Author Topic: Bacteria's IntoGrafx modding project  (Read 1495 times)

bacteria

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Bacteria's IntoGrafx modding project
« on: April 17, 2009, 02:08:02 AM »
Taking on from my post in the discussion section HERE  there seemed an interest in me documenting my WIP on this site, so here is the thread!  :dance:

Also, no point covering old ground; details of this project to date are in the link above and via my website www.modded-by-bacteria.com . I have started a blog using WordPress which is far more suited to my needs than the website, so my intention is to leave the website alone, update the rest of my project here, then get to work on my blog site, prior to product announcement on the web.  :mrgreen:

So, let's take it from here:

My case halves are made from vacuum formed 2mm thick Plasticard (Styrene). I spent literally hours on my case backing section sanding it totally smooth, the result was worth it. Used the original HUcard slot, hot glued in place and filled with putty, then fine crack Polyfiller; gave the case a through sanding. Small holes and slots are made via small files, which are indispensable for this type of project work.



Once ready, I spent about 2 days spray painting the case backing with red spray paint - it took many, many coats before the grey of the cart slot and green of the putty became red. In this state, you have to be very careful handling the case as it picks up fingerprints really easily. The case was left for a full day to completely dry out, then a fairly think coating of Crystal varnish spray paint was applied, to seal the paint allowing for handling, although not enough to be "final". The reason for this is that if the surface is too shiny/varnished, decals don't stick or stay on. Fine balance.

Added decals, using clear waterslide paper. This material is quite expensive at about £3 a sheet of A4, but if you are careful and frugal, one sheet will last for several portables. You just print to it via your computer printer, let it dry, then coat with spray with varnish to stop the ink running when submerged in water. Once dried, cut the decals to size, put into water and when the thin clear plastic starts to separate from the white paper backing, just place the decal onto your case. You can still move the decal about for a short while, while it remains wet, then press on with a piece of tissue to set in place.

Then, two or three fairly thick coats more of the Crystal varnish spray paint applied to finish the job, and the case left then for a day to set hard.

Below are some pics of the final case shell, prior to installing the guts of the system. You will notice that I cut a slot above the HUcard slot to power the system on? There is enough space here for a small switch. It was a balance as to which way around to put some of the decals, my logic is that you see the decals on the side when the system is upside down, eg when inserting a game; however the recharging jack and headphone jack need to be the other way around as you use those when the case is face upwards.



Hole for a home-made eight pole double throw switch, to select between American and Japanese games. The other holes are for a triple throw switch on each side for the three speed button settings.



Logos; and headphone jack and recharging jack. The larger hole is just big enough for a headphone jack to protrude.



Although I am using a PAL TurboGrafx, which outputs in composite as standard, the quality of composite is ok but not brilliant. I am going to use a Logic 3 PSone screen instead of an official PSone screen as the screen size is bigger and the image is even better; although the Logic 3 screen is only RGB input. Connecting RGB to the Logic 3 screen looks nice but the image scrolls, which means the signal needs to be amplified; in this case, just the C-Sync line. Interestingly, the official PSone screen (which I also tested) would need all four lines amplified as nothing shows on the screen apart from waviness.

To tap off the RGB:



And to make the amplifier (assuming just the C-Sync amplifier is needed as the picture on the Logic 3 screen is good otherwise):



esteban

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Re: Bacteria's IntoGrafx modding project
« Reply #1 on: April 17, 2009, 02:14:33 AM »
Nice.

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spenoza

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Re: Bacteria's IntoGrafx modding project
« Reply #2 on: April 17, 2009, 04:17:27 AM »
Tres cool.
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Duo_R

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Re: Bacteria's IntoGrafx modding project
« Reply #3 on: April 17, 2009, 03:35:19 PM »
Looking very nice!
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bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #4 on: April 18, 2009, 02:01:17 AM »
Thanks guys, appreciated.

Found out why I am sick - got chicken pox - yes, I never had it before, had to wait until I was nearly 43 to get it  :-&  Will be doing some good modding this coming week though, but nothing up to my usual speed!

esteban

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Re: Bacteria's IntoGrafx modding project
« Reply #5 on: April 18, 2009, 05:41:33 PM »
Thanks guys, appreciated.

