NESizm and Prizoop — Now on fx-CG100/Graph Math+!
Posté le 14/01/2026 15:05
The day has finally come: NESizm and Prizoop are now available on the latest Classwiz calculators fx-CG100 and Graph Math+, with the same features and ROM support as in fx-CG50/Graph 90+E!
ROMs used: MANTLE.NES, Pokémon Red Version
A few years back, Thomas Williamson released
NESizm and
Prizoop that allow users to load their favorite NES and Gameboy (Color) ROMs into a Prizm fx-CG calculator. They unfortunately do not work on the latest calculators as Casio removed the ability to run add-ins natively.
As a remedy, Planète Casio released
MPM to restore the add-ins, but at the current stage it only supports add-ins that are either compiled under fxSDK/gint, or adapted by directly mapping Graph Math+ address to each corresponding fx-CG50 syscall.
The MPM version of both NESizm and Prizoop released today use the one-to-one mapping approach, and thus only supports fx-CG100/Graph Math+ with
OS 02.00.0202/02.00.2202. Any other OS version will lead to a system error as the addresses are different for each version.
I may update both emulator add-ins if MPM is updated with latest OS support, but finding correct addresses takes quite a lot of repetitive searches and I have to do so again every time the OS/MPM updates. I was able to quickly determine them thanks to Parisse's (developer of KhiCAS) syscall script and Lephe's fxos tools. Ultimately, they need to be ported to fxSDK/gint with rewrite that removes dependencies to legacy syscalls, but the effort is much larger due to API differences between fxSDK/gint and PrizmSDK.
Both emulators are attached to this thread. Have fun!
Fichier joint
Citer : Posté le 14/01/2026 15:20 | #
Incredible work! Can you list all the syscalls you had to replace? Ultimately MPM's loader mpm.bin will take care of intercepting syscalls which will work around the need to rebuild the applications all the time.
Citer : Posté le 14/01/2026 15:54 | #
Incredible work! Can you list all the syscalls you had to replace? Ultimately MPM's loader mpm.bin will take care of intercepting syscalls which will work around the need to rebuild the applications all the time.
Bdisp_DefineDMARange // 0x01A3, 0x800742a0
Bdisp_WriteDDRegister3_bit7 // 0x01A6, 0x800743de
Bdisp_PutDisp_DD_stripe // 0x0260, 0x8007a2da
Bdisp_AreaClr // 0x02B2, 0x8007bbcc
Bdisp_Fill_VRAM // 0x0275, 0x8007a6ca
Bdisp_EnableColor // 0x0921, 0x80115d50
Bfile_GetBlockAddress // 0x1DAA, 0x80333cf2
SaveVRAM_1 // 0x1E62, 0x80251824
LoadVRAM_1 // 0x1E63, 0x80251838
CMT_Delay_micros // 0x11D6, 0x80230b4e
MCS_WriteItem // 0x151A, 0x80259388
MCS_CreateDirectory // 0x154B, 0x8025b166
MCSGetDlen2 // 0x1562, 0x8025c392
MCSGetData1 // 0x1563, 0x8025c3f8
RTC_GetTime // 0x02C0, 0x8007cbbc
Serial_IsOpen // 0x1BC6, 0x8030a89e
Serial_Open // 0x1BB7, 0x8030a358
Serial_Close // 0x1BB8, 0x8030a3f6
Serial_PollTX // 0x1BC0, 0x8030a6ea
Serial_PollRX // 0x1BBF, 0x8030a6d6
Serial_Read // 0x1BBA, 0x8030a4ee
Serial_Write // 0x1BBE, 0x8030a678
Citer : Posté le 14/01/2026 18:58 | #
How do you manage the interception of the syscalls by mpm.bin ?
For SquishIt, I had to call the GetKeyWait syscall and then used a direct call to the address
uintptr_t GetKeyWaitOS_Address = 0x802382fe;
typedef int (*GetKeyWaitOS_func_t)(int* column, int* row, int type_of_waiting, int timeout_period, int menu, unsigned short* keycode);
int SquishIt_GetKeyWait( unsigned int keycode_to_check ) {
GetKeyWaitOS_func_t GetKeyWaitOS = (GetKeyWaitOS_func_t) GetKeyWaitOS_Address;
int retour;
int column, row;
int target_column, target_row;
unsigned short keycode_returned;
if (keycode_to_check==KEY_EXIT) { target_column = 0x06; target_row = 0x09; }
else return 0;
retour = GetKeyWaitOS( &column, &row, 1, 0, 0, &keycode_returned );
if (retour == 1 && target_column==column && target_row==row) return 1;
else return 0;
}
It works great but is a kind of pain in the a__ to code such trick.
(Had to do this cause this is called when already in a World Switch and hence the keyboard driver of gint is Off. So I needed to call directly the OS).
Maybe is there a better and simpler way to handle this.
Citer : Posté le 14/01/2026 19:42 | #
I adopt this kind of function cast from KhiCAS syscalls.c:
int (*ptr)(int*column, int*row, int type_of_waiting, int timeout_period, int menu, unsigned short*keycode) = 0x802382fe;
return ptr(column,row,type_of_waiting,timeout_period,menu,keycode);
}
You can omit the parameter names for ptr declaration (i.e. int (*ptr)(int*, int*, int, int, int, unsigned short*)) but simply copying the whole set is faster.
Citer : Posté le 14/01/2026 20:56 | #
Ok so you are basically doing like me, your are directly striking the function address.
Thanks