Revert "Merge branch 'feature/machine_and_kb' into master"

This reverts commit 6604a29d7e, reversing
changes made to 1d7fca0abd.

src/machine/m_xt_olivetti.c

@@ -44,7 +44,6 @@
 #include <86box/fdc.h>
 #include <86box/fdc_ext.h>
 #include <86box/gameport.h>
-#include <86box/port_6x.h>
 #include <86box/sound.h>
 #include <86box/snd_speaker.h>
 #include <86box/video.h>
@@ -766,9 +765,6 @@ machine_xt_m240_init(const machine_t *model)
 
     pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
 
-    /* Address 66-67 = mainboard dip-switch settings */
-    io_sethandler(0x0066, 2, m24_read, NULL, NULL, NULL, NULL, NULL, NULL);
-
     /* 
      * port 60: should return jumper settings only under unknown conditions
      * SWB on mainboard (off=1)
@@ -776,7 +772,6 @@ machine_xt_m240_init(const machine_t *model)
      * bit 6 - use OCG/CGA display adapter (on) / other display adapter (off)
      */
     device_add(&keyboard_at_olivetti_device);
-    device_add(&port_6x_olivetti_device);
 
     /* FIXME: make sure this is correct?? */
     device_add(&at_nvr_device);