Texas Instruments TI89 Developer Guide - Page 972

930 Appendix A: System Routines - Operating System FL_getHardwareParmBlock Declaration: Category(ies): Description: Inputs: Outputs: HARDWARE_PARM_BLOCK * FL_getHardwareParmBlock (void) Operating System Get a pointer to the hardware parameter block. None The hardware parameter block contains a description of the calculator hardware. typedef struct { unsigned short len; // length of parameter block unsigned long hardwareID; // 1 = TI-92 Plus, 3 = TI-89 unsigned long hardwareRevision; // hardware revision number unsigned long bootMajor; // boot code version number unsigned long bootRevision; // boot code revision number unsigned long bootBuild; // boot code build number unsigned long gateArray; // gate array version number unsigned long physDisplayBitsWide; // display width unsigned long physDisplayBitsTall; // display height unsigned long LCDBitsWide; // visible display width unsigned long LCDBitsTall; // visible display height } HARDWARE_PARM_BLOCK; The TI-89 / TI-92 Plus allocate the same amount of memory for the LCD. However, the TI-89 cannot display as much as the TI-92 Plus. LCDBitsWide and LCDBitsTall reflect how much of LCD memory the calculator user can see. Note: Some fields of the HARDWARE_PARM_BLOCK are not available in earlier versions of the calculator. The fields up through bootBuild are available in all boot code versions. It is important to check the value of len before accessing any values after bootBuild. See OFFSETOF in the example below to learn how to determine if a particular field is present. Assumptions: You cannot change any values in the parameter block. The pointer returned by this routine points directly to a parameter block in ROM. Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: Not applicable. (continued) TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001