Preliminary CoCo support

docs/api/coco-programming-guide.md

@@ -0,0 +1,15 @@
+[< back to index](../doc_index.md)
+
+### A note about Color Computer
+
+The `coco_rsdos` target creates binary files that can run on Tandy Color Computer running RS-DOS.
+
+The compiler output is a raw machine code file with the `.bin` extension, which then has to be put on a disk. 
+You can do it using `imgtool` from the [MAME project](https://www.mamedev.org/):
+
+    imgtool create coco_jvc_rsdos disk_image.dsk
+    imgtool put coco_jvc_rsdos disk_image.dsk compiler_output.bin CO.BIN
+
+The resulting file can then be loaded and ran using the following commands:
+
+    LOADM"CO":EXEC

docs/api/target-platforms.md

@@ -99,6 +99,9 @@ The compiler emits COM files.
 
 * `cpm_z80` – CP/M on Z80
 
+* `coco_rsdos` – Tandy Color Computer running RS-DOS. (very experimental)
+Read [the Color Computer programming guide](./coco-programming-guide.md) for more info.
+
 * `dos_com` – a COM file for DOS on IBM PC. (very experimental)
 
 * `x16_experimental` – Commander X16; very experimental,