Yeah, that makes sense - in that case presumably there is an IR receiver somewhere and that little board is just reading the IR stream and simulating pushing buttons on the controller.

Yeah, it's a Video CD player board - the CL680 is one of the original single-chip VCD player devices. I suspect that board marked "PS2DVD" is a modchip and the marking is just camoflage. The wires connected to the memory card socket are so the board can read the controller - the pins for the control...

At this point, unfortunately most of the CD drive mechanisms available on places like eBay are basically junk. The production stopped a long time ago and anything that gets put together now is most likely going to be using parts that are either recycled or were rejected back in the day for some reas...

It's easiest to base in on the main board type. PU-7 and PU-8 machines used either KSM-440AAM or KSM-440ACM PU-18 and PU-20 used KSM-440ADM PU-20 and PU-22 used KSM-440AEM PSone used KSM-440BAM You can freely interchange KSM-440AAM, KSM-440ACM and KSM-440BAM because the cables are the same The KSM-4...

One interesting thing is that it's using a mask-programmed 68HC05 - which would normally imply these were made in quite large quantities. Makes you wonder where they all went.

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...