Capcom CPS2 digital AV and I/O interfaces

Capcom CPS2 Digital AV and I/O Interfaces

After finishing the repairs on my CPS2 in April, I had already some more additions in mind:

I had already ordered the digital AV interface kit from VideoGamePerfection.com in the beginning of the year and was only waiting for the I/O interface to get started. Last month, it finally arrived. Also on the picture: a home-made kick harness and a RG174 coaxial cable.

Capcom CPS2 digital AV and I/O interfaces
Capcom CPS2 digital AV and I/O interfaces

Detailed pictures of the interface PCBs:

Capcom CPS2 digital AV interface
Capcom CPS2 digital AV interface
Capcom CPS2 digital AV interface
Capcom CPS2 I/O interface
Capcom CPS2 I/O interface
Capcom CPS2 I/O interface

CPS2 digital AV interface installation

The installation is not too hard, although the installation instructions (PDF document) can be quite confusing. Additional pictures and hints in the CPS2 I/O interface thread proved very helpful in figuring it out.

First, solder the 2×5 headers onto the M5M RAM chips.

CPS2 digital AV interface: 2x5 headers on the M5M RAM chips
2×5 headers on the M5M RAM chips

Next, place the 2×5 sockets onto the interface PCB and solder them from the back. Then place the PCB onto the headers and see if it fits. The PCB end with the HDMI port has to sit flush on the frame of the bottom cover, and you should see the black plastic pin in the centre of the hole. The complementary piece from the top cover will later go through the hole and keep the PCB in place.

CPS2 digital AV interface: Interface PCB with 2x5 sockets attached to the headers
Interface PCB with 2×5 sockets attached to the headers

Remove the PCB again and solder the wires to the volume buttons. These will later change the vertical offset and enable/disable the scanlines. Now is also a good time to close the three jumpers J3, J5 and J6 within the U11 footprint, if not already done.

CPS2 digital AV interface: volume buttons signals added
Volume buttons signals added

Put the PCB back onto the headers and align it again. +5V and GND can be tapped from any of the nearby electrolyte capacitors marked CCX. Note: the digital AV interface draws about 200 mA.

CPS2 digital AV interface: +5V power added
+5V power added

Route ribbon cables to TDA1543 for audio and PAL (BGSA5) for sync signals.

CPS2 digital AV interface: audio and sync signals added
Audio and sync signals added

I tapped the clock signal from the 8S F32 chip next to the 16 MHz oscillator. A coaxial cable (e.g. RG174) is mandatory. Solder the inner wire to both pads on the interface PCB (C1 and C2).

CPS2 digital AV interface: clock signal added
Clock signal added

Here is a close-up of the clock and sync signal cables. The coaxial cable is very stiff, so I secured it with hot glue before closing the case to avoid it from accidentally damaging the chip or its legs.

CPS2 digital AV interface: clock and sync signals in detail
Clock and sync signals in detail

Finally, cut a hole for the HDMI port in the top cover next to the buttons. I did it with a Dremel and accidentally cut out too much because the plastic is quite soft. There is no need for power tools, a sharp knife and a file will do the job just fine.

CPS2 digital AV interface: cut-out for HDMI connector
Cut-out for HDMI connector
CPS2 digital AV interface: cut-out for HDMI connector

CPS2 I/O interface installation

The I/O interface installation is pretty straightforward, just plug it into the JAMMA connector and attach the cables for the kick harness.

I am not happy about the final result though. The printed holster of the LCD selector sits right on top of the I/O interface buttons and switches and obstructs the access. More severe is that the buttons are accidentally pushed when touching the holster or the whole unit – which can become a problem when suddenly the test mode is entered while playing a game.

I’ll have to find a solution for this at a later time. I will also shorten the cables to the kick harness then.

Capcom CPS2 digital AV and I/O interfaces installed
Capcom CPS2 digital AV and I/O interfaces installed

Also seen on the picture above: Printed caps that close the holes in the B Board.

Quality

The digital AV interface adds another level of lossless digital quality and also simplicity when compared to my previous setup with SuperGun, OSSC and custom SCART cable (to tap stereo audio from the cinch connectors of the CPS2).

The video output size is fixed at 1080p which is the same as the OSSC in Line5x mode / default 1920×1080 format. This means that 4 lines are missing on both top and bottom of the screen. The vertical offset can be adjusted in 9 steps with Volume – button, but there are always 8 lines missing in total. This isn’t a problem for the OSSC, as the Line5x format can be set 1920×1200. For the digital AV interface, this is not possible.
Another setting that is fixed: the intensity of the scanlines. They can be either enabled or disabled with the Volume + button.
I’m looking forward to future firmware releases that hopefully give more choices for output format and scanline intensity.

And now for some captured images from the CPS2 digital AV interface. There won’t be any captures from the OSSC Line5x mode output for comparison because my video grabber doesn’t like it, unfortunately.

CPS2 digital AV interface: Mars Matrix
Mars Matrix title screen
CPS2 digital AV interface: Mars Matrix + scanlines
Mars Matrix title screen + scanlines
CPS2 digital AV interface: Mars Matrix test menu
Mars Matrix test menu
CPS2 digital AV interface: Mars Matrix test menu + scanlines
Mars Matrix test menu + scanlines
CPS2 digital AV interface: colour bars
Test menu colour bars
CPS2 digital AV interface: colour bars + scanlines
Test menu colour bars colour bars + scanlines
CPS2 digital AV interface: dot cross hatch
Test menu dot cross hatch (vertical offset 4)
CPS2 digital AV interface: dot cross hatch + scanlines
Test menu dot cross hatch (vertical offset 4) + scanlines
CPS2 digital AV interface: vertical offset 5
Vertical offset 5
CPS2 digital AV interface: vertical offset 6
Vertical offset 6
CPS2 digital AV interface: vertical offset 7
Vertical offset 7
CPS2 digital AV interface: vertical offset 8
Vertical offset 8
CPS2 digital AV interface: vertical offset 0
Vertical offset 0
CPS2 digital AV interface: vertical offset 1
Vertical offset 1
CPS2 digital AV interface: vertical offset 2
Vertical offset 2
CPS2 digital AV interface: vertical offset 3
Vertical offset 3


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