Fixed turbo mode switch

andreas-jonsson · Nov 8, 2023 · 6611c64 · 6611c64
1 parent b644a40
commit 6611c64
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Showing 3 changed files with 10 additions and 3 deletions.
diff --git a/front/sdl/main.c b/front/sdl/main.c
@@ -983,7 +983,13 @@ int main(int argc, char *argv[]) {
 					break;
 				case SDL_KEYUP:
 					if (e.key.keysym.sym == SDLK_F11) {
-						if ((e.key.keysym.mod & KMOD_CTRL)) {
+						if (e.key.keysym.mod & KMOD_ALT) {
+							printf("Toggle turbo!\n");
+							SYNC(
+								vxt_byte data = ppi_device->io.in(VXT_GET_DEVICE_PTR(ppi_device), 0x61);
+								ppi_device->io.out(VXT_GET_DEVICE_PTR(ppi_device), 0x61, data ^ 4);
+							);
+						} else if (e.key.keysym.mod & KMOD_CTRL) {
 							open_window(ctx, "Eject");
 						} else {
 							if (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN) {

diff --git a/front/sdl/window.c b/front/sdl/window.c
@@ -63,6 +63,7 @@ void help_window(mu_Context *ctx) {
 
 		const char *text_l =
 			"<F11>\n"
+			"<Alt+F11>\n"
 			"<Ctrl+F11>\n"
 			"<F12>\n"
 			"<Alt+F12>\n"
@@ -72,6 +73,7 @@ void help_window(mu_Context *ctx) {
 
 		const char *text_r =
 			"Toggle fullscreen\n"
+			"Toggle CPU turbo mode\n"
 			"Eject floppy disk image\n"
 			"Show this help screen\n"
 			"Debug break, if GDB module is loaded\n"

diff --git a/lib/vxt/ppi.c b/lib/vxt/ppi.c
@@ -44,7 +44,6 @@ struct ppi {
     vxt_byte xt_switches;
 
     vxt_byte command;
-    vxt_byte refresh_request;
     bool keyboard_enable;
     bool turbo_enabled;
 
@@ -69,7 +68,7 @@ static vxt_byte in(struct ppi *c, vxt_word port) {
             return data;
         }
         case 0x61:
-            return (c->port_61 & 0xEF) | c->refresh_request;
+            return c->port_61;
         case 0x62:
             return (c->port_61 & 8) ? (c->xt_switches >> 4) : (c->xt_switches & 0xF);
         case 0x64: