From 8be6cb827bd14c5e3620002ac0d4b942aaa4a2e2 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 7 Jan 2018 20:28:34 -0500
Subject: [PATCH] Implements MSX interrupt/data request reading register.

The disk ROM now appears to accept on-disk bytes, but still announces an IO failure.
---
 Machines/MSX/DiskROM.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Machines/MSX/DiskROM.cpp b/Machines/MSX/DiskROM.cpp
index 1af677d3e..9b90433f2 100644
--- a/Machines/MSX/DiskROM.cpp
+++ b/Machines/MSX/DiskROM.cpp
@@ -44,6 +44,9 @@ uint8_t DiskROM::read(uint16_t address) {
 	if(address >= 0x7ff8 && address < 0x7ffc) {
 		return get_register(address);
 	}
+	if(address == 0x7fff) {
+		return (get_data_request_line() ? 0x00 : 0x80) | (get_interrupt_request_line() ? 0x00 : 0x40);
+	}
 	return rom_[address & 0x3fff];
 }