Found out why I am sick - got chicken pox - yes, I never had it before, had to wait until I was nearly 43 to get it  :-&  Will be doing some good modding this coming week though, but nothing up to my usual speed!

I've heard Chicken Pox as an adult can be brutal. So, try to finish the IntoGrafx project before shuffling off this mortal coil. :)
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bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #6 on: April 19, 2009, 05:17:00 AM »
My head, face and neck are totally covered; my shoulders, chest and back are well covered too. Unusually and fortunately, my "pain threshold" as the nurse put it must be high as my pox aren't bothering me to scratch them; if I get any tingle sensations I can easily block them from my mind - will power: otherwise I would be in major agony!  8-[  I have two pox on my left hand that are a pain when I hold things or move my finger; and a large one on my right arm and inch from my wrist, which is annoying when I type - otherwise, "meh".

Anyway, will do more modding and post updates tomorrow - case backing is done, need to experiment with RGB mod, get board installed in case (meaning resoldering existing connections and re-applying them), mount batteries, etc. I also need to make the case front ready - get that made to size. I also need to get generic connections made to interact between two separated case halves - remember I mentioned about V2 major upgrade to my old Multi-Platform system??...

bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #7 on: April 19, 2009, 11:20:28 PM »
Update: here is a pic showing the PAL Turbografx running Salamander (japanese) HUcard, via composite (right screen on wall) and also RGB via the Logic 3 PSone screen on the left, at the same time.



These pics aren't great, sunny day shining on screens, etc; but good enough for illustration:





Now, here's the funny thing. Unlike the official PSone screen with clearly doesn't amplify the RGB or C-sync enough so the image is useless without amplification from the Turbografx, the Logic 3 RGB only screen is fine for RGB but the C-sync wasn't right as the screen was scrolling slowly; so needed assistance with an external amplifier circuit. Not an issue, made one as per the diagram posted before - however, it doesn't need a 5v input - picture is stable and great without any voltage applied. As you see in the pic, I rigged up a 7805 to a 7.4v Li-ion cell to output 5.02v; however, if I try to use the 5v as directed, the screen gets half garbled.

Anyway, bottom line is it works, stable RGB image.  :dance:




bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #8 on: April 20, 2009, 12:01:03 AM »
Rats - tried some other games and the results were unstable. That rules out the Logic 3 screen unfortunately. All I can do is build the rest of the RGB circuit to run along with the C-Sync one I made and try that in a normal PSone screen. If that doesn't give good results, I have no option but to stay with the composite output from the system as default - not ideal, the red is a bit strong and the yellow a bit weak, but I may have no option. It isn't too bad frankly, just being a perfectionist!  No point having one game working fine if another doesn't, so these are my remaining options left.

Necromancer

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Re: Bacteria's IntoGrafx modding project
« Reply #9 on: April 20, 2009, 03:40:52 AM »
Very cool stuff.  Good luck getting the RGB working properly.
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bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #10 on: April 20, 2009, 04:41:38 AM »
Spent the day and got to the conclusion that either that circuit doesn't work or it doesn't work on PAL Turbografx models. The best I got was a stable picture on the Logic 3 screen but had a little interference. Adding the 5v still made no difference. In fact, when I tried it, the composite went screwy for a while, before being ok again. I was just relieved the composite came back ok.

Short and long of it is that I got a fairly decent picture with slightly better colours than the official PSone screen in composite mode but there was something up on the blue and luma lines; couldn't make a difference (nearly damaged something in the process); and stay with good old composite, red and blue colours a little strong however good resolution and stable image.

Looks like i'm going to have to go the composite route. I can't justify spending £100 on a PC-Engine system, which may or may not be better, when I have a working and trimmed system already. It's not like SNES or N64 units you can buy in the UK car boot sales for £3 each, when you can afford to ditch a few - these systems are hard to get hold of and expensive!

Duo_R

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Re: Bacteria's IntoGrafx modding project
« Reply #11 on: April 20, 2009, 08:11:13 AM »
Don't go composite. I wired up a PS1 screen without an amp and the worst I noticed was I saw the vertical lines on bright color levels. . However, with an amp circuit, the lines are almost gone, and the picture looks amazing.


