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/s...

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...

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 cau...

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 caus...

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 ...

Honestly, my guess is that you have two bad optical pickup assemblies, not least because they are by far the highest failure rate item on these consoles. I would recommend finding someone local that has a working SCPH-9002 (and doesn't mind you taking it apart!) and swapping the parts you have (PSU,...

Did you get these parts, or are you still looking for them?

Net Yaroze is very limited and expensive. Try to setup and install Psy-Q and compile some code . Then just run PS-EXE (.EXE) file with any working emulator. I prefer PCSXR, but you can use EPSXE or NO$PSX (god bless VRAM viewer!) Good luck :> I think the Yaroze is helpful for getting a quick start ...

You don't have to go back that far - a lot of the early P4 machines supported Windows 98SE too. They typically shipped with XP on them, but since during that time frame a lot of business users were still using 98 they still had support (and drivers) for it. More problematic, depending on the develop...

It shouldn't be a problem - I've written lots of stuff with the source split over multiple files. You could try compiling it manually to see if it's a problem with the build system - just use a command like ccpsx -g -Xo$80010000 file1.c file2.c filex.c -otarget.cpe cpe2x target.cpe Someone was worki...

The short answer is that on a PU-18 the modchip shouldn't interfere with reading the disc. On the older boards (PU-7, PU-8, PU-18, PU-20) the output data from the modchip is connected directly to the mechacon MCU as a digital signal and no connection is made to the analog side of the circuit. The on...

No, that's not normal - from the look of it, the chip has already been programmed with something - and since the 12C508 is an OTP device that means it's basically useless.

This approach seems great so far. About that CPU speed: I really don't know much about ROM reading yet but I assumed that OE pin was there to signal that data is ready. Shouldn't this enable us to deliver the data at the speed we want? The signal you want is conventionally called WAIT - but in the ...