From 94d07c78d846f1a7a2af837f563a35bce468963a Mon Sep 17 00:00:00 2001
From: ISSOtm <eldredhabert0@gmail.com>
Date: Thu, 12 Aug 2021 09:19:32 +0200
Subject: [PATCH] Fix MBC3+TIMER + handle lack of BATTERY

`TIMER & BATTERY` is 0, but even `|` would only be checking if
*either* is set; instead, imply BATTERY as soon as TIMER is given,
printing a warning if it was not given.
---
 src/fix/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/fix/main.c b/src/fix/main.c
index ab009db5..b323dd3d 100644
--- a/src/fix/main.c
+++ b/src/fix/main.c
@@ -494,7 +494,9 @@ do { \
 
 		case MBC3:
 			// Handle timer, which also requires battery
-			if (features & (TIMER & BATTERY)) {
+			if (features & TIMER) {
+				if (!(features & BATTERY))
+					fprintf(stderr, "warning: MBC3+TIMER implies BATTERY\n");
 				features &= ~(TIMER | BATTERY); // Reset those bits
 				mbc = MBC3_TIMER_BATTERY;
 				// RAM is handled below