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[Third party submission] How to connect a PC-98 to the OSSC
Written by: Shintocetra
The OSSC is a great upscaler for retro video game systems. With a little tweaking, it can also provide HDMI video (and possibly video/audio, depending on your setup) output from a PC-98. I will only list links for purchase of specialized devices.
What you'll need
You'll need this if you want audio output via HDMI, and only if you don't do any of the steps below
- A PC-98. I use a PC-9821 Cx, but this should work for many earlier/later models
- A DB15 (2-row, 15 pin)-VGA(3-row, 15 pin) adapter (unless your PC-98 has a normal VGA port)
- A male-male VGA cable (unless you intend to go down the BNC route below)
- The OSSC
- A HDMI cable.
You don't need, but I recommend
- a 3.5 mm audio jack male-male cable
- The Kenzei
- A PSU for the Kenzei (sold separately)
- A male to male RGB SCART cable
- A 3.5 mm audio jack to RCA stereo (red/white) cable, male-male (unless you have a separate sound system, or your PC-98 has native RCA stereo output)
Only needed if you have a a CRT that won't accept PC-98 frequency
- 2 VGA to BNC connectors, male-male (make sure it has 5 connectors, one for each of the RGBHV signals)
- 2 BNC female-female connectors
- 3 BNC-RCA male adapters
- A connector for HDMI-VGA, HDMI-Component, HDMI-SCART, or whatever connector your CRT uses. Not guaranteed to work.
- 1. Assuming your PC-98 only has a DB15 connector, screw on the DB15-VGA connector (If you have a VGA port, skip this step).
- 2. Connect the VGA cable from the PC-98 to the OSSC (The OSSC needs to have a PSU and HDMI cord attached, and be powered on, but this is obvious, so I won't list it separately).
- 3. In the OSSC menu with default settings, enable the following option: "Sampling opt>Allow upsample2x=on".
- 4. Change the output to at least line2x (3x and up may be possible depending on your display size). Use the OSSC Remote: "TV/AV" button, then "2" button, and experiment with higher numbers if desired.
- 5. Plug the 3.5 mm audio cable from your PC-98 to your OSSC AV1/AV2 port. Skip this step if you intend to do any of the other steps below.
In some cases, make sure your monitor/TV is set to Widescreen. Overall, this setup will make the image look better than standard OSSC settings, but it still may have some visual noise.
Both of the optional extra steps I listed will help with this:
- 6a. Plug the VGA coming from the PC-98 into the Kenzei.
- 7a. Plug the 3.5 mm audio jack to RCA stereo ports on the Kenzei.
- 8a. Plug the SCART cable from the Kenzei to the OSSC. Settings should be the same as before, aside from using the SCART connector/AV1.
- 6b. Remove the VGA-VGA cord, and plug the VGA-BNC connectors into the PC-98, and the OSSC.
- 7b. Use the BNC female-female connectors to connect the HV signals to each other.
- 8b. Put the BNC-RCA adapters on the BNC cables with the for the RGB signals.
- 9b. Plug the RGB cables into the Component/YPbPr ports on the OSSC.
- 10b. In the OSSC menu, go to "Compatibility>use alt. RGB>AV2"
Note that this method will not allow you to use the AV3 3.5 mm audio jack input, so you will not be able to transmit audio via HDMI output.