Commit with some sample code and a working project folder + makefile.

.gitignore

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+#build build, go away...
+build/
+
+#swap,tmp,etc
+*.swp
+*.swo
+*~

Makefile

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+# Makefile
+SRC_DIR = src
+BUILD_DIR = build
+BOOTLOADER_SRC = $(SRC_DIR)/boot.asm
+BOOTLOADER_IMG = $(BUILD_DIR)/boot.img
+
+QEMU = qemu-system-i386
+
+all: $(BOOTLOADER_IMG)
+
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+
+$(BOOTLOADER_IMG): $(BOOTLOADER_SRC) | $(BUILD_DIR)
+	nasm -f bin $(BOOTLOADER_SRC) -o $(BOOTLOADER_IMG)
+
+run: all
+	$(QEMU) -drive format=raw,file=$(BOOTLOADER_IMG) -display gtk
+
+clean:
+	rm -rf $(BUILD_DIR)
+

src/boot.asm

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+; boot.asm - simple boot sector
+BITS 16
+ORG 0x7C00
+
+start:
+    mov ah, 0x0E
+    mov al, 'H'
+    int 0x10
+    mov al, 'i'
+    int 0x10
+
+    jmp $
+
+times 510 - ($ - $$) db 0
+dw 0xAA55