diff --git a/qemu/saimaa.c b/qemu/saimaa.c
index d6fe169..35c220b 100644
--- a/qemu/saimaa.c
+++ b/qemu/saimaa.c
@@ -177,6 +177,14 @@ static void saimaa_uart_write(void *opaque, hwaddr off, uint64_t val,
     SaimaaUartState *s = SAIMAA_UART(opaque);
     (void)s;
     if (off == 0x70) { /* UARTDM_TF */
+        static int uart_n;
+        if (uart_n < 64) {
+            fprintf(stderr, "saimaa-uart: TX 0x%02x '%c'\n",
+                    (unsigned)(val & 0xff),
+                    (val & 0xff) >= 32 && (val & 0xff) < 127 ?
+                    (char)(val & 0xff) : '.');
+            uart_n++;
+        }
         putchar(val & 0xff);
         fflush(stdout);
         return;