PSG - Revision history

Mr z: /* Channels */

2011-09-28T15:36:58Z

‎Channels

Mr z: /* Channels */

2011-09-28T15:34:55Z

‎Channels

Mr z: Protected "PSG" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T09:01:32Z

Protected "PSG" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Mr z at 07:31, 20 May 2010

2010-05-20T07:31:23Z

Mr z at 22:19, 8 October 2007

2007-10-08T22:19:05Z

Arnauld: added reg. addr. for Master and ECS in the table

2005-02-01T12:08:41Z

added reg. addr. for Master and ECS in the table

Mr z: /* Registers */

2005-01-21T00:09:37Z

‎Registers

Mr z at 00:07, 21 January 2005

2005-01-21T00:07:21Z

Pingaso: /* Channels */

2005-01-20T23:00:41Z

‎Channels

Pingaso at 20:46, 20 January 2005

2005-01-20T20:46:24Z

← Older revision		Revision as of 15:36, 28 September 2011
Line 75:		Line 75:


−	Note: Some PSG variants have 5 volume control bits and some have 6. On devices with 5-bit volume registers, volumes $10 - $1F select the envelope generator. On devices with 6-bit volume registers, $30 - $3F selects the envelope generator. On these devices, $10 - $1F select the envelope shifted right by 2 bits, and $20 - $2F select the envelope shifted right by 1 bit. For consistency across all variants, programs should write $3F to select the envelope generator for a particular channel, and should tolerate reading back $1F after having written $3F to a given channel's volume register.	+	Note: Some PSG variants have 5 volume control bits and some have 6. On devices with 5-bit volume registers, volumes $10 - $1F select the envelope generator as the volume source. On devices with 6-bit volume registers, $30 - $3F selects the envelope generator in the same manner. On these 6-bit volume devices, however, $10 - $1F select the envelope shifted right by 2 bits, and $20 - $2F select the envelope shifted right by 1 bit, resulting in "quiet" envelopes. For consistency across all variants, programs should write $3F to select the envelope generator for a particular channel, and should tolerate reading back $1F after having written $3F to a given channel's volume register.

	==Envelope Generator==		==Envelope Generator==

@@ Line 50: / Line 50: @@
 ==Channels==
-volume levels, independent to each channel
+The PSG provides 3 independent analog output channels.  The PSG provides a dedicated square wave tone generator and D/A converter for each of the three output channels.  It also provides a single noise generator and single volume envelope generator, both can be mixed with any combination of the three channels.  The Intellivision mixes the output of the three analog channels directly to produce the final audio output.
 ==Envelope Generator==

@@ Line 1: / Line 1: @@
 [[Category:PSG]]
-The Programmable Sound Generator (PSG) is responsible for most of the Intellivision's sound generating capability.  It also provides an interface to hand controllers and the ECS's keyboard and piano.  Various PSGs were used in the Intellivision from the AY-3-891x family, including the AY-3-8914, AY-3-8915, AY-3-8916 and AY-3-8917.
+The Programmable Sound Generator (PSG) is responsible for most of the Intellivision's sound generating capability.  It also provides an interface to hand controllers and the ECS's keyboard and piano.  Various PSGs were used in the Intellivision from the AY-3-891x family, including the AY-3-8914, AY-3-8916 and AY-3-8917.
 The text below is just a bunch of notes for now, to be organized into something meaningful eventually.

@@ Line 1: / Line 1: @@
 [[Category:PSG]]
-Various PSGs were used in the Intellivision from the AY-3-891x family, including the AY-3-8914, AY-3-8916 and AY-3-8917.
+The Programmable Sound Generator (PSG) is responsible for most of the Intellivision's sound generating capability.  It also provides an interface to hand controllers and the ECS's keyboard and piano.  Various PSGs were used in the Intellivision from the AY-3-891x family, including the AY-3-8914, AY-3-8915, AY-3-8916 and AY-3-8917.
 The text below is just a bunch of notes for now, to be organized into something meaningful eventually.

