diff --git a/src/mem.c b/src/mem.c
index 739d16d..6464873 100644
--- a/src/mem.c
+++ b/src/mem.c
@@ -2313,10 +2313,10 @@ void mem_init()
 
         memset(_mem_state, 0, sizeof(_mem_state));
 
-        mem_set_mem_state(0x000000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+        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(0x0c0000, 0x40000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
 
-        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);
+        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);
         if (mem_size > 1024)
         {
                 if (cpu_16bitbus && mem_size > 16256)
@@ -2414,10 +2414,10 @@ void mem_resize()
         
         memset(_mem_state, 0, sizeof(_mem_state));
 
-        mem_set_mem_state(0x000000, (mem_size > 640) ? 0xa0000 : mem_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
+        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(0x0c0000, 0x40000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
         
-        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);
+        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);
         if (mem_size > 1024)
         {
                 if (cpu_16bitbus && mem_size > 16256)
diff --git a/src/model.c b/src/model.c
index 5dfde71..55be58b 100644
--- a/src/model.c
+++ b/src/model.c
@@ -116,7 +116,7 @@ MODEL models[] =
         {"[8088] Atari PC3",              ROM_ATARIPC3,         "ataripc3",       { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   64,  640,  64,             xt_init, NULL},
         {"[8088] Compaq Portable Plus",   ROM_COMPAQ_PIP,       "compaq_pip",     { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                  128,  640,  64,     compaq_pip_init, NULL},
         {"[8088] DTK XT clone",           ROM_DTKXT,            "dtk",            { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   64,  640,  64,             xt_init, NULL},
-        {"[8088] Generic XT clone",       ROM_GENXT,            "genxt",          { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   64,  640,  64,             xt_init, NULL},
+        {"[8088] Generic XT clone",       ROM_GENXT,            "genxt",          { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   32,  704,  16,             xt_init, NULL},
         {"[8088] IBM PC",                 ROM_IBMPC,            "ibmpc",          { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   64,  640,  32,             xt_init, NULL},
         {"[8088] IBM PCjr",               ROM_IBMPCJR,          "ibmpcjr",        { {"",      cpus_pcjr},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_FIXED,                                                 128,  640,  64,           pcjr_init, &pcjr_device},
         {"[8088] IBM XT",                 ROM_IBMXT,            "ibmxt",          { {"",      cpus_8088},        {"",    NULL},         {"",      NULL}},        MODEL_GFX_NONE,                                                   64,  640,  64,             xt_init, NULL},