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diff --git a/src/gpu.h b/src/gpu.h
index 97ba4b3..47ec012 100644
--- a/src/gpu.h
+++ b/src/gpu.h
@@ -13,26 +13,30 @@
 
 void GPUInit(void);
 void GPUReset(void);
-void GPUExec(int32);
+void GPUExec(int32_t);
 void GPUDone(void);
 void GPUUpdateRegisterBanks(void);
 void GPUHandleIRQs(void);
 void GPUSetIRQLine(int irqline, int state);
 
-uint8 GPUReadByte(uint32 offset, uint32 who = UNKNOWN);
-uint16 GPUReadWord(uint32 offset, uint32 who = UNKNOWN);
-uint32 GPUReadLong(uint32 offset, uint32 who = UNKNOWN);
-void GPUWriteByte(uint32 offset, uint8 data, uint32 who = UNKNOWN);
-void GPUWriteWord(uint32 offset, uint16 data, uint32 who = UNKNOWN);
-void GPUWriteLong(uint32 offset, uint32 data, uint32 who = UNKNOWN);
+uint8_t GPUReadByte(uint32_t offset, uint32_t who = UNKNOWN);
+uint16_t GPUReadWord(uint32_t offset, uint32_t who = UNKNOWN);
+uint32_t GPUReadLong(uint32_t offset, uint32_t who = UNKNOWN);
+void GPUWriteByte(uint32_t offset, uint8_t data, uint32_t who = UNKNOWN);
+void GPUWriteWord(uint32_t offset, uint16_t data, uint32_t who = UNKNOWN);
+void GPUWriteLong(uint32_t offset, uint32_t data, uint32_t who = UNKNOWN);
 
-uint32 GPUGetPC(void);
+uint32_t GPUGetPC(void);
 void GPUReleaseTimeslice(void);
 void GPUResetStats(void);
-uint32 GPUReadPC(void);
+uint32_t GPUReadPC(void);
 
 // GPU interrupt numbers (from $F00100, bits 4-8)
 
 enum { GPUIRQ_CPU = 0, GPUIRQ_DSP, GPUIRQ_TIMER, GPUIRQ_OBJECT, GPUIRQ_BLITTER };
 
+// Exported vars
+
+extern uint32_t gpu_reg_bank_0[], gpu_reg_bank_1[];
+
 #endif	// __GPU_H__