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Add notes to Williams D-11581 Audio Board device [Lord Nightmare]

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Lord-Nightmare 2020-07-06 05:25:28 -04:00
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src/mame/audio/s11c_bg.cpp
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// license:BSD-3-Clause
// copyright-holders:Barry Rodewald
/*
* s11c_bg.c - Williams System 11C background music (M68B09E + YM2151 + HC55516 + DAC)
* s11c_bg.cpp - Williams D-11581 "Audio Board" (M68B09E + YM2151 + HC55516 + DAC)
* Used by Williams System 11A (F-14), all System 11V (except Jokerz) and all System 11C pinballs
* Used by Midway Y-Unit Arcade Hardware (for Smash TV and High Impact Football)
*
* The mixing resistors before the MC1458 differ between the D-11581, D-11581-20xx (System 11C), and D-1129x board schematics:
* D-1129x D-11581 D-11581-20xx
* CPU_SOUND R32 2.2k R12 2.2k R12 4.7k
* YM2151 CH1 R33 10k R14 10k R14 20k
* YM2151 CH2 R34 10k R15 10k R15 20k
* MC1408 DAC R35 10k R16 6.3k R16 13k
* CVSD [R30 10k] [R13 4.99k 2%] R13 4.99k 2%
* MC1458 Feedback R38 10k R17 10k R17 10k
* MC1458 +-to-gnd R36 4.7k R11 4.7k R11 4.7k
* [] - if CVSD section present
* Note that some D-11581 boards have the D-11297/8 mixing resistors in place, possibly those
* originally intended for use as replacement parts for D-1129x boards
* See https://pinwiki.com/wiki/images/f/fc/System_11_Sound_Board.JPG for an example, which
* may have originally been a D-11298 replacement, as the CVSD section is unpopulated.
* Note that the System11C D-11581-20xx boards have the mixing resistors changed to make the CVSD sound twice
* as loud as it typically would be, by doubling the resistor values for the other mixer inputs, see
* https://pinwiki.com/wiki/images/7/7e/System11CSoundBoard.jpg
* D-11581 Jumpers:
* W1 - exclusive w/W4, W6 : YM2151 reset comes from Board PIA CA2
* W2 - exclusive w/W3 : EPROMS U4, U19, [U20] are 27512
* W3 - exclusive w/W2 : EPROMS U4, U19, [U20] are 2764, 27128 or 27256 (where pin 1 must be high) [Pre-System 11C boards (i.e. D-11581) have a trace shorting W3 closed permanently which must be cut if 27512 EPROMs are to be used]
* W4 -'exclusive'w/W4, W6 : YM2151 reset comes from PIA CB2/J4 P12 (internal or external)
* W5 : Board Reset comes from J4 P18 (if absent, Board Reset is generated from power up)
* W6 - exclusive w/W4, W6 : YM2151 reset comes from Board Reset
* W7 : if present, the VCC/+5v rail is shorted to the +12v rail. (This is used in the case where the board is only run on +5v and -12v instead of +5v, +12v, and -12v)
* W8 - exclusive w/W9 : U5 is a 6164 SRAM (pin 23/A11 is grounded)
* W9 - exclusive w/W8 : U5 is a 6116 SRAM (pin 21, footprint pin 23, is /WE)
These two jumpers are only on the D-11581-20xx (System 11C) version, and W2 and W3 do not affect U20 on this PCB version:
* W10 - linked w/W2+W3 : (only if W2 is also set) EPROM U20 is a 27512
* W11 - linked w/W2+W3 : EPROM U20 is a 2764, 27128 or 27256 (where pin 1 must be high)
* Williams D-11297/D-11298 "BG Music & Speech Board":
* D-11297/D-11298 is the predecessor to D-11581, and is fully compatible with it.
* It is a larger board, physically.
* It is used on the following Williams System 11A games:
* D-11297 (CVSD populated) : PIN*BOT
* D-11298 (CVSD unpopulated): Millionaire!
* Unlike the later D-11581 board which has mono output only, the D-11297/8 board
* has provisions for stereo output from the ym2151, but it is unclear if these were
* ever populated on any shipping boards.
