diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index 0608f896d..abba832f0 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -2,7 +2,7 @@
 TODO
 ====
 
-- fix the invalid assembly generation problem (invalid_assembly.p8)
+- fix the invalid assembly generation problem for several direct memory operations (invalid_assembly.p8 / todo.p8)
 
 
 - implement the asm for bitshift on arrays (last missing assembly code generation)
diff --git a/examples/invalid_assembly.p8 b/examples/invalid_assembly.p8
index eb3d8764c..d9fb7c00a 100644
--- a/examples/invalid_assembly.p8
+++ b/examples/invalid_assembly.p8
@@ -58,7 +58,7 @@ main {
 
     sub plot(uword px, ubyte py, ubyte color) {
         uword addr = 320
-        A=@(addr)           ; TODO invalid assemlby generated    lda (addr),y    something to do with zeropage allocation????
+        A=@(addr)           ; TODO invalid assemlby generated    lda (addr),y    something to do with zeropage allocation???? or simply direct memory write/read wrong translations?
         @(addr) = A
     }
 
diff --git a/examples/test.p8 b/examples/test.p8
index bce031b8f..f3428164d 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -4,21 +4,84 @@
 
 
 main {
-    uword[2] array1 = 1
-
-
     sub start() {
         uword addr = $c000
-        &uword addr2 = $c100
+        &ubyte addr2 = $c100
 
-        ; not sure if these are okay:
+        uword border = $d020
+        &ubyte borderptr = $d020
+;        @($d020) = 0
+;        @(border) = 1
+;        borderptr=2
+
+;        @($d020)+=9
+;        @($d020)-=9
+        @(border)+=9        ; TODO fix wrong assembly code
+        @(border)-=9        ; TODO fix wrong assembly code
+;        borderptr+=9
+;        borderptr-=9
+
+        @($c000) |= 8       ; ok?
+        addr2 |= 8          ; ok?
+        @(addr) |= 8        ; ok?
+
+
+
+        ; TODO Verify memory augmented assignment operations.
         addr2 =  0
-        addr2 |= 128
+        addr2 |= 8
+        addr2 |= 2
+        addr2 |= 2
+
+        c64scr.print_ub(addr2)
+        c64.CHROUT('\n')
+        if(addr2 != 10) {
+            c64scr.print("error1\n")
+        }
         addr2 += 1
+        addr2 *=10
+        c64scr.print_ub(addr2)
+        c64.CHROUT('\n')
+        if(addr2 != 110) {
+            c64scr.print("error2\n")
+        }
+
+        @($c000) = 0
+        @($c000) |= 8      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        @($c000) |= 2      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        @($c000) |= 2      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        c64scr.print_ub( @($c000) )
+        c64.CHROUT('\n')
+        if(@($c000) != 10) {
+            c64scr.print("error3\n")
+        }
+
+        @($c000) += 1      ; TODO fix result of memory += 1
+        @($c000) *=10
+        c64scr.print_ub( @($c000) )
+        c64.CHROUT('\n')
+        if(@($c000) != 110) {
+            c64scr.print("error4\n")
+        }
+
 
         @(addr) = 0
-        @(addr) |= 128      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        @(addr) |= 8      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        @(addr) |= 2      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        @(addr) |= 2      ; TODO FIX result of memory-OR/XOR and probably AND as well
+        c64scr.print_ub( @(addr) )
+        c64.CHROUT('\n')
+        if(@(addr) != 10) {
+            c64scr.print("error5\n")
+        }
+
         @(addr) += 1      ; TODO fix result of memory += 1
+        @(addr) *= 10
+        c64scr.print_ub( @(addr) )
+        c64.CHROUT('\n')
+        if(@(addr) != 110) {
+            c64scr.print("error6\n")
+        }
 
     }
 }