From 056681e32fc299fe1f38b4bf423856bd44833798 Mon Sep 17 00:00:00 2001
From: folkert van heusden <mail@vanheusden.com>
Date: Sun, 21 Apr 2024 22:04:41 +0200
Subject: [PATCH] dummy core-memory parity

---
 bus.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/bus.cpp b/bus.cpp
index 1670647..63cb4f6 100644
--- a/bus.cpp
+++ b/bus.cpp
@@ -287,6 +287,11 @@ uint16_t bus::read(const uint16_t addr_in, const word_mode_t word_mode, const rm
 			return 0;
 		}
 
+		if (a >= 0172100 && a <= 0172137) {  // MM11-LP parity
+			if (!peek_only) DOLOG(debug, false, "READ-I/O MM11-LP parity (%06o): %o", a, 1);
+			return 1;
+		}
+
 		if (word_mode == wm_byte) {
 			if (a == ADDR_PSW) { // PSW
 				uint8_t temp = c->getPSW();
@@ -988,6 +993,11 @@ write_rc_t bus::write(const uint16_t addr_in, const word_mode_t word_mode, uint1
 			return { false };
 		}
 
+		if (a >= 0172100 && a <= 0172137) {  // MM11-LP parity
+			DOLOG(debug, false, "WRITE-I/O MM11-LP parity (%06o): %o", a, value);
+			return { false };
+		}
+
 		/// MMU ///
 		// supervisor
 		if (a >= ADDR_PDR_SV_START && a < ADDR_PDR_SV_END) {