diff --git a/include/device.h b/include/device.h
new file mode 100644
index 000000000..37323e637
--- /dev/null
+++ b/include/device.h
@@ -0,0 +1,61 @@
+/*****************************************************************************/
+/* */
+/* device.h */
+/* */
+/* Device handling */
+/* */
+/* */
+/* */
+/* (C) 2012 Oliver Schmidt,
*/
+/* */
+/* */
+/* This software is provided 'as-is', without any expressed or implied */
+/* warranty. In no event will the authors be held liable for any damages */
+/* arising from the use of this software. */
+/* */
+/* Permission is granted to anyone to use this software for any purpose, */
+/* including commercial applications, and to alter it and redistribute it */
+/* freely, subject to the following restrictions: */
+/* */
+/* 1. The origin of this software must not be misrepresented; you must not */
+/* claim that you wrote the original software. If you use this software */
+/* in a product, an acknowledgment in the product documentation would be */
+/* appreciated but is not required. */
+/* 2. Altered source versions must be plainly marked as such, and must not */
+/* be misrepresented as being the original software. */
+/* 3. This notice may not be removed or altered from any source */
+/* distribution. */
+/* */
+/*****************************************************************************/
+
+
+
+#ifndef _DEVICE_H
+#define _DEVICE_H
+
+
+
+/*****************************************************************************/
+/* Data */
+/*****************************************************************************/
+
+
+
+#define INVALID_DEVICE 255
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+unsigned char getfirstdevice (void);
+
+unsigned char __fastcall__ getnextdevice (unsigned char device);
+
+
+
+/* End of device.h */
+#endif
diff --git a/libsrc/c128/Makefile b/libsrc/c128/Makefile
index f462ddf99..a6dc0f2b1 100644
--- a/libsrc/c128/Makefile
+++ b/libsrc/c128/Makefile
@@ -56,6 +56,7 @@ OBJS = _scrsize.o \
devnum.o \
fast.o \
get_tv.o \
+ getdevice.o \
joy_stddrv.o \
kbhit.o \
kernal.o \
diff --git a/libsrc/c128/getdevice.s b/libsrc/c128/getdevice.s
new file mode 100644
index 000000000..9ec2abe69
--- /dev/null
+++ b/libsrc/c128/getdevice.s
@@ -0,0 +1,67 @@
+;
+; Oliver Schmidt, 2012-09-04
+;
+; unsigned char getfirstdevice (void);
+; unsigned char __fastcall__ getnextdevice (unsigned char device);
+;
+
+ .export _getfirstdevice
+ .export _getnextdevice
+
+ .import isdisk
+ .import opencmdchannel
+ .import closecmdchannel
+ .importzp tmp2
+
+ .include "c128.inc"
+
+;------------------------------------------------------------------------------
+; _getfirstdevice
+
+_getfirstdevice:
+ lda #$FF
+ ; Fall through
+
+;------------------------------------------------------------------------------
+; _getnextdevice
+
+_getnextdevice:
+ tax
+next: inx
+ cpx #$FF
+ beq done
+
+; [open|close]cmdchannel already call isdisk internally but they
+; interpret a non-disk as a no-op while we need to interpret it
+; as an error here
+
+ jsr isdisk
+ bcs next
+
+; [open|close]cmdchannel don't call into the Kernal at all if they
+; only [in|de]crement the reference count of the shared cmdchannel
+; so we need to explicitly initialize ST here
+
+ lda #$00
+ sta ST
+
+ stx tmp2
+ jsr opencmdchannel
+ ldx tmp2
+ jsr closecmdchannel
+ ldx tmp2
+
+; As we had to reference ST above anyway we can as well do so
+; here too (instead of calling READST)
+
+ lda ST
+
+; Either the Kernal calls above were successfull or there was
+; already a cmdchannel to the device open - which is a pretty
+; good indication of its existence ;-)
+
+ bmi next
+
+done: txa
+ ldx #$00
+ rts
diff --git a/libsrc/c64/Makefile b/libsrc/c64/Makefile
index 4fb2af916..2c952b7c0 100644
--- a/libsrc/c64/Makefile
+++ b/libsrc/c64/Makefile
@@ -55,6 +55,7 @@ OBJS = _scrsize.o \
devnum.o \
get_ostype.o \
get_tv.o \
+ getdevice.o \
joy_stddrv.o \
kbhit.o \
kernal.o \
diff --git a/libsrc/c64/getdevice.s b/libsrc/c64/getdevice.s
new file mode 100644
index 000000000..90bf6ba47
--- /dev/null
+++ b/libsrc/c64/getdevice.s
@@ -0,0 +1,67 @@
+;
+; Oliver Schmidt, 2012-09-04
+;
+; unsigned char getfirstdevice (void);
+; unsigned char __fastcall__ getnextdevice (unsigned char device);
+;
+
+ .export _getfirstdevice
+ .export _getnextdevice
+
+ .import isdisk
+ .import opencmdchannel
+ .import closecmdchannel
+ .importzp tmp2
+
+ .include "c64.inc"
+
+;------------------------------------------------------------------------------
+; _getfirstdevice
+
+_getfirstdevice:
+ lda #$FF
+ ; Fall through
+
+;------------------------------------------------------------------------------
+; _getnextdevice
+
+_getnextdevice:
+ tax
+next: inx
+ cpx #$FF
+ beq done
+
+; [open|close]cmdchannel already call isdisk internally but they
+; interpret a non-disk as a no-op while we need to interpret it
+; as an error here
+
+ jsr isdisk
+ bcs next
+
+; [open|close]cmdchannel don't call into the Kernal at all if they
+; only [in|de]crement the reference count of the shared cmdchannel
+; so we need to explicitly initialize ST here
+
+ lda #$00
+ sta ST
+
+ stx tmp2
+ jsr opencmdchannel
+ ldx tmp2
+ jsr closecmdchannel
+ ldx tmp2
+
+; As we had to reference ST above anyway we can as well do so
+; here too (instead of calling READST)
+
+ lda ST
+
+; Either the Kernal calls above were successfull or there was
+; already a cmdchannel to the device open - which is a pretty
+; good indication of its existence ;-)
+
+ bmi next
+
+done: txa
+ ldx #$00
+ rts