@@ Line 13: / Line 13: @@
 <table border>
-<tr><th>Register</th><th>Data Bits</th><th>On Bits</th><th>Off Bits</th><th>Description</th></tr>
+<tr><th rowspan=2>Register</th><th colspan=2>Address</th><th rowspan=2>Data Bits</th><th rowspan=2>On Bits</th><th rowspan=2>Off Bits</th><th rowspan=2>Description</th></tr>
-<tr><td>[[PSG Registers R0 - R2|R0]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel A.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><th>Master</th><th>ECS</th></tr>
-<tr><td>[[PSG Registers R0 - R2|R1]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel B.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><td>[[PSG Registers R0 - R2|R0]]</td><td>$01F0</td><td>$00F0</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel A.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Registers R0 - R2|R2]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel C.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><td>[[PSG Registers R0 - R2|R1]]</td><td>$01F1</td><td>$00F1</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel B.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Register R3|R3]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 16-bit envelope period.  The envelope period value is multiplied by two to determine the actual period.  Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
+<tr><td>[[PSG Registers R0 - R2|R2]]</td><td>$01F2</td><td>$00F2</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel C.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Registers R4 - R6|R4]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel A.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><td>[[PSG Register R3|R3]]</td><td>$01F3</td><td>$00F3</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 16-bit envelope period.  The envelope period value is multiplied by two to determine the actual period.  Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
-<tr><td>[[PSG Registers R4 - R6|R5]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel B.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><td>[[PSG Registers R4 - R6|R4]]</td><td>$01F4</td><td>$00F4</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel A.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Registers R4 - R6|R6]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel C.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
+<tr><td>[[PSG Registers R4 - R6|R5]]</td><td>$01F5</td><td>$00F5</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel B.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Register R7|R7]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Upper 8 bits of 16-bit envelope period.  The envelope period value is multiplied by two to determine the actual period.  Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
+<tr><td>[[PSG Registers R4 - R6|R6]]</td><td>$01F6</td><td>$00F6</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channel C.  Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
-<tr><td>[[PSG Register R8|R8]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Channel enables for tone, noise.  I/O port direction selection.</td></tr>
+<tr><td>[[PSG Register R7|R7]]</td><td>$01F7</td><td>$00F7</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Upper 8 bits of 16-bit envelope period.  The envelope period value is multiplied by two to determine the actual period.  Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
 <tr><td>[[PSG Register R9|R9]]</td><td>$001F</td><td>$0000</td><td>$FFE0</td><td>Noise period</td></tr>
-<tr><td>[[PSG Register R10|R10]]</td><td>$0000</td><td>$0000</td><td>$FFFF</td><td>Envelope characteristics / trigger register (write only)</td></tr>
+<tr><td>[[PSG Register R8|R8]]</td><td>$01F8</td><td>$00F8</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Channel enables for tone, noise.  I/O port direction selection.</td></tr>
 <tr><td>[[PSG Registers R11 - R13|R11]]</td><td>$003F</td><td>$0000</td><td>$FFC0</td><td>4-bit Volume / 2-bit Envelope Select for channel A</td></tr>
-<tr><td>[[PSG Registers R11 - R13|R12]]</td><td>$003F</td><td>$0000</td><td>$FFC0</td><td>4-bit Volume / 2-bit Envelope Select for channel B</td></tr>
+<tr><td>[[PSG Register R9|R9]]</td><td>$01F9</td><td>$00F9</td><td>$001F</td><td>$0000</td><td>$FFE0</td><td>Noise period</td></tr>
 <tr><td>[[PSG Registers R11 - R13|R13]]</td><td>$003F</td><td>$0000</td><td>$FFC0</td><td>4-bit Volume / 2-bit Envelope Select for channel C</td></tr>
-<tr><td>[[PSG Regosters R14 - R15|R14]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>8 bit I/O port A</td></tr>
+<tr><td>[[PSG Register R10|R10]]</td><td>$01FA</td><td>$00FA</td><td>$0000</td><td>$0000</td><td>$FFFF</td><td>Envelope characteristics / trigger register (write only)</td></tr>
 <tr><td>[[PSG Registers R14 - R15|R15]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>8 bit I/O port B</td></tr>
 </table>

← Older revision	Revision as of 09:01, 4 December 2010
(No difference)

@@ Line 8: / Line 8: @@
 ==Registers==
 The PSG has 16 registers, numbered R0 through R15.  They appear consecutively in the [[CP1610]]'s address map, with R0 at the starting address for the PSG, and R15 at the last address for the PSG.  The Master Component's PSG registers appear at $01F0 - $01FF in the memory map, and the [[Entertainment Computer System|ECS]]'s PSG registers appear at $00F0 - $00FF in the memory map.
 <table border>

@@ Line 30: / Line 30: @@
 ==Channels==
-square wave output optionally modified by the envelope generator and/or the noise generator
+The PSG contains 3 independent channels, a single noise generator, and a single envelope generator.  Each channel includes a square wave tone generator and is capable of mixing any combination of the output from its respective tone generator with the noise generator and the envelope generator.  Output from each of the 3 channels is then mixed together to produce the final audio output.<br/>
 Volume (0-15)
 Period (1-4096)
@@ Line 38: / Line 41: @@
 volume levels, independent to each channel
 ==Envelope Generator==

← Older revision		Revision as of 20:46, 20 January 2005
Line 7:		Line 7:

	==Registers==		==Registers==
		+	<table border>

		+	<tr><th>Register</th><th>Data Bits</th><th>On Bits</th><th>Off Bits</th><th>Description</th></tr>
		+
		+	<tr><td>[[STIC Register $00\|$00]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel 1. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $01\|$01]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel 2. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $02\|$02]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 12-bit period for channel 3. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $03\|$03]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Lowest 8 bits of 16-bit envelope period. The envelope period value is multiplied by two to determine the actual period. Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
		+
		+	<tr><td>[[STIC Register $07\|$04]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channels 1. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $07\|$05]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channels 2. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $07\|$06]]</td><td>$000F</td><td>$0000</td><td>$FFF0</td><td>Upper 4 bits of 12-bit period for channels 3. Note that a channel period value of zero actually indicates a period of $1000.</td></tr>
		+
		+	<tr><td>[[STIC Register $07\|$07]]</td><td>$00FF</td><td>$0000</td><td>$FF00</td><td>Upper 8 bits of 16-bit envelope period. The envelope period value is multiplied by two to determine the actual period. Note that an envelope period value of zero actually indicates a true envelope period of $20000.</td></tr>
		+
		+	</table>

	==Channels==		==Channels==