diff --git a/libb/6502.b b/libb/6502.b
index 234b283b..dc19cd61 100644
--- a/libb/6502.b
+++ b/libb/6502.b
@@ -40,11 +40,30 @@ realloc(ptr, size) {
    with the `divmod` test
 */
 _div(a, b) {
-    auto d;
+    auto d, sign;
+    sign = 0;
+    if (a < 0) {
+        sign = !sign;
+        a = -a;
+    }
+    if (b < 0) {
+        sign = !sign;
+        b = -a;
+    }
+
     d = 0; while(a >= b) {
         a = a - b;
         d++;
     }
+    if (sign) d = -d;
+    return (d);
+}
+_udiv(a, b) {
+    auto d;
+    d = 0; while(a >= b | a < 0) {
+        a = a - b;
+        d++;
+    }
     return (d);
 }
 
@@ -58,18 +77,29 @@ _rem (a, b) {
     }
     return (a);
 }
+_urem(a, b) {
+    auto d;
+    while(a >= b | a < 0) {
+        a = a - b;
+    }
+    return (a);
+}
 
 printn(n, b, sign) {
-    auto a, c, d;
+    auto a, c, d, __div, __rem;
+
+    /* use correct div/rem based on sign */
+    __div = sign ? &_div : &_udiv;
+    __rem = sign ? &_rem : &_urem;
 
     if (sign & n < 0) {
         putchar('-');
         n = -n;
     }
 
-    if(a=_div(n, b)) /* assignment, not test for equality */
+    if(a=__div(n, b)) /* assignment, not test for equality */
         printn(a, b, 0); /* recursive */
-    c = _rem(n,b) + '0';
+    c = __rem(n,b) + '0';
     if (c > '9') c += 7;
     putchar(c);
 }
@@ -106,7 +136,7 @@ printf(str, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15) {
                 while (c = char(*arg, j++)) {
                     putchar(c);
                 }
-            } else if (c == 'z') { /* hack for %zu */
+            } else if ((c == 'z') | (c == 'l')) { /* hack for %zu %lu, % */
                 c = '%';
                 goto while_end;
             } else {
diff --git a/tests.json b/tests.json
index ab054f6f..cd4807ec 100644
--- a/tests.json
+++ b/tests.json
@@ -830,14 +830,14 @@
             "comment": ""
         },
         "uxn": {
-            "expected_stdout": "69\n1000000\n123456789987654321\n",
+            "expected_stdout": "69\n16960\n64177\n",
             "state": "Enabled",
-            "comment": ""
+            "comment": "Since uxn word size is 16 we expect such big literals to get truncated accordingly. 1000000 == 0xf4240 -> 16960 == 0x4240. 123456789987654321 == 0x1b69b4be052fab1 -> 64177 == 0xfab1"
         },
         "6502": {
-            "expected_stdout": "69\r\n1000000\r\n123456789987654321\r\n",
+            "expected_stdout": "69\r\n16960\r\n64177\r\n",
             "state": "Enabled",
-            "comment": ""
+            "comment": "Since 6502 word size is 16 we expect such big literals to get truncated accordingly. 1000000 == 0xf4240 -> 16960 == 0x4240. 123456789987654321 == 0x1b69b4be052fab1 -> 64177 == 0xfab1"
         },
         "gas-x86_64-darwin": {
             "expected_stdout": "69\n1000000\n123456789987654321\n",