ps1 one chip problem

Read again, the videomode changes it's an collateral effect of the bios patch to crack\bypass (call it what you want ) the bios protection and check....

 

I don't see the point of changing the video mode on powerup to bypass any checks / protections from the BIOS.
This thing is made for PAL machines only, so why should it switch from PAL to NTSC ? Only to boot NTSC games?
The games switch the video mode after the PS logo.

To me it looks like a good samaritan move from the coder since the NTSC video signal is better in terms of refreshrate (which makes no sense because there is nothing fancy in the BIOS) ... on the other hand, there is also PAL60, so I'm still confused about whats going on here.

A technical answer would be good ... Bad_Ad84 ?

 

I don't know the specifics of the check. But a guess would be, there is a check in the PAL bios that checks the video mode to see if it's different than start up (pal bios blocks ntsc Games by detecting video mode iirc). However, I guess it only checks one way as a PAL machines is assumed to always be pal. So by forcing ntsc it passes the check all the time and the game changes the refresh rate and video mode at boot.


Just a guess, as I have never looked at the psone bios. But it certainly seems like it's done to pass a Conditional check.

 

Well, I can assure you that I was not the only one that had problems with it. Maybe it was a stepping issue and the current chips work fine, but back when I tried it it definitely didn't work - the chips would work fine with MM3 or the Mayumi code, but failed with onechip. It wasn't the programmer since I tried several (including two that were official Microchip products) and it didn't make any difference - I also got another batch of chips with a different date code with the same result. And I tried adding decoupling, just in case the attempt to overdrive the ROM output was causing the chip to lock up, since that seemed like the only significant difference - this did actually help a little, but was still unstable.

On top of this, one of my friends who was selling chips (which were programmed using Microchip's ProMate II production programmer) got a very high level of returns on the 12F508s he shipped with the onechip code - even from people he had been selling chips to for a long time and who had never previously had any problems. Yes, I'm well aware that the devices are as far as the data sheet is concerned pretty much identical and they SHOULD work, but enough people were having problems with them in this application to make it clear that there was some sort of edge case that was making this not the case in practice.

 

I dont know where is the problem, maybe a chip batch...

The above answer was referred to dragonC, not you


iCEQB: We already wrote why onechip do this, can you understood? PAL PSONE have an aggiuntive protection in the bios that checks the region game with videomode... Guess? That's why the onechip force to change the videomode.
No good samaritan and other weird theories

 

Why should it do that? And where is the point here ? If it changes the video mode to (let's say) NTSC in order to boot NTSC games, it shouldn't boot PAL games anymore right?
So why not leave the video mode to PAL and boot both PAL and NTSC games, just like it manages to boot NTSC and PAL games with its forced NTSC mode.

Makes no sense to me tbh.

 

The chip patches only the bios side (all on the fly), not the gpu. In fact my psone with onechip boot ntsc games in color also with European composite (bleah!) cable.

Why use ntsc signal in a pal country? when pal it's better than ntsc in video quality

 

It doesn't matter on modern TVs, you're just getting PAL60 bios screens (if the TV doesn't support that then NTSC games wouldn't be playable either).
Patching the bios doesn't change the color encoding.

 

Actually some Tvs support ntsc but not pal60 over here (not for some time, but I have seen them years ago).

 

Because the NTSC color burst was carefully chosen to minimize bleed and dot crawl when used in a 60Hz / 525 line system. Same as the PAL color burst was chosen to work with 50Hz / 625 lines. Admittedly, modern TVs with digital comb filters exhibit these effects to a much smaller extent, but they are still there. The $0.02 explanation is that the frequencies were chosen so that they sat exactly between two successive harmonics of the frame rate, and if you use the "wrong" color encoding then this isn't the cae any more. This is, incidentally, why the South American PAL-M system (which uses a slightly different line frequency than NTSC) also uses a slightly different color carrier.

And since I'm being pedantic, I should point out that the only inherent advantage of PAL is that it much better at concealing phase errors in the transmission path (since they are in opposite directions in alternate lines and average out) - which is really not an issue when the transmission medium consists of a few meters of coaxial cable.

 

I wrote pal is better because, apart than the better frequency, PAL format have better colour stability because NTSC have some progectual problems.
BTW here in Europe we have SCART with RGB, the best for retroconsole

 

Go back and read what I wrote.

My point was precisely that the advantage PAL has over NTSC (reduced sensitivity to overall phase errors) is only relevant if you are going over a transmission medium (such as radio) that is likely to induce such errors - and that a composite signal fed over a coax cable directly between the source and the display does not fall into this category.

And, yes, I am perfectly familiar with SCART connectors - but this thread was talking about composite.

 

ops, you're right trimesh.

Really in this thread we was talking about onechip mod

 

Can you tell me which diagrams and code were used for this install

 

Can anyone play this game, or is it open to DragoonC only?

 

No only the most expert ones *trollface*
We are out

 

From what I gather the updated PIC12F629 asm code by garyOPA - 4-wire version, will not allow NTSC orignals with Anti-mod to play on PAL PSOne's

So new code for any Microcontroller (PIC, AVR, +?) is required to allow NTSC games with Anti-mod protection to play on PAL PSOne's.
or
ONEChip code for PAL PSOne's need a re-write for the newer and "cheaper" 12F6** chips (please add compatibles). To allow NTSC originals with Anti-mod code to play.

Because I am as cheap as chips ( ah ha ) - and want to program my own
( possibly more econimal to purchase from Bad_Ad84 ? )

10pcs PIC12C508A-04I/P DIP-8 = Approximately £8.35
http://www.ebay.co.uk/itm/10pcs-PIC...508A-ORIGINAL-MIC-DIP-8-Chip-IC-/171964298957

10Pcs PIC12F629-I/P DIP-8 = £3.69
http://www.ebay.co.uk/itm/10Pcs-MCU...29-I-P-12F629-I-P-12F629-NEW-CF-/272041592737

http://www.fatcat.co.nz
Prewired ONEchip (Stealth + BIOS Fix) ModChip (8 Wire)
1 chip @ NZ$15.00 each incl postage - roughly ~= £7.42 GBP + p&p

 

http://www.ebay.co.uk/itm/10Pcs-PIC...592814?hash=item3f56f147ee:g:J~sAAOSwqrtWnaU0

http://www.ebay.co.uk/itm/5Pcs-PIC1...592825?hash=item3f56f147f9:g:J~sAAOSwqrtWnaU0

Cheaper alternatives from china depending on how many u are planning to flash. U can get the MM3 code for 12f629 by searching google (not sure if I can give u links on here). There should be a Onechip code port out there aswell. Get the 12f629 because u can flash them over and over in case u get bad flash. I've used the MM3 code for 12f629, works on FF8, haven't checked it on Dino Crisis. Someone on here is working on their own modern code but i forget the name.

 

Thank you for your assistance Taijigamer2

Will be switching to a ATTiny45 and using PsNeeV6 developed by TheFrietMan

http://assemblergames.com/l/threads...p-for-all-ps1-models.57907/page-4#post-880583