Re-added the IBM PS/2 model 70 type 4 (Softfloat is always used in this machine).

src/machine/m_ps2_mca.c

@@ -1495,3 +1495,24 @@ machine_ps2_model_80_axx_init(const machine_t *model)
 
     return ret;
 }
+
+int
+machine_ps2_model_70_type4_init(const machine_t *model)
+{
+    int ret;
+
+    ret = bios_load_interleaved("roms/machines/ibmps2_m70_type4/64F3126.BIN",
+                                "roms/machines/ibmps2_m70_type4/64F3125.BIN",
+                                0x000e0000, 131072, 0);
+
+    if (bios_only || !ret)
+        return ret;
+
+    machine_ps2_common_init(model);
+
+    ps2.planar_id = 0xf9ff;
+
+    ps2_mca_board_model_70_type34_init(1, 4);
+
+    return ret;
+}