* D-1129x Jumpers:
* W1 : Board Reset comes from J4 P18 (if absent, Board Reset is generated from power up or a manual test switch sw1)
* W2 - exclusive w/W3 : EPROMS U4, U19, U20 are 27512
* W3 - exclusive w/W2 : EPROMS U4, U19, U20 are 2764, 27128 or 27256 (where pin 1 must be high)
* W4 : if present, the VCC/+5v rail is shorted to the +12v rail. (This is used in the case where the board is only run on +5v and -12v instead of +5v, +12v, and -12v)
* W5 - exclusive w/W6, W7 : YM2151 reset comes from Board Reset
* W6 -'exclusive'w/W5, W7 : YM2151 reset comes from PIA CB2/J4 P12 (internal or external)
* W7 - exclusive w/W5, W6 : YM2151 reset comes from Board PIA CA2
* The CVSD filter on all of these boards has the same components:
*
* .--------+---------. .--------+---------.
* | | | | | |
* Z --- c2 | Z --- c12 |
* Z r3 --- 180pf | Z r13 --- 1200pf |
* Z 180k | | Z 27k | |
* + c10 r1 | r2 | |\ | r11 | r12 | |\ |
* In >----|(------ZZZZ----+---------+--ZZZZ--+ | \ +----ZZZZ----+---------+--ZZZZ--+ | \ |
* 1uf 43k | 36k '--|- \ | 27k | 15k '--|- \ | + c20
* --- c1 | >--' --- c11 | >--+----|(----> to mix resistor
* --- 0uf[1] .--|+ / --- 4700pf .--|+ / 10uf
* | r4 | | / | r14 | | /
* gnd .--ZZZZ--' |/ gnd .--ZZZZ--' |/
* | 220k MC1458 | 27k MC1458
* gnd gnd
*
*
* [1] Logically there should be a capacitor to ground at c1 of value 1800uf,
* but this was omitted on the D-11297 board, possibly in error, and this
* omission carried over to future sound boards including all versions of the D-11581.
* The WPC-AN sound board, A-12738-50xxx, fixed this by completely redesigning the filters for both the ym2151 and cvsd.
*
* This circuit would be a 4th order (cascaded 2nd order) op-amp multifeedback lowpass filter,
* but because of the capacitor omitted, it is actually a first order-with-gain lowpass,
* cascaded into a 2nd order lowpass, forming a 3rd order filter.
*
* This same exact circuit, same component values (but including the capacitor missing here),
* appears on the System 11 and System 11A mainboards.
* System 11B changed the components slightly, presumably so the CVSD produced on the mainboard
* sounded a bit different tone-wise to the CVSD produced from the Audio Board.
* Williams "BG Music Board" D-11197-542 16-8972
* * used on Williams System 11 'Road Kings' only
* * has DAC and YM2151/YM3012
* * PIA CA2 EPROM banking
* * This board, like D-1129x, has provisions for YM2151 stereo via two amplifiers to be
* populated on the board itself, but like D-1129x they and their supporting passives are not populated.
* The mixing resistors on this board are the same as D-1129x, except the CPU_SOUND input resistor is 2.7k instead of 2.2k
* There is no CVSD section at all.
* D-11197 Jumpers:
* W1 : Board Reset comes from J4 P18 (if absent, Board Reset is generated from power up or a manual test switch sw1)
* W2 - exclusive w/W3 : EPROMS U4 is a 27512
* W3 - exclusive w/W2 : EPROMS U4 is a 2764, 27128 or 27256 (where pin 1 must be high)
* W4 : if present, the VCC/+5v rail is shorted to the +12v rail. (This is used in the case where the board is only run on +5v and -12v instead of +5v, +12v, and -12v)
* W5 - exclusive w/W6, W7 : YM2151 reset comes from Board Reset
* W6 -'exclusive'w/W5, W7 : YM2151 reset comes from PIA CB2/J4 P12 (internal or external)
* Williams "BG Sound Board" C-11029/C-11030 5766-10929-00
* * used on Williams System 11 'High Speed' and 'Grand Lizard' only
* * has DAC only
* * no EPROM banking hardware, 1 28-pin ROM socket (2764/27128/27256 only)
* * PIA CA1 and CA2 are labeled 'HAND1' and 'HAND2' on schematics and are tied high/unused.
* * This board has some provisions for what looks like incoming and outgoing octal latch
* for data to be read from/writen to by the PIA, but this is unpopulated/bypassed on the pcb
* C-11029/C-11030 Jumpers:
* W1 : Board Reset comes from J4 P18 (if absent, Board Reset is generated from power up or a manual test switch sw1)
*
* Created on: 2/10/2013
* Author: bsr
* Updated on: 7/6/2020
* Author: lord nightmare
*/
#include "emu.h"