diff --git a/portable/SDCC/Z180/port.c b/portable/ThirdParty/Z88DK/Z180/port.c
similarity index 100%
rename from portable/SDCC/Z180/port.c
rename to portable/ThirdParty/Z88DK/Z180/port.c
diff --git a/portable/SDCC/Z180/portmacro.h b/portable/ThirdParty/Z88DK/Z180/portmacro.h
similarity index 100%
rename from portable/SDCC/Z180/portmacro.h
rename to portable/ThirdParty/Z88DK/Z180/portmacro.h
diff --git a/portable/ThirdParty/Z88DK/Z180/readme.md b/portable/ThirdParty/Z88DK/Z180/readme.md
new file mode 100644
index 000000000..1f558ee82
--- /dev/null
+++ b/portable/ThirdParty/Z88DK/Z180/readme.md
@@ -0,0 +1,13 @@
+<h1>z180 support</h1>
+
+Description
+-----------
+This PR establishes support for a Zilog z180 port, using the Programmable Reload Timer 1, configured at 256 Hz.
+
+Because of the generality of the z180, the address of the Interrupt Vector for PRT1 is configurable, and must be configured by the `crt0.asm` outside of this port. A configuration assumption has been made.
+
+The two compilers ([used by the z88dk](https://github.com/z88dk/z88dk)) are supported. The sccz80 compiler and the sdcc compiler. The PR is located under Z88dk.
+
+Background
+-----------
+This PR is based on running code for the [SC130](https://smallcomputercentral.wordpress.com/sc130-z180-motherboard/)/[SC131](https://smallcomputercentral.wordpress.com/sc131-z180-pocket-computer/) and [YAZ180](https://github.com/feilipu/yaz180) platforms, and is maintained by the z88dk team in this [z88dk-libraries](https://github.com/feilipu/z88dk-libraries/tree/master/freertos) repository.
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