diff --git a/amach.awk b/amach.awk
index c0561fe..3bd695a 100644
--- a/amach.awk
+++ b/amach.awk
@@ -253,7 +253,6 @@ function amach_exit(code,   fd) {
 function handle_ecall(callnum, a0, a1, a2, a3, a4, a5,  i, reclen, cmd, line, arr) {
   ECALL_COUNT++
   if(ECALL_COUNT == 1) POST_ECALL_IC = ic
-  printf("ECALL #%d: call=%d a0=%d a1=0x%X a2=%d pc=0x%X ic=%d\n", ECALL_COUNT, callnum, a0, uint32(a1), a2, pc-4, ic) > "/dev/stderr"
   if(callnum == 34) { # sys_mkdirat
     a1 = resolve_path(a0, read_str(a1))
     if(path_exists(a1)) setreg(10, -17) # -EEXIST
@@ -394,9 +393,6 @@ function handle_ecall(callnum, a0, a1, a2, a3, a4, a5,  i, reclen, cmd, line, ar
         for(i = 0; i < a2; i++)
           MEM[uint32(a1 + i)] = FD_DATA[a0, a3 + i]
         FD_OFFSET[a0] = a3 + a2
-        printf("DEBUG sys_read fd=%d: wrote %d bytes to 0x%X. First 16:", a0, a2, uint32(a1)) > "/dev/stderr"
-        for(k=0; k<16; k++) printf(" %d", MEM[uint32(a1)+k]+0) > "/dev/stderr"
-        printf("\n") > "/dev/stderr"
         setreg(10, a2)
       }
     } else setreg(10, -9) # -EBADF