I would draw the lines as Lines, not as Polygons. Especially in the 2nd and 3rd picture: With the render line command you get lines with constant 1 pixel width. When rendering the lines as textured polygons, then the line width would be rounded down to 0 pixels in some of the more distant polygons. ...

Okay, now I am really confused, and I think I do misunderstand or dont understand what you want to do. With "transparent polygon", I did mean the "transparent sprite" that you had mentioned, it doesn't matter so much if you render it as sprite or polygon. With synthwave grid you ...

The part about Using a "polygon as light source" is highly confusing. I am almost sure that you mean something else: For a light bulb you would very much want to think about the light source as a "point" (not a polygon) in the middle of the bulb. Or if you mean that you want to d...

Are you aware of the relevant stuff, like and

What do you want to do there?
Do you just want the direction (and distance/intensity) from the source, like for a candle or light bulb?
Or the actual polygon shape, like from a rectangular window?

For viewing SPU RAM and VRAM in the debugger data window, see help text: No$psx Debugger - General Debug Features

PCM output via reverb buffer is used in my VCD player. And, I am just working on a MP3 player, that'll also do that.

7.2V sounds unusually low, I thought the (official) PSone power supply would output fairly constant 7.5V. But the vibration motor would probably spin even if drops below 4V, just spinning a good bit slower. With the fuses, you have specifically checked that the 7-5V pin on the controller port is rec...

Schematics are here https://psxdev.net/downloads/SCPH-100_5th-Edition.pdf
Most obvious reason would be the fuse for the 7.5V supply.

Yes, test points aren't needed for anything. For what that chip is, when searching for "16pin" in psxspx, it seems to match this: GATE is IC706.Pin7/10 (16pin "118" (uPC5023GR-118) ;PU-18 .. PU-20 But there it's called "118", and the barely visible part number on your p...

I would search for broken solder points. Visually inspect the through-hole solder points on the PCB bottom side. And for SMD chips, try to push down the CPU, Main RAM, BIOS ROM chips, and check if things get better (or worse) when booting up while pushing down those chips. As far as I remember, the ...

What happens if you push the reset button while it hangs with black screen? That's just the plain console, without any expansion carts attached? Oh, and instantly switching it back on sounds like bad practice, I would wait 1-2 seconds betswen power cycles (just in case you literally meant "inst...

A modchip normally can't damage anything. I'd rather assume that you did have (or still have) produced a shortcut somewhere, wihich is 99% harmless and easy to fix, unless you had shortcut power supply signals. I guees the yellow diamond screen should come up even without cdrom drive attached. At th...

That's not a "pin", it's called "test point", and it isn't needed, and everything should work fine without it. If you want to wire a modchip to that signal, that signal is called WFCK, and there are lots of options for doing that: Scratch off the solder-stop on the PCB wire, use ...

Cool, glad that it's working (or bypassed). If you want to replace he fuse someday, there are schematics (with parts lists at the end of the document) for several older/newer PSX mainboards (see the Downloads section on top of the forum page). From what I've learned recently, only the rating in Ampe...

If you think that it's a fuse then you do need a multimeter to check if the fuse is broken, and if so, yes, that would require soldering. But, the controller and memory card are using the exact same signals and supply voltages, so it's pretty much implossible that one works & the other doesn't w...

I've looked through the files on the Programmer Tool CDROMs. And, yes, it's rather difficult to extract the BIOS ROM-images from there. There are at least two different file formats (neither one being raw ROM-images), and different BIOSes for different purposes, and different CDROM versions (which h...

Okay, I am impressed - I would have thought that it's hopeless to get that working on win2k. I've been looking through some of the older/newer SDK "Programmer Tool" CDROMs. And couldn't even find any dtl-2500 drivers on those discs: There is something called PSSN\WINDEBUG\H2700\*.VXD - and...

I've helped to install a 6 kW photovoltaik PV system with 18 panels. The PV components are a bit bigger than in DIY projects for digital electronics, and I didn't have any experience with PV, but it's been actually quite simple (and saved a lot of money). The whole thing consists of two strings, one...

Hmm, I just tried to send some constructive or motivating feedback, as far as possible without seeing your unreleased open source code. But if you want to make it faster, you'll have to do that yourself, I could only tell you how. Usain bolt can run 100 meters in just 9.58 seconds, can you ? Yes, pr...

The FTDI specs say that the chip could support 1Mbyte/s, so it looks as if you are doing something wrong. Are you executing your program code directly from ROM, in an uncached memory area? That would drop the CPU speed from 33Mhz to somewhere below 500kHz. Or are you reading/writing lots of USB cont...