From f7b67d7fa10ec23ec7d4f44926c37db0af57c10d Mon Sep 17 00:00:00 2001
From: Olivier Galibert <galibert@pobox.com>
Date: Fri, 8 Dec 2023 14:58:03 +0100
Subject: ks0164: reduce the octave bits to 4

---
 src/devices/sound/ks0164.cpp | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/devices/sound/ks0164.cpp b/src/devices/sound/ks0164.cpp
index d1188ce4d55..fc45a2f74cb 100644
--- a/src/devices/sound/ks0164.cpp
+++ b/src/devices/sound/ks0164.cpp
@@ -338,7 +338,7 @@ void ks0164_device::voice_w(offs_t offset, u16 data, u16 mem_mask)
 	if(0 && m_sregs[m_voice_select & 0x1f][offset] != old && offset == 0)
 		logerror("voice %02x.%02x = %04x @ %04x (%04x)\n", m_voice_select & 0x1f, offset, m_sregs[m_voice_select & 0x1f][offset], mem_mask, m_cpu->pc());
 	if(offset == 0 && (data & 1) && !(old & 1))
-		logerror("keyon %02x mode=%04x (%s %c %c %c %c) cur=%02x%04x.%04x loop=%02x%04x.%04x end=%02x%04x.%04x pitch=%02x.%03x 10=%02x/%02x:%02x/%02x 14=%03x/%03x:%03x/%03x 18=%04x/%04x c=%04x   %04x %04x %04x %04x %04x  %04x %04x %04x %04x %04x\n",
+		logerror("keyon %02x mode=%04x (%s %c %c %c %c) cur=%02x%04x.%04x loop=%02x%04x.%04x end=%02x%04x.%04x pitch=%x.%03x 10=%02x/%02x:%02x/%02x 14=%03x/%03x:%03x/%03x 18=%04x/%04x c=%04x   %04x %04x %04x %04x %04x  %04x %04x %04x %04x %04x\n",
 				 m_voice_select,
 
 				 m_sregs[m_voice_select & 0x1f][0x00],
@@ -361,8 +361,8 @@ void ks0164_device::voice_w(offs_t offset, u16 data, u16 mem_mask)
 				 m_sregs[m_voice_select & 0x1f][0x0e],
 				 m_sregs[m_voice_select & 0x1f][0x0f],
 
-				 m_sregs[m_voice_select & 0x1f][0x08] & 0x1f, // pitch
-				 m_sregs[m_voice_select & 0x1f][0x08] >> 5,
+				 m_sregs[m_voice_select & 0x1f][0x08] & 0xf, // pitch
+				 m_sregs[m_voice_select & 0x1f][0x08] >> 4,
 
 				 m_sregs[m_voice_select & 0x1f][0x10] >> 9,
 				 m_sregs[m_voice_select & 0x1f][0x12] >> 9,
@@ -496,10 +496,10 @@ void ks0164_device::sound_stream_update(sound_stream &stream, std::vector<read_s
 				}
 
 				s16 samp = samp0 + (((samp1 - samp0) * (current & 0xffff)) >> 16);
-				u32 step = 0x10000 | (regs[8] & ~0x1f);
-				u32 shift = regs[8] & 0x1f;
-				if(shift > 0x10)
-					step >>= 0x20 - shift;
+				u32 step = 0x10000 | (regs[8] & ~0xf);
+				u32 shift = regs[8] & 0xf;
+				if(shift >= 0x8)
+					step >>= 0x10 - shift;
 				else if(shift)
 					step <<= shift;
 				current += step;
-- 
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