diff --git a/src/uxn.c b/src/uxn.c
index 7778aef..c3a7f1a 100644
--- a/src/uxn.c
+++ b/src/uxn.c
@@ -108,7 +108,7 @@ err:
 /* clang-format on */
 
 int
-uxn_boot(Uxn *u, Stack *wst, Stack *rst, Uint8 *memory)
+uxn_boot(Uxn *u, Uint8 *ram, Uint8 *dev, Stack *wst, Stack *rst)
 {
 	Uint32 i;
 	char *cptr = (char *)u;
@@ -116,7 +116,7 @@ uxn_boot(Uxn *u, Stack *wst, Stack *rst, Uint8 *memory)
 		cptr[i] = 0x00;
 	u->wst = wst;
 	u->rst = rst;
-	u->ram = memory;
+	u->ram = ram;
 	return 1;
 }
 
diff --git a/src/uxn.h b/src/uxn.h
index 2359c47..3be5990 100644
--- a/src/uxn.h
+++ b/src/uxn.h
@@ -16,6 +16,7 @@ typedef signed short Sint16;
 typedef unsigned int Uint32;
 
 #define PAGE_PROGRAM 0x0100
+#define PAGE_DEV 0xfd00
 #define PAGE_WST 0xfe00
 #define PAGE_RST 0xff00
 
@@ -45,7 +46,7 @@ typedef struct Uxn {
 	Device dev[16];
 } Uxn;
 
-int uxn_boot(Uxn *u, Stack *wst, Stack *rst, Uint8 *memory);
+int uxn_boot(Uxn *u, Uint8 *ram, Uint8 *dev, Stack *wst, Stack *rst);
 int uxn_eval(Uxn *u, Uint16 pc);
 int uxn_halt(Uxn *u, Uint8 error, Uint16 addr);
 Device *uxn_port(Uxn *u, Uint8 id, Uint8 (*deifn)(Device *, Uint8), void (*deofn)(Device *, Uint8));
diff --git a/src/uxncli.c b/src/uxncli.c
index 8966ea4..ff82b69 100644
--- a/src/uxncli.c
+++ b/src/uxncli.c
@@ -143,7 +143,7 @@ main(int argc, char **argv)
 
 	shadow = (Uint8 *)calloc(0xffff, sizeof(Uint8));
 	memory = (Uint8 *)calloc(0xffff, sizeof(Uint8));
-	if(!uxn_boot(&u, (Stack *)(shadow + PAGE_WST), (Stack *)(shadow + PAGE_RST), memory))
+	if(!uxn_boot(&u, memory, shadow + PAGE_DEV, (Stack *)(shadow + PAGE_WST), (Stack *)(shadow + PAGE_RST)))
 		return error("Boot", "Failed");
 
 	/* system   */ devsystem = uxn_port(&u, 0x0, system_dei, system_deo);
diff --git a/src/uxnemu.c b/src/uxnemu.c
index 40881d2..f50dce3 100644
--- a/src/uxnemu.c
+++ b/src/uxnemu.c
@@ -278,9 +278,9 @@ start(Uxn *u, char *rom)
 	memory = (Uint8 *)calloc(0xffff, sizeof(Uint8));
 	shadow = (Uint8 *)calloc(0xffff, sizeof(Uint8));
 
-	if(!uxn_boot(&hypervisor, (Stack *)(shadow + 0xfc00), (Stack *)(shadow + 0xfd00), shadow))
+	if(!uxn_boot(&hypervisor, shadow, shadow + PAGE_DEV, (Stack *)(shadow + 0xfb00), (Stack *)(shadow + 0xfc00)))
 		return error("Boot", "Failed to start uxn.");
-	if(!uxn_boot(u, (Stack *)(shadow + PAGE_WST), (Stack *)(shadow + PAGE_RST), memory))
+	if(!uxn_boot(u, memory, shadow + PAGE_DEV, (Stack *)(shadow + PAGE_WST), (Stack *)(shadow + PAGE_RST)))
 		return error("Boot", "Failed to start uxn.");
 	if(!load(&hypervisor, "hypervisor.rom"))
 		error("Hypervisor", "No debugger found.");