From d00d71a4c503c91239dd8fa50e3c715b28a943e8 Mon Sep 17 00:00:00 2001
From: Curt Coder <curtcoder@mail.com>
Date: Wed, 29 Mar 2023 09:50:24 +0300
Subject: [PATCH] abc1600: Improve comment

---
 src/mame/luxor/abc1600mac.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/mame/luxor/abc1600mac.cpp b/src/mame/luxor/abc1600mac.cpp
index 819d6c7157b..b25c63d208f 100644
--- a/src/mame/luxor/abc1600mac.cpp
+++ b/src/mame/luxor/abc1600mac.cpp
@@ -579,7 +579,13 @@ void abc1600_mac_device::page_hi_w(offs_t offset, uint8_t data)
 
 offs_t abc1600_mac_device::get_dma_address(int index, offs_t offset, bool &rw)
 {
-	// A0 = DMA15, A1 = BA1, A2 = BA2
+	/*
+	            BA2 BA1 A15
+	    DMA0     1   1   x
+	    DMA1     1   0   x
+	    DMA2     0   0   x
+	*/
+
 	uint8_t dmamap_addr = index | BIT(offset, 15);
 	uint8_t dmamap = m_dmamap[dmamap_addr];