtalrm,	/* 28: SIGVTALRM */
+	scshint_prof,	/* 29: SIGPROF */
+	scshint_xcpu,	/* 30: SIGXCPU */
+	scshint_xfsz	/* 31: SIGXFSZ */
+	};
+
+const int max_sig = 31; /* SIGXFSZ */