Rename rdos.sys to rdos.bin

*.sys is meant for DOS-like driver binaries. I actually have a flat
binary with a specific load offset.

Makefile

@@ -1,7 +1,7 @@
 FLOPPY = 360
 
 PROGRAMS = $(patsubst %.asm,%.com,$(wildcard programs/*.asm))
-DISTFILES = rdos.sys $(PROGRAMS)
+DISTFILES = rdos.bin $(PROGRAMS)
 ROMS =
 
 QEMU_ARCH = $(shell uname -m)
@@ -30,7 +30,7 @@ endif
 
 default: fdimage.img
 
-rdos.sys: kernel/*.asm lib/*.asm
+rdos.bin: kernel/*.asm lib/*.asm
 	$(NASM) $(NASM_ARGS) -o $@ -I kernel kernel/main.asm
 
 debug.rom: debug/*.asm lib/*.asm

boot/fat.asm

@@ -235,7 +235,7 @@ error:
   int 0x19
 
 kernel_name:
-  db "RDOS    SYS"
+  db "RDOS    BIN"
 
 times (0x1FE - ($-$$)) db 0