diff --git a/Source/Doc/Architecture.md b/Source/Doc/Architecture.md
index 330d7887..ffc3120e 100644
--- a/Source/Doc/Architecture.md
+++ b/Source/Doc/Architecture.md
@@ -1721,6 +1721,7 @@ available along with the registers/information returned.
 |      _Returned Values_
 |           A: Status (0=OK, else error)
 |           DE:HL: Current Timer Tick Count Value
+|           C: Tick frequency (typically 50 or 60)
 
 #### SYSGET Subfunction 0xD1 -- Get Seconds Count (SECONDS)
 
@@ -1806,15 +1807,6 @@ available along with the registers/information used as input.
 |      _Returned Values_
 |           A: Status (0=OK, else error)
 
-#### SYSSET Subfunction 0xD2 -- Inc Timer (TIMER)
-
-|      _Entry Parameters_
-|           BC: 0xF9D2
-
-|      _Returned Values_
-|           A: Status (0=OK, else error)
-
-
 #### SYSSET Subfunction 0xE0 -- Set Boot Information (BOOTINFO)
 
 |      _Entry Parameters_
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 0f0fa77f..b4830d31 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -2458,6 +2458,7 @@ SYS_GETTIMER:
 	HB_DI
 	CALL	LD32
 	HB_EI
+	LD	C, TICKFREQ
 	XOR	A
 	RET
 ;
diff --git a/Source/HBIOS/sn76489.asm b/Source/HBIOS/sn76489.asm
index 524b253d..a15e9429 100644
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -116,7 +116,7 @@ SN7_VOLUME:
 
 SN7_NOTE:
 	AUDTRACE(SNT_NOTE)
-	AUDTRACE_L
+	AUDTRACE_HL
 	AUDTRACE_CR
 
 	LD	H,0