[NISTC_DIO_IN_REG]              = { 0, 0 }, /* Unknown */
        [NISTC_G0_HW_SAVE_REG]          = { 0x110, 4 },
        [NISTC_G1_HW_SAVE_REG]          = { 0x114, 4 },
-       [G_Save_Register(0)]            = { 0x118, 4 },
-       [G_Save_Register(1)]            = { 0x11c, 4 },
+       [NISTC_G0_SAVE_REG]             = { 0x118, 4 },
+       [NISTC_G1_SAVE_REG]             = { 0x11c, 4 },
        [AO_UI_Save_Registers]          = { 0x120, 4 },
        [AO_BC_Save_Registers]          = { 0x124, 4 },
        [AO_UC_Save_Registers]          = { 0x128, 4 },
        [NITIO_G1_CMD]          = { NISTC_G1_CMD_REG, 2 },
        [NITIO_G0_HW_SAVE]      = { NISTC_G0_HW_SAVE_REG, 4 },
        [NITIO_G1_HW_SAVE]      = { NISTC_G1_HW_SAVE_REG, 4 },
-       [NITIO_G0_SW_SAVE]      = { G_Save_Register(0), 4 },
-       [NITIO_G1_SW_SAVE]      = { G_Save_Register(1), 4 },
+       [NITIO_G0_SW_SAVE]      = { NISTC_G0_SAVE_REG, 4 },
+       [NITIO_G1_SW_SAVE]      = { NISTC_G1_SAVE_REG, 4 },
        [NITIO_G0_MODE]         = { NISTC_G0_MODE_REG, 2 },
        [NITIO_G1_MODE]         = { NISTC_G1_MODE_REG, 2 },
        [NITIO_G0_LOADA]        = { NISTC_G0_LOADA_REG, 4 },
 
 #define NISTC_G0_HW_SAVE_REG           8
 #define NISTC_G1_HW_SAVE_REG           10
 
+#define NISTC_G0_SAVE_REG              12
+#define NISTC_G1_SAVE_REG              14
+
 #define AI_SI_Save_Registers           64
 #define AI_SC_Save_Registers           66
 
 #define AO_BC_Save_Registers           18
 #define AO_UC_Save_Registers           20
 
-#define G_Save_Register(a)             (12+(a)*2)
-#define G_Save_Register_High(a)                (12+(a)*2)
-#define G_Save_Register_Low(a)         (13+(a)*2)
-
 /* command register */
 #define G_Disarm_Copy                  _bit15  /* strobe */
 #define G_Save_Trace_Copy              _bit14