From c6b989d85bc840e0805d75402b327acfafa69f3c Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 2 Dec 2023 22:29:49 -0500
Subject: [PATCH] Add an input queue, to avoid key drops.

---
 Machines/PCCompatible/PCCompatible.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Machines/PCCompatible/PCCompatible.cpp b/Machines/PCCompatible/PCCompatible.cpp
index 0a71e7a5f..41968a1cd 100644
--- a/Machines/PCCompatible/PCCompatible.cpp
+++ b/Machines/PCCompatible/PCCompatible.cpp
@@ -410,15 +410,22 @@ class KeyboardController {
 			}
 			reset_delay_ -= cycles.as<int>();
 			if(reset_delay_ <= 0) {
+				input_.clear();
 				post(0xaa);
 			}
 		}
 
 		uint8_t read() {
 			pic_.apply_edge<1>(false);
+			if(input_.empty()) {
+				return 0;
+			}
 
-			const uint8_t key = input_;
-			input_ = 0;
+			const uint8_t key = input_.front();
+			input_.erase(input_.begin());
+			if(!input_.empty()) {
+				pic_.apply_edge<1>(true);
+			}
 			return key;
 		}
 
@@ -426,7 +433,7 @@ class KeyboardController {
 			if(mode_ == Mode::NoIRQsIgnoreInput) {
 				return;
 			}
-			input_ = value;
+			input_.push_back(value);
 			pic_.apply_edge<1>(true);
 		}
 
@@ -438,7 +445,7 @@ class KeyboardController {
 			Reset = 0b00,
 		} mode_;
 
-		uint8_t input_ = 0;
+		std::vector<uint8_t> input_;
 		PIC &pic_;
 
 		int reset_delay_ = 0;