Implement 8-bit VRAM writes

src/core/PICA/gpu.cpp

@@ -7,6 +7,7 @@ using namespace Floats;
 
 GPU::GPU(Memory& mem) : mem(mem), renderer(*this, regs) {
 	vram = new u8[vramSize];
+	mem.setVRAM(vram); // Give the bus a pointer to our VRAM
 }
 
 void GPU::reset() {
@@ -256,7 +257,6 @@ void GPU::fireDMA(u32 dest, u32 source, u32 size) {
 		std::memcpy(&vram[dest - vramStart], &fcram[source - fcramStart], size);
 	} else {
 		printf("Non-trivially optimizable GPU DMA. Falling back to byte-by-byte transfer");
-		std::memcpy(&vram[dest - vramStart], mem.getReadPointer(source), size);
 
 		for (u32 i = 0; i < size; i++) {
 			mem.write8(dest + i, mem.read8(source + i));

src/core/memory.cpp

@@ -143,7 +143,15 @@ void Memory::write8(u32 vaddr, u8 value) {
 		*(u8*)(pointer + offset) = value;
 	}
 	else {
-		Helpers::panic("Unimplemented 8-bit write, addr: %08X, val: %02X", vaddr, value);
+		// VRAM write
+		if (vaddr >= VirtualAddrs::VramStart && vaddr < VirtualAddrs::VramStart + VirtualAddrs::VramSize) {
+			// TODO: Invalidate renderer caches here
+			vram[vaddr - VirtualAddrs::VramStart] = value;
+		} 
+
+		else {
+			Helpers::panic("Unimplemented 8-bit write, addr: %08X, val: %02X", vaddr, value);
+		}
 	}
 }