Recent posts

#1

Console Repair/Mod Center / Turbonanza PC Engine Mod High-...

Last post by MaRC - 05/29/2026, 06:54 AM

I have several PC Engine consoles—CoreGrafx 1 and 2—and installing Turbonanza requires cutting the metal shield that holds the spring-loaded balls. I didn't like this, so I redesigned the board for installation in the PC Engine. Everything remained essentially the same, but I removed the components responsible for Svideo. I output the image and audio to a replaced DIN9 connector, removing the resistors connecting the original audio to the connector. Everything works fine, the image has minimal banding, but high-frequency noise has appeared in the audio. It's independent of what's happening on the screen, it's not interference from the video. I use a very high-quality cable with shielded wires. If you re-solder the original audio, the high-frequency noise disappears. Is this a flaw in the original mod? Did I mess something up when redesigning it? Or is this noise coming from the additional channel the mod mixes with the main channels? When I get home, I'll try measuring the noise frequency with an oscilloscope.

#2

PC-FX Discussion / Re: PC-FXGA emulation is now h...

Last post by NightWolve - 05/28/2026, 03:27 PM

Hey gameblabla, good to cya around here again sharing some content! Thanks!

Even less PC-FX fans around, but might as well for google search results to spread the word in case someone sees it!

#3

PC-FX Discussion / PC-FXGA emulation is now here ...

Last post by gameblabla - 05/27/2026, 10:41 PM

Here is the world's first PC-FXGA emulator !

I've worked a bit on it as a challenge to see if i could in fact, get it to work, because i had bought a PC-FXGA myself and never set it up, because i reasoned that not having an emulator for it would have meant developing for it would have been slow anyway.
So here it is, after days of working on it, i had gotten initial bootup on Same Game, followed by N-Nyuu! (the other, much less known PC-FXGA exclusive game that does a fair bit of 3D texture mapping but is honestly a worse game to play than Same Game FX is, as much as that game is frustrating).

This was implemented in large parts thanks to the documentation, as well as the official SDK itself that was released for it, which had extensive documentation on the hardware itself.

If you want to try it  yourself, you can do so on the web here :
https://gameblabla.github.io/pcfxemuweb/

You can check out the source code here :
https://github.com/gameblabla/pcfxemu

Note that it doesn't store your data online, it's all stored locally.
I may plan on a proper mobile app at a later point.

Homebrew games are also supported but those that need to load external files need to be repackaged as .ZIP archives to load from, otherwise the games will have unexpected behavior. So yes, you don't need a stupid PC setup to run those games either.

Please enjoy the miniscule PC-FXGA library... or start developing for it !


Trivia : Interestingly, the normal standard PC-FX bios works for this too : Games simply check for the presence of the 3D hardware itself.
Also N-nyuu is extremely rushed and does not even have an error message if ran on a standard PC-FX (Same Game does) and lacks victory screens, this is normal and the intended behavior. That game also can run a bit faster than on the real thing, that will require further testing of the 3D GPU itself.

#4

Console Repair/Mod Center / Re: PC Engine Duo - white scre...

Last post by ModInFrance - 05/26/2026, 04:43 PM

Thanks @thesteve

I feel so dumb. I missed one adress line : A9.

0 contact between the HuCard and the CPU.

It seems the trace broke somewhere below the HuCard reader. Impossible to see. I ran a wire and bam, it works again.

Thanks for pointing me in the right direction.

Romi

#5

Console Repair/Mod Center / Re: PC Engine Duo - white scre...

Last post by thesteve - 05/25/2026, 06:46 PM

D7 is always used
All chipset versions are interchangeable
Don't recall saying to remove the chip
The bus is bidirectional, controlled by/we and /ce signals from the 6280
Most issues are bad address traces
Card to 6280 is direct

#6

Console Repair/Mod Center / Re: PC Engine Duo - white scre...

Last post by ModInFrance - 05/25/2026, 05:03 PM

Small update, it turns out D7 do pulse for a little time when turned on.
I have since swap Huc6280, Huc6270 and the Work Ram from a white PCE but no success.

I seem to be getting pulse from every pin on HuCard Side. At least for some time.

I'm not really sure what to look for anymore.

#7

Console Repair/Mod Center / PC Engine Duo - white screen

Last post by ModInFrance - 05/24/2026, 12:09 PM

Hello to this beautiful community.

I have recapped my Duo a couple of years ago. It was working great but when I tried it again this week I got a white screen with or without a HuCard.

I've followed advices from @thesteve from a previous post. Removed Ic520. Tested the d lines with and without HuCard.
With HuCard, I'm noticing that D7 is stuck high. Not moving a bit. All other D lines are pulsing. I've followed D7 up to huc6280 and it's high all the way
Am I onto something? Is D7 always used or can it stay high?
Related question if I ever try to switch the 6280 and 6270, can I use chips for a white PCE on a Duo?

Thanks a lot,

Romi

#8

Console Repair/Mod Center / Re: core grafx issue after rec...

Last post by Bdoi - 05/22/2026, 01:46 AM

thanks Keith , it s probably not bad caps because , I recaped one more time with electrolytic caps to change ceramics one and no more chance.
I will try to resolder hucard wires mother board side as you suggested!

#9

Console Repair/Mod Center / Re: core grafx issue after rec...

Last post by Keith Courage - 05/21/2026, 04:06 PM

There could be a bad trace to one of your capacitors.

However, depending on how much you moved around the card slot/gray connector cable, one or more of the wires for the gray cable could have disconnected/broken from the board. When this happens, usually one has to strip and resolder all the wires for the cables. It's usualy on the main board end not the Card slot part.

#10

Console Repair/Mod Center / Re: PC Engine (white) still ha...

Last post by Keith Courage - 05/21/2026, 04:02 PM

Could be a bad trace to one of the memory chips. Check traces from memory chips to the HU6270. If traces check good, then maybe a faulty 6270?