diff --git a/src/terminal/Terminal.zig b/src/terminal/Terminal.zig
index 4dd352186..6b50fd001 100644
--- a/src/terminal/Terminal.zig
+++ b/src/terminal/Terminal.zig
@@ -495,18 +495,20 @@ pub fn deleteLines(self: *Terminal, count: usize) void {
     self.cursor.x = 0;
 
     // Remaining number of lines in the scrolling region
-    const rem = self.scrolling_region.bottom - self.cursor.y;
+    const rem = self.scrolling_region.bottom - self.cursor.y + 1;
 
     // If the count is more than our remaining lines, we adjust down.
-    const count2 = @minimum(count, rem);
+    const adjusted_count = @minimum(count, rem);
 
     // Scroll up the count amount.
-    var i: usize = 0;
-    while (i < count2) : (i += 1) {
-        self.scrollUpRegion(
-            self.cursor.y,
-            self.scrolling_region.bottom,
-        );
+    var y: usize = self.cursor.y;
+    while (y <= self.scrolling_region.bottom - adjusted_count) : (y += 1) {
+        self.screen.copyRow(y, y + adjusted_count);
+    }
+
+    while (y <= self.scrolling_region.bottom) : (y += 1) {
+        const row = self.screen.getRow(y);
+        std.mem.set(Screen.Cell, row, self.cursor.pen);
     }
 }
 
@@ -520,30 +522,6 @@ pub fn scrollUp(self: *Terminal) void {
     for (last) |*cell| cell.char = 0;
 }
 
-/// Scroll the given region up.
-///
-/// Top and bottom are 0-indexed.
-fn scrollUpRegion(
-    self: *Terminal,
-    top: usize,
-    bottom: usize,
-) void {
-    const tracy = trace(@src());
-    defer tracy.end();
-
-    // Only go to the end of the region OR the end of our lines.
-    const end = @minimum(bottom, self.screen.rows - 1);
-
-    var i: usize = top;
-    while (i < end) : (i += 1) {
-        self.screen.copyRow(i, i + 1);
-    }
-
-    // Blank our last line if we have space.
-    const row = self.screen.getRow(i);
-    for (row) |*cell| cell.char = 0;
-}
-
 /// Scroll the text down by one row.
 /// TODO: test
 pub fn scrollDown(self: *Terminal) !void {
diff --git a/src/terminal/stream.zig b/src/terminal/stream.zig
index 581706f9f..ba262a52f 100644
--- a/src/terminal/stream.zig
+++ b/src/terminal/stream.zig
@@ -48,11 +48,11 @@ pub fn Stream(comptime Handler: type) type {
             //log.debug("char: {x}", .{c});
             const actions = self.parser.next(c);
             for (actions) |action_opt| {
-                if (action_opt) |action| {
-                    if (action != .print) {
-                        log.info("action: {}", .{action});
-                    }
-                }
+                // if (action_opt) |action| {
+                //     if (action != .print) {
+                //         log.info("action: {}", .{action});
+                //     }
+                // }
                 switch (action_opt orelse continue) {
                     .print => |p| if (@hasDecl(T, "print")) try self.handler.print(p),
                     .execute => |code| try self.execute(code),
@@ -328,6 +328,7 @@ pub fn Stream(comptime Handler: type) type {
                 // TODO: test
                 'r' => if (@hasDecl(T, "setTopAndBottomMargin")) switch (action.params.len) {
                     1 => try self.handler.setTopAndBottomMargin(action.params[0], 0),
+                    2 => try self.handler.setTopAndBottomMargin(action.params[0], action.params[1]),
                     else => log.warn("invalid DECSTBM command: {}", .{action}),
                 } else log.warn("unimplemented CSI callback: {}", .{action}),