CD-ROM images are now working correctly again;

Fixed all the reported bugs regarding the Settings dialog;
MIDI out device is now no longer reset to 0 after hard reset;
Removed all vestiges of the old disk activity flash;
The configuration file is no longer saved when it shouldn't be;
Redone the status bar icon updating so it is only done in win.c;
Made sure all variables in ibm.h are extern;
A lot of other bugfixes;
Added Mouse Systems Mouse emulation (patch from TheCollector1995);
Added IBM PS/1 Model 2133 (486) emulation (patch from TheCollector1995);
Tweaked the CPU dynamic recompiler cycle periods - 486SX 33 and 486DX 33 now work;
Increased compatibility with configuration files from before the previous commit.

src/mem.c

@@ -46,8 +46,23 @@ mem_mapping_t bios_mapping[8];
 mem_mapping_t bios_high_mapping[8];
 static mem_mapping_t romext_mapping;
 
+uint8_t *ram;
+uint32_t rammask;
+
+uint32_t pccache;
+uint8_t *pccache2;
+
+int readlookup[256],readlookupp[256];
+uintptr_t *readlookup2;
+int readlnext;
+int writelookup[256],writelookupp[256];
+uintptr_t *writelookup2;
+int writelnext;
+
 int shadowbios,shadowbios_write;
 
+int mem_a20_state;
+
 static unsigned char isram[0x10000];
 
 static uint8_t ff_array[0x1000];
@@ -467,6 +482,14 @@ int loadbios()
                 biosmask = 0x1ffff;
                 return 1;
 
+                case ROM_IBMPS1_2133:
+                f = romfopen(L"roms/ibmps1_2133/PS1_2133_52G2974_ROM.bin", L"rb");
+                if (!f) break;
+                fread(rom, 0x20000, 1, f);                
+                fclose(f);
+                biosmask = 0x1ffff;
+                return 1;
+
                 case ROM_DESKPRO_386:
                 f=romfopen(L"roms/deskpro386/109592-005.U11.bin",L"rb");
                 ff=romfopen(L"roms/deskpro386/109591-005.U13.bin",L"rb");