From 59192651298275dfb7daaaf4b2e8f87388085765 Mon Sep 17 00:00:00 2001
From: Nigel Barnes <Pernod70@users.noreply.github.com>
Date: Thu, 22 Aug 2019 03:11:09 +0100
Subject: [PATCH] hd61830: Number of characters must be even 2-128.

---
 src/devices/video/hd61830.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/devices/video/hd61830.cpp b/src/devices/video/hd61830.cpp
index a608c096b1e..15e9930721f 100644
--- a/src/devices/video/hd61830.cpp
+++ b/src/devices/video/hd61830.cpp
@@ -248,6 +248,7 @@ WRITE8_MEMBER( hd61830_device::data_w )
 
 	case INSTRUCTION_NUMBER_OF_CHARACTERS:
 		m_hn = (data & 0x7f) + 1;
+		m_hn = (m_hn % 2 == 0) ? m_hn : (m_hn + 1);
 
 		LOG("HD61830 Number of Characters: %u\n", m_hn);
 		break;
@@ -259,7 +260,7 @@ WRITE8_MEMBER( hd61830_device::data_w )
 		break;
 
 	case INSTRUCTION_CURSOR_POSITION:
-		m_cp = (data & 0x7f) + 1;
+		m_cp = (data & 0x0f) + 1;
 
 		LOG("HD61830 Cursor Position: %u\n", m_cp);
 		break;