That looks more like a linker error than anything from the preprocessor.

You can try looking on Orion's website at http://onorisoft.free.fr/psx/tutorial/tuto.htm - he's got some helpful information on how to develop for the PSX using less ancient OSes

The lockups when running Unirom sounds like a weak optical drive. I would tend to say the other stuff is related to the drive too, but I can't explain the problems with running the images in an emulator that way. One thing to note is that the CD drive in the PSX is an old design and has a fixed gain...

There is no pinout for the GTE, because it's not a separate chip. It's implemented as part of the main CPU, and it's not even possible to monitor the signals to it because it's on the R3K coprocessor bus which isn't bought out to pins on the package. Thanks very much for the information. I meant th...

I've never been able to find one. There is a a cleaned up and more legible version of the manual that was done by nocash: http://www.psxdev.net/forum/viewtopic.php?f=49&t=1312&p=12998&hilit=SCPH+5500#p12998 There is no pinout for the GTE, because it's not a separate chip. It's implemented as part of...

You always have to wait for the int before sending another command or it just gets dropped on the floor. If the last int hasn't been cleared, the HC05 just throws the command away.

Yeah, you can just connect it to the WR/ signal on the CPU - note that there are 2 of them and the one you want is SWR0/, which is on pin 100 of the CPU.

Thanks i'll try that. Still i was wondering if one was better than the others. They are all pretty much equivalent in this application - the part of the code that carries out the actual modchip function is the same. For a non-PAL console, there is no need to connect the wire from pin 3 of the PIC t...

Maybe the inline assembler doesn't like an implied offset of zero - try changing ($4) to 0($4) to make the zero offset explicit

This code is one of the first things that i tested. Thanks! But i have a maybe dumb question. Can we use LoadBS() and sort TIM's and/or work with frame buffer at the same time? Here is the example from "Duke Nukem: Time to Kill": https://www.vizzed.com/vizzedboard/retro/user_screenshots/saves15/155...

It's looks more like a problem with Taiyo Yuden disc - lol. Sony Lead Data/MBI and Ritek discs works better. Anyway thanks for clarifying and help. Right now starting game copy from BIOS ends with "Please insert PlayStation disc". Too long wires? Did you have the drive cover open when the console w...

I think the position you have the chip is fine - the problem is that the PM-41(2) is known to be extremely sensitive. As rama said, sometimes adding decoupling to the cap helps - you can also try adding a cap (say another 0.1uF) in series with pin 6 to act as a DC block. Sometimes that helps, someti...

Yeah, slow loading can certainly be caused by a bad CD assembly. Depending on what you mean by "bad condition", it might be worth cleaning the optical pickup assembly - if the unit was stored in dusty conditions, it might have dust on the turning mirror inside the pickup, and that can cause the rea...

Yeah, slow loading can certainly be caused by a bad CD assembly. Depending on what you mean by "bad condition", it might be worth cleaning the optical pickup assembly - if the unit was stored in dusty conditions, it might have dust on the turning mirror inside the pickup, and that can cause the read...

Okay, I have modchip inside of PSone with older board. Does wire lenght matter only for booting, or it could affect also reading disc during game? Also it's stealth install. https://i.imgur.com/ZyTTr4K.jpg It's not beautiful, but it works. The thing is, I have a feeling that it struggles a little m...

That makes sense now. Assume the mapping of the switch into ROM is done by the GAL/PAL? I only have 256k flash parts on hand anyway so that shouldn't be a problem. I do remember you looking at the AR carts and USB transfer a while back..do you know how hard would it be to implement the contents/map...

Thanks Trimesh, I shall give this a go. The seller of the PSone on eBay mentions running Caetla - by patched would I be able to just flash caetla? Would I be correct in assuming that if I use a supported flash part, and wire up W/E I should be able to flash it using xflash? Thanks My guess is that ...

Electrically, it's pretty simple - most of the pins are identical to the ones used on the boot ROM with the exception that CE/ has to go to pin 98 of the CPU (the boot ROM goes to pin 97) - data, address and OE/ go to the same places as the corresponding signals on the boot ROM. The code you put in ...

damiank94 wrote: ↑

March 8th, 2019, 8:43 pm

So, Mayumi and Multimode also didn't release pin 6? That sucks. I asked some people around with newer motherboard with modchips about that.

I have no proof of this, but based on examination of the code I think the code that supports PU22/PU23/PSone in both MM3 and ONEchip was copied from Mayumi 4

It should work - the boot ROM patch on the ONEchip is separate from the modchip functions and you can use either of them on their own. Having said that, I'm not sure it will actually work any better, since the actual code in the ONEchip that does the modchip function is pretty much identical to the ...