> compile NEMU

221220000 张三
Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
 23:09:42 up 2 days, 13:23,  1 user,  load average: 1.42, 0.88, 0.57

nemu/src/device/vga.c

@@ -75,7 +75,7 @@ static inline void update_screen() {
 void vga_update_screen() {
   // TODO: call `update_screen()` when the sync register is non-zero,
   // then zero out the sync register
-  if (*sync_reg) {
+  if (*sync_reg != 0) {
     update_screen();
     *sync_reg = 0;
   }