From 3337e122cc2367b5939cf30869ea7dba854a90bf Mon Sep 17 00:00:00 2001
From: Perry Kivolowitz <perry@kivolowitz.com>
Date: Fri, 13 Jan 2023 08:18:09 -0600
Subject: [PATCH] added 68K results

---
 .vscode/settings.json      | 28 +++++++++++++++-------------
 section_3/endian/README.md | 28 ++++++++++++++++++++++------
 section_3/endian/main.c    | 25 +++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 19 deletions(-)
 create mode 100644 section_3/endian/main.c

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 4861e92..57d7de3 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -33,19 +33,21 @@
 		"MD024":false
     },
     "cSpell.ignoreWords": [
-		"Rypo",
-		"dless",
-		"dmore",
-		"foov",
-		"ndless",
-		"ndmore",
-		"onditionally",
-		"onsole",
-		"rotypo",
-		"rwtypo",
-		"slen",
-		"ssize"
-	],
+        "Athanasios",
+        "Pavlidis",
+        "Rypo",
+        "dless",
+        "dmore",
+        "foov",
+        "ndless",
+        "ndmore",
+        "onditionally",
+        "onsole",
+        "rotypo",
+        "rwtypo",
+        "slen",
+        "ssize"
+    ],
 	"files.associations": {
 		"ostream": "cpp"
 	}
diff --git a/section_3/endian/README.md b/section_3/endian/README.md
index 5c1e89a..1bd1b32 100644
--- a/section_3/endian/README.md
+++ b/section_3/endian/README.md
@@ -156,8 +156,25 @@ on a little endian machine, it is the first byte in the long in memory.
 
 ## Output on a big endian machine
 
-We tried and tried but could not get anyone to run this code on a
-big-endian machine.
+We tried and tried to find a kind soul to run the above program on a
+big-endian machine. Redditor Athanasios Pavlidis ran a C version of the
+code on both an Amiga A4000/MC68040 and an Amiga A3000/MC68030. The
+results were:
+
+```text
+Endianness of this computer:
+i16: 0123
+i32: 01234567
+i64: 89abcdef01234567
+```
+
+Notice the values for `i16` and `i32` match the right hand column above.
+The value for `i64` is borked in that we specified it in the C code as a
+`long`. We then tried specifying the `long` as a `long long`. Apparently
+there is little support for 64 bit numbers on this ancient but
+venerable architecture.
+
+Athanasios Pavlidis has our appreciation and thanks.
 
 ## Can't the ARM swing both ways?
 
@@ -169,7 +186,8 @@ install the big-endian version of the toolchain.
 Here is a quote from Wikipedia:
 
 ```text
-ARM, C-Sky, and RISC-V have no relevant big-endian deployments, and can be considered little-endian in practice.
+ARM, C-Sky, and RISC-V have no relevant big-endian deployments, and can
+be considered little-endian in practice.
 ```
 
 ## What is Intel?
@@ -178,6 +196,4 @@ The common Intel processors are also little-endian.
 
 ## So what's big-endian?
 
-The Motorola 68K family - we reached out to the Amiga user community in
-the hopes that someone would run the code, but no one has and this makes
-us sad. :(
+IBM mainframes and the Motorola 68K family come to mind. See above.
diff --git a/section_3/endian/main.c b/section_3/endian/main.c
new file mode 100644
index 0000000..ab4df2b
--- /dev/null
+++ b/section_3/endian/main.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+void Dump(void * i, int length) {
+    unsigned char * ptr = (unsigned char *) i;
+
+    for (int counter = 0; counter < length; counter++) {
+        printf("%02x", *(ptr++));
+    }
+    printf("\n");
+}
+
+int main() {
+	unsigned short i16 = 0x0123;
+	unsigned int   i32 = 0x01234567;
+	unsigned long  i64 = 0x0123456789ABCDEF;
+
+    printf("Endianness of this computer:\n");
+    printf("i16: ");
+    Dump((void *) &i16, 2);
+	printf("i32: ");
+	Dump((void *)&i32, 4);
+	printf("i64: ");
+	Dump((void *)&i64, 8);
+    return 0;
+}
\ No newline at end of file