diff --git a/src/mem.c b/src/mem.c
index 23d6523..6b6f590 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -2315,10 +2315,10 @@ void mem_init()
 
         memset(_mem_state, 0, sizeof(_mem_state));
 
-        mem_set_mem_state(0x000000, (mem_size > (AT ? 640 : 768)) ? (AT ? 0xa0000 : 0xc0000) : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+        mem_set_mem_state(0x000000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
         mem_set_mem_state(0x0c0000, 0x40000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
 
-        mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > (AT ? 640 : 768)) ? (AT ? 0xa0000 : 0xc0000) : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
+        mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
         if (mem_size > 1024)
         {
                 if (cpu_16bitbus && mem_size > 16256)
@@ -2377,6 +2377,12 @@ void mem_remap_top_384k()
         mem_remap_top(384);
 }
 
+void mem_set_704kb()
+{
+        mem_set_mem_state(0x000000, (mem_size > 704) ? 0xb0000 : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+        mem_mapping_set_addr(&ram_low_mapping, 0x00000, (mem_size > 704) ? 0xb0000 : mem_size * 1024);
+}
+
 void mem_resize()
 {
         int c;
@@ -2416,10 +2422,10 @@ void mem_resize()
         
         memset(_mem_state, 0, sizeof(_mem_state));
 
-        mem_set_mem_state(0x000000, (mem_size > (AT ? 640 : 768)) ? (AT ? 0xa0000 : 0xc0000) : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+        mem_set_mem_state(0x000000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
         mem_set_mem_state(0x0c0000, 0x40000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
         
-        mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > (AT ? 640 : 768)) ? (AT ? 0xa0000 : 0xc0000) : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
+        mem_mapping_add(&ram_low_mapping, 0x00000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, mem_read_ram,    mem_read_ramw,    mem_read_raml,    mem_write_ram, mem_write_ramw, mem_write_raml,   ram,  MEM_MAPPING_INTERNAL, NULL);
         if (mem_size > 1024)
         {
                 if (cpu_16bitbus && mem_size > 16256)
diff --git a/src/mem.h b/src/mem.h
index edde319..2aabde9 100644
--- a/src/mem.h
+++ b/src/mem.h
@@ -182,6 +182,8 @@ void mem_add_bios();
 void mem_init();
 void mem_resize();
 
+void mem_set_704kb();
+
 void flushmmucache();
 void flushmmucache_nopc();
 void flushmmucache_cr3();
diff --git a/src/pc.c b/src/pc.c
index c29f07b..faeaa1a 100644
--- a/src/pc.c
+++ b/src/pc.c
@@ -417,6 +417,8 @@ void resetpchard()
         disc_load(1, discfns[1]);
 
         model_init();
+        if (!AT)
+                mem_set_704kb();
         mouse_emu_init();
         video_init();
         speaker_init();