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Note Terminology Follow-up, Issue #595

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- The SystemGuide.md file was omitted in the last commit.
- Corrected terminology in the comments of the sound drivers.
This commit is contained in:
Wayne Warthen
2025-07-19 16:10:31 -07:00
parent a75dada16e
commit d754e475c2
10 changed files with 9 additions and 9 deletions
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6
Source/Doc/SystemGuide.md
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@@ -2277,15 +2277,15 @@ using values that correspond to musical notes. The frequency will be
applied when the next SNDPLAY function is invoked. The returned Status
(A) is a standard HBIOS result code.
The Note (HL) values correspond to quarter notes. Increasing/decreasing
the value by 4 results in a full note increment/decrement.
The Note (HL) values correspond to eighth notes. Increasing/decreasing
the value by 8 results in a full note increment/decrement.
Increasing/decreasing the value by 48 results in a full octave
increment/decrement. The value 0 corresponds to Bb/A# in octave 0.
The sound chip resolution and its oscillator limit the range and
accuracy of the notes played. The typical range of the AY-3-8910 is six
octaves: Bb2/A#2 to A7, where each value is a unique tone. Values above
and below can still be played but each quarter tone step may not result
and below can still be played but each eighth tone step may not result
in a note change.
The following table shows the mapping of the Note (HL) value to the

4
Source/HBIOS/ay38910.asm
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@@ -556,10 +556,10 @@ AYT_REGWR .DB "\r\nOUT AY-3-8910 $"
#ENDIF
;
;======================================================================
; QUARTER TONE FREQUENCY TABLE
; EIGHTH TONE FREQUENCY TABLE
;======================================================================
;
; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF QUARTER-NOTES
; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF EIGHTH-NOTES
; STARTING AT A# IN OCTAVE 0 TO THE CORRESPONDING PERIOD
; VALUE TO USE ON THE PSG TO ACHIEVE THE DESIRED NOTE FREQUENCY.
;

4
Source/HBIOS/sn76489.asm
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@@ -452,10 +452,10 @@ SNT_REGWR .DB "\r\nOUT SN76489, $"
#ENDIF
;
;======================================================================
; QUARTER TONE FREQUENCY TABLE
; EIGHTH TONE FREQUENCY TABLE
;======================================================================
;
; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF QUARTER-NOTES
; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF EIGHTH-NOTES
; STARTING AT A# IN OCTAVE 0 TO THE CORRESPONDING PERIOD
; VALUE TO USE ON THE PSG TO ACHIEVE THE DESIRED NOTE FREQUENCY.
;

4
Source/HBIOS/spk.asm
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@@ -6,7 +6,7 @@
;======================================================================
;
; LIMITATIONS - CPU FREQUENCY ADJUSTMENT LIMITED TO 1MHZ RESOLUTION
; QUARTER TONES NOT SUPPORTED
; EIGHTH TONES NOT SUPPORTED
; DURATION FIXED TO 1 SECOND.
; NO VOLUME ADJUSTMENT DUE TO HARDWARE LIMITATION
;======================================================================
@@ -118,7 +118,7 @@ SP_NOTE:
AND 00000011B ; TO THE ASSOCIATED ENTRY
JR Z,SP_NOTE1 ; IN THE TUNE TABLE.
;
LD HL,$FFFF ; QUARTER NOTES
LD HL,$FFFF ; EIGHTH NOTES
JR SP_NOTE2 ; NOT SUPPORTED
;
SP_NOTE1: