Latest revision as of 01:18, 28 August 2019

Picture courtesy of [MVS-Scans]. EDGE1 is on the right, EDGE2 on the left.

Multiplayer extension board used with Kizuna Encounter - Super Tag Battle to allow 4 players to play on the same system. It forms a Y splitter with 2 JAMMA edges to connect two displays, two pair of speakers and two sets of 2-player controls.

It multiplexes the inputs by using selection signals coming from a 4-wire (actually 2 used) cable that connects to the output port of the MV1B or MV1C, it also provides video signal buffering and power for the speakers (power amp under the heatsink).

Inputs

The REG_POUTPUT register is used to detect the board and select which set of inputs to read.

OUT1: set selection
OUT2: seems unused
OUT3: used for board detection by the system ROM

OUT1	P1 reads	P2 reads
low	EDGE 1 P1	EDGE 2 P1
high	EDGE 1 P2	EDGE 2 P2

When OUT3 is high, it simulates presses on particular buttons:

EDGE 1 player 1 button A
EDGE 2 player 1 button A
EDGE 1 player 2 button B
EDGE 2 player 2 button B

Schematic

@@ Line 1: / Line 1: @@
-[[File:Ftc1b.jpg|thumb|Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]
+[[File:Ftc1b.jpg|thumb|Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]]. EDGE1 is on the right, EDGE2 on the left.]]
-[[Multiplayer]] [[extension board]] (only ?) used with [[Kizuna Encounter - Super Tag Battle]] to allow 4 players to play on the same [[MVS system|MVS]] board. It forms a Y splitter with 2 [[JAMMA connector pinout|JAMMA]] edges to connect two monitors, two pair of speakers and two 2-player controls.
+[[Multiplayer]] [[extension board]] used with [[Kizuna Encounter - Super Tag Battle]] to allow 4 players to play on the same system. It forms a Y splitter with 2 [[JAMMA connector pinout|JAMMA]] edges to connect two displays, two pair of speakers and two sets of 2-player controls.
-It multiplexes the inputs from both JAMMA edges and the selection signals from a 4-wire (actually 3 used) cable that connects to the [[output port]] of the {{PCB|MV1B}} or {{PCB|MV1C}}, it also provides analog buffering for the video signals and power for the speakers (amp under the heatsink).
+It multiplexes the inputs by using selection signals coming from a 4-wire (actually 2 used) cable that connects to the [[output port]] of the {{PCB|MV1B}} or {{PCB|MV1C}}, it also provides video signal buffering and power for the speakers ([[power amp]] under the heatsink).
 =Inputs=
-Uses {{Reg|REG_POUTPUT}}. OUT1 is input selection, OUT2 seems to be unused, OUT3 is used for board detection by the [[system ROM]].
+The {{Reg|REG_POUTPUT}} register is used to detect the board and select which set of inputs to read.
+* OUT1: set selection
+* OUT2: seems unused
+* OUT3: used for board detection by the [[system ROM]]
-When OUT1 is low:
+{|class="wikitable"
-* P1 reads EDGE 1 (right), player 1
+!OUT1||P1 reads||P2 reads
-* P2 reads EDGE 2 (left), player 1
+|-
+|low||EDGE 1 P1||EDGE 2 P1
+|-
+|high||EDGE 1 P2||EDGE 2 P2
+|}
-Whe OUT1 is high:
+When OUT3 is high, it simulates presses on particular buttons:
-*P1 reads EDGE 1 (right), player 2
+* EDGE 1 player 1 button A
-*P2 reads EDGE 2 (left), player 2
+* EDGE 2 player 1 button A
+* EDGE 1 player 2 button B
+* EDGE 2 player 2 button B
-When OUT3 is high:
+=Schematic=
-*EDGE 1 player 1 button A is pressed
-*EDGE 2 player 1 button A is pressed
-*EDGE 1 player 2 button B is pressed
-*EDGE 2 player 2 button B is pressed
-=Video buffer=
-The AD8044 is a quadruple rail to rail op-amp with 150MHz bandwidth.
 [[File:Ftc1b_schematic.png|800px]]

NEO-FTC1B board: Difference between revisions

Latest revision as of 01:18, 28 August 2019

Inputs

Schematic

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