diff --git a/hw/sun4m.c b/hw/sun4m.c
index b7bd51f..bb44d47 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -35,6 +35,7 @@
 #include "pc.h"
 #include "isa.h"
 #include "fw_cfg.h"
+#include "escc.h"
 
 //#define DEBUG_IRQ
 
@@ -88,6 +89,8 @@
 #define MAX_CPUS 16
 #define MAX_PILS 16
 
+#define ESCC_CLOCK 4915200
+
 struct sun4m_hwdef {
     target_phys_addr_t iommu_base, slavio_base;
     target_phys_addr_t intctl_base, counter_base, nvram_base, ms_kb_base;
@@ -552,11 +555,11 @@
                           slavio_cpu_irq, smp_cpus);
 
     slavio_serial_ms_kbd_init(hwdef->ms_kb_base, slavio_irq[hwdef->ms_kb_irq],
-                              nographic);
+                              nographic, ESCC_CLOCK, 1);
     // Slavio TTYA (base+4, Linux ttyS0) is the first Qemu serial device
     // Slavio TTYB (base+0, Linux ttyS1) is the second Qemu serial device
-    slavio_serial_init(hwdef->serial_base, slavio_irq[hwdef->ser_irq],
-                       serial_hds[1], serial_hds[0]);
+    escc_init(hwdef->serial_base, slavio_irq[hwdef->ser_irq], serial_hds[1],
+              serial_hds[0], ESCC_CLOCK, 1);
 
     cpu_halt = qemu_allocate_irqs(cpu_halt_signal, NULL, 1);
     slavio_misc = slavio_misc_init(hwdef->slavio_base, hwdef->apc_base,
@@ -1345,11 +1348,11 @@
                           sbi_cpu_irq, smp_cpus);
 
     slavio_serial_ms_kbd_init(hwdef->ms_kb_base, sbi_irq[hwdef->ms_kb_irq],
-                              nographic);
+                              nographic, ESCC_CLOCK, 1);
     // Slavio TTYA (base+4, Linux ttyS0) is the first Qemu serial device
     // Slavio TTYB (base+0, Linux ttyS1) is the second Qemu serial device
-    slavio_serial_init(hwdef->serial_base, sbi_irq[hwdef->ser_irq],
-                       serial_hds[1], serial_hds[0]);
+    escc_init(hwdef->serial_base, sbi_irq[hwdef->ser_irq], serial_hds[1],
+              serial_hds[0], ESCC_CLOCK, 1);
 
     if (drive_get_max_bus(IF_SCSI) > 0) {
         fprintf(stderr, "qemu: too many SCSI bus\n");
@@ -1558,11 +1561,11 @@
                         hwdef->nvram_size, 2);
 
     slavio_serial_ms_kbd_init(hwdef->ms_kb_base, slavio_irq[hwdef->ms_kb_irq],
-                              nographic);
+                              nographic, ESCC_CLOCK, 1);
     // Slavio TTYA (base+4, Linux ttyS0) is the first Qemu serial device
     // Slavio TTYB (base+0, Linux ttyS1) is the second Qemu serial device
-    slavio_serial_init(hwdef->serial_base, slavio_irq[hwdef->ser_irq],
-                       serial_hds[1], serial_hds[0]);
+    escc_init(hwdef->serial_base, slavio_irq[hwdef->ser_irq], serial_hds[1],
+              serial_hds[0], ESCC_CLOCK, 1);
 
     slavio_misc = slavio_misc_init(0, 0, hwdef->aux1_base, 0,
                                    slavio_irq[hwdef->me_irq], NULL, &fdc_tc);