[04/fill] Done with Automated screen fill

Updated NOTES

NOTES.md

@@ -8,3 +8,33 @@ RAM64
 
 RAM512
 : I used the premise of the previous note and decided to index the RAM64 moduls by the LSB instead of the customary MSB. It still works :metal:
+
+Fill.asm
+: Figured out that my RAM16K implementation was wrong while working on this. The rough pseudocode would be:
+    ```c
+    int r0=*screen;
+    while(true) {
+      int color = 0;
+      if (*kbd > 0) {
+        color = -1;
+      }
+
+      // This sets an entire row of pixels to color
+      // each row has 32 registers (512/16) that we set to color
+      *r0 = color;
+      *r0+1 = color;
+      *r0+2 = color;
+      *r0+3 = color;
+      *r0+4 = color;
+      // and so on
+      *r0+31 = color;
+
+      // if we are on the last row
+      if (r0-24575 <=0) {
+        r0 = *screen;
+      }
+    }
+
+    ```
+  So every "cycle" of the loop, we are coloring an entire row. The row is decided by R0, which is set to @SCREEN at the start. So if you press a key while we are on the middle of the loop (say 120th row), everything from that row onwards would get painted in black, and then the loop resets r0=*screen once we cross the limits. The next iteration of the loop then starts filling the white pixels we'd left in the previous iteration. I kept the smallest paint unit as the row, but it doesn't really matter that much. The only difference is that I'm reading kbd a total of 256 times to paint the screen. Reading once per register also would work, and reading once per "screenfill" would also work. But that changes the 'delay' b/w your keyboard press and the screen fill start. I thought per row was a good compromise.
+  **assembly**: Since our assembly doesn't have any functions, writing Assembly is much tougher than I thought it would be. All state is global, there are no functions, and you can only jump using goto.

projects/04/fill/Fill.asm

@@ -11,10 +11,13 @@
 // "white" in every pixel;
 // the screen should remain fully clear as long as no key is pressed.
 
-// Set i to 255
+// See NOTES.md for details on how this works
-@255
+
+(PROGRAM_START)
+// Set R0 to SCREEN
+@SCREEN
 D=A
-@i
+@R0
 M=D
 
 (KEYBOARD_LOOP)
@@ -36,47 +39,107 @@ M=D
 
 // At this point @color = 0|-1 depending on whether a key is pressed
 
-// This is adapted from manual-fill.asm
-
-
 // coloring code goes here
 
+// Read color to D
 
 @color
 D=M
 
-@SCREEN
+// Load the value in R0 to A
+@R0
+A=M
+// And off we go hunting
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
+M=D
+A=A+1
 M=D
-
 
 // Keyboard Loop ending
 
-// Reduce i by 1
+// Bump A by 1 and write it to R0
-@i
+A=A+1
-M=M-1
-
-// Jump to ENDIF if @i>0
-@i
-D=M
-@ENDIF
-D;JGT
-
-// Here i==0, so we reset it to 255
-@255
 D=A
-@i
+@R0
 M=D
 
+// If R0-24575 <= 0, then jump to program start
+@24575
+D=A
+@R0
+D=M-D // (D=R0-24575)
+@ENDIF
+D;JLE
+
+// Here, R1 is negative
+// set R0=@SCREEN and let the loop continue
+@SCREEN
+D=A
+@R0
+M=D
+
+
 (ENDIF)
 
-
+// OTHERWISE, we just restart the keyboard loop
 @KEYBOARD_LOOP
 0;JMP
-
-
-// @WRITE_COMPLETE_ROW
-// 0;JMP
-
-(END)
-@END
-0;JMP

projects/04/fill/Fill.hack

@@ -1,8 +1,8 @@
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@@ -11,188 +11,88 @@
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projects/04/fill/FillAutomatic.out

@@ -1,3 +1,4 @@
 |RAM[16384]|RAM[17648]|RAM[18349]|RAM[19444]|RAM[20771]|RAM[21031]|RAM[22596]|RAM[23754]|RAM[24575]|
 |       0  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |
-|      -1  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |
+|      -1  |      -1  |      -1  |      -1  |      -1  |      -1  |      -1  |      -1  |      -1  |
+|       0  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |       0  |