However, you stated the PS1 screen doesn't look good, this is my Duo hooked up via RGB without amp:



http://www.pcenginefx.com/forums/index.php?topic=5733.0

Did u connect sync to pin 5 "S-Video Y" instead of 6 "sync"?

PS - pin 5 works best for NTSC too

Quote
After cutting the cable in half, discarding the male end and stripping the wires, it was a just case of finding the pin-outs for the screen and seeing which colour wires were required. Naturally the pin-outs are the same as a Playstation and according to this site, they are:

1 - Ground
2 - Audio right
3 - Ground
4 - Audio Left
5 - S Video Y (IMHO: "PAL SYNC" - SEE IMPORTANT NOTE)
6 - NTSC video / Composite Sync (IMHO:"N/C" - SEE IMPORTANT NOTE)
7 - S-video C
8 - Video Ground
9 - Blue
10 - 5 volts (PSone LCD screen sense line, screen powers up when 5V)
11 - Red
12 - Green

* IMPORTANT! Connecting the composite sync to pin 6 does not work in my experience, it should be connected to pin 5. Not sure why most sites say pin 6 is composite sync (perhaps the key means pin 6 is for NTSC period? I'm in PALsville here..)

http://www.retroleum.co.uk/psone_lcd.html

« Last Edit: April 20, 2009, 08:19:22 AM by Duo_R »
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bacteria

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Re: Bacteria's IntoGrafx modding project
« Reply #12 on: April 21, 2009, 02:49:57 AM »
I have spent two days pulling my hair out (what I have, going-baldy-git that I am!) about this. Wiring up RGB wires to RGB on a PSone monitor is bread and butter to me, yet all I was getting was occasional image, mostly scrolling or corrupt or just getting partial lines in the middle. The RGB site (pic I posted before, listed again, has an important ERROR on it. They are not all equal...



All EXCEPT the PAL TurboGrafx. My system! The signals tapping off the HU6260 chip are too weak to even be amplified. I was thinking "how the hell did Duo_R get such a great result and I can't, doing the same thing?". I only had one brainwave left - the *wonderful* CXA1145P chip that encodes PAL/NTSC RGB into crappy composite output. Obviously it takes RGB in, but what other options do I get I wondered?

Found a PDF from this excellent site HERE and this schematic:



Ok, I thought, how about tapping RGB and C-Sync off this instead? Pins 23, 22, 21 and 11. Nothing to lose trying, I thought.

Result - stable, lovely RGB picture which doesn't shudder, no lines, nothing. Better yellow, weaker blue and red; colours in other words look correct now, as they should. Only thing is the brightness on my PSone screen is turned to max and the light level is quite acceptable, but slightly brighter would have been nice.

Any ideas to make the image a little brighter? If not, that's fine, I have a great picture in RGB at last, which is what matters!  :dance:

This is the good thing about forums like this, I can share my discoveries and also others can share theirs to me.

I was getting to the end of my tether with this, my tenacity was keeping me seeking the solution. Pleased I found it, all be it from tapping from the CXA1145P chip and not the HU6260 chip...

Duo_R

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Re: Bacteria's IntoGrafx modding project
« Reply #13 on: April 21, 2009, 10:54:53 AM »
try this:


http://www.extremetech.com/article2/0,2845,1765358,00.asp


Quote
The white-LED mod will make the screen darker than with its original bulb. You can trick the screen to get brighter by bypassing a small component on the back of the board with a thin bit of wire as shown in Figure 4-31.

It's just above the center of the board, where you'll see 10 little surface-mounted components in a row. You want to bypass the third one from the left, labeled CV30. Since it makes the screen a lot brighter, perhaps too bright for some people's taste, I'd suggest bypassing the part instead of removing it, as you may wish to change it back. (It's your call.)



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Duo_R

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Re: Bacteria's IntoGrafx modding project
« Reply #14 on: April 21, 2009, 10:56:18 AM »
and the PAL turbos have a CXA chip???   :shock: :shock: :shock:

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