From: Toni Wilen <twilen@winuae.net>
Date: Sun, 6 Nov 2022 17:00:34 +0000 (+0200)
Subject: Reading non-existing register fix
X-Git-Tag: 41000~83
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=2cf8ea7b570ce1ad35caf297b5927c1c06b3cc42;p=francis%2Fwinuae.git

Reading non-existing register fix
---

diff --git a/custom.cpp b/custom.cpp
index 8b72c8c1..e0ad5d65 100644
--- a/custom.cpp
+++ b/custom.cpp
@@ -13727,8 +13727,9 @@ writeonly:
 			// - if last cycle was DMA cycle: DMA cycle data
 			// - if last cycle was not DMA cycle: FFFF or some ANDed old data.
 			//
-			c = cycle_line_slot[hpos] & CYCLE_MASK;
-			bmdma = bitplane_dma_access(hpos, 0);
+			int hp = (hpos - 1) % maxhpos;
+			c = cycle_line_slot[hp] & CYCLE_MASK;
+			bmdma = bitplane_dma_access(hp, 0);
 			if (aga_mode) {
 				if (bmdma || (c > CYCLE_REFRESH && c < CYCLE_CPU)) {
 					v = regs.chipset_latch_rw;