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AY-3-8910 MINORS

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This commit is contained in:
b1ackmai1er
2023-02-19 13:06:45 +08:00
parent 2da5ba80ba
commit af2a025cff
2 changed files with 10 additions and 3 deletions
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2
Source/Doc/SystemGuide.md
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@@ -1241,7 +1241,7 @@ The Status (A) is a standard HBIOS result code.
Assign the specified character Attribute (E) code to be used for all
subsequent character writes/fills on the specified Video Unit (C). This
attribute is used to fill new lines generated by scroll operations. The
character attributes values are listed abovev. Note that a given video
character attributes values are listed above. Note that a given video
display may or may not support any/all attributes. The Status (A) is a
standard HBIOS result code.

11
Source/HBIOS/ay38910.asm
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@@ -11,6 +11,13 @@
; @1.7897725 OCTAVE RANGE IS 2 - 7 (Bb2/A#2 .. A7)
; @2.0000000 OCTAVE RANGE IS 2 - 7 (B2 .. A7)
;
; DIFFENCES BETWEEN AY-3-8910 AND YM2149
; THE AY-3-8910 HAS 16 ENVELOPE LEVELS, YM2149 HAS 32.
; THIS AFFECTS AUDIO OUTPUT ONLY. THERE IS NO PROGRAMMING IMPACT.
; UNUSED BITS IN REGISTERS ARE READ AS ZERO ON AY-3-8910.
; UNUSED BITS CAN BE READ BACK AND WRITTEN ON YM.
; VOLTAGE LEVEL OUTPUT ON A AY-3-8910 IS LOW AND AROUND 2V ON YM2149.
;
AY_RCSND .EQU 0 ; 0 = EB MODULE, 1=MF MODULE
;
#IF (AYMODE == AYMODE_SCG)
@@ -101,8 +108,8 @@ AY_NOISECNT .EQU 1 ; COUNT NUMBER OF NOISE CHANNELS
;AY_SCALE .EQU 3 ; DATA TO MAINTAIN MAXIMUM
;#ENDIF ; RANGE AND ACCURACY
;
.ECHO "SN76489 CLOCK: "
.ECHO SN7CLK
.ECHO "AY38910 CLOCK: "
.ECHO AY_CLK
.ECHO "\n"
;
#INCLUDE "audio.inc"