Fixed the "minor bug fix" in the AT / PS/2 keyboard controller, reworked PS/2 keyboard controller IRQ latches, and correctly disabled memory top remaps if there's more than (16 MB - remap size) RAM (fixes segmentation faults on some machines with 16+ MB of RAM).

src/chipset/sis_5571.c

@@ -29,6 +29,7 @@
 #include <86box/dma.h>
 #include <86box/mem.h>
 #include <86box/pci.h>
+#include <86box/pic.h>
 #include <86box/port_92.h>
 #include <86box/hdc_ide.h>
 #include <86box/hdc_ide_sff8038i.h>
@@ -725,6 +726,9 @@ sis_5571_init(const device_t *info)
 
     sis_5571_reset(dev);
 
+    pic_kbd_latch(0x01);
+    pic_mouse_latch(0x01);
+
     return dev;
 }