Removed old negative behavior in putchar

src/boot/mbr.s

@@ -76,7 +76,7 @@ skip_bpb:
     ; base pointer to a location that's far
     ; enough from where the code for the BIOS
     ; is located
-    mov sp, 0x7c00
+    mov sp, 0x9000
     mov bp, sp
     sti
     call bios_cls

src/kernel/drivers/vga/screen.c

@@ -122,7 +122,7 @@ u16 putchar(char ch, u8 row, u8 col, char attr) {
     if (row >= MAX_ROWS) {
         return -2;
     }
-    u16 offset = (col >= 0 && row >= 0)? getOffset(row, col): getCursorOffset();
+    u16 offset = getOffset(row, col);
     switch (ch) {
         // Note the difference between a carriage return (which
         // only brings the write head back at 0 without changing
@@ -186,7 +186,7 @@ u16 getCursorOffset(void) {
     u16 offset = readByte(REG_SCREEN_DATA);
     // Since we requested the high byte
     // (i.e. the 8 most significant bits)
-    // we now want to move them by 8 places.
+    // we now want to move them up by 8 places.
     // Conveniently, that's exactly what a 
     // left shift is for :)
     offset <<= 8;

src/kernel/main.c

@@ -27,7 +27,8 @@ i32 kmain(void) {
 
 
     clearScreen();
-    kprint("0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
+    kprint("00000000000000000000000000000000000000000000000000000000000000000000000000000000"
+           "000000000000000000000000000000000000000000000000");
     kprint("X");
     // TODO...
     return 0x202172; // :D