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playmark.cpp: Add note about a S87C751-based World Beach Volley (nw) (#6035)

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* playmark.cpp: Add note about a S87C751-based World Beach Volley (nw)

* Restore comment (nw)
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ClawGrip 2019-12-10 15:42:23 +01:00 committed by Ivan Vangelista
parent 5a70dfca56
commit 4486477560
1 changed files with 34 additions and 4 deletions
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38
src/mame/drivers/playmark.cpp
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@ -43,17 +43,47 @@ to correct the music playback sequencing and also allow sound effect samples to
play on any of the three available sample channels. The fourth channel is reserved
for music playback.
HotMind and presumably Lucky Boom have a Jamma expansion board that plugs onto the
main boards Jamma connector and provides extra I/O using the generic Player-2 pins.
There is another World Beach Volley with a (undumped) S87C751 for sound instead of a
PIC (also with an OKI M6295) which fully matches "World Beach Volley (set 1)" for the
other ROMS. It's an original PCB from Playmark Italy.
HotMind, World Beach Volley and presumably Lucky Boom have a JAMMA expansion board
that plugs onto the main boards Jamma connector and provides extra I/O using the
generic Player-2 pins.
The expansion boards provides I/O for the Token and Ticket dispensers, drive circuit
for Coin-In Counter and Credit-Out Counter. In the case of HotMind, a 93C46 EEPROM
for storing game config/stats. The Expansion board then has a male Jamma connector
that you plug into your Jamma harness.
The World Beach Volley JAMMA expansion board for the 87C751 version follows this layout:
PLAYMARK ITALY 1995
LINK2
____________________________
|___ ___________ |
| | TDA1510AQ| |
___| |__________| |
|__ |
J |__ |
A __| |
M |__ |
M |__ ___________ |
A |__ |_MCT1413P_| |
|__ |
|__ _|___
|__ ____________ |DB9|
|__ |SN74LS245N_| | | To main PCB
|__ ____________ |___|
|__ |S87C751-4N24 |
|__ ______ |
___| |XTAL|<-12.000 |
| |____| |
|__________________________|
TODO:
- World Beach Volley and Hard Times sound is controlled by a PIC16C57 whose internal
ROM is currently missing.
- Hard Times sound is controlled by a PIC16C57 whose internal ROM is currently missing.
- Dump the World Beach Volley sound S87C751 internal ROM.
- Lucky Boom has some minor colour issue with the background - see the title screen. The
game selects the wrong colour for some tiles. The tiles should be colour 0x01 not 0x02.
Affects the backgrounds in game however it's barely noticeable.