This is a tutorial series that I've been working on and off for awhile. The goal of this series is to cover as much about programming various parts of the PS1 hardware as possible, using the PsyQ/Programmers Tool SDK or PSn00bSDK. There isn't much covered in the series currently, but it has some ext...

Just pushed out an update that adds FntOpen(), FntPrint() and FntFlush() functions and a bunch of small fixes today. I recommend reading the changelog in the repo for more details.

Development on this SDK is still going so far, despite this project being mostly quiet.

LoadImage/StoreImage always retains and overwrites the STP bits of pixels being read or written. 16-bit TIMs have STP bits in all pixels while 8-bit and 4-bit TIMs have the STP bits in the CLUT pixels instead. True black (0, 0, 0) is normally treated as the transparent color when drawn using texture...

You can use a DR_ENV primitive to change the active drawing area to some place outside your display/draw areas for off-screen rendering. This can be used as a way to accomplish render to texture based effects.

To get proper color modulation for textures, you'll have to use a method called CLUT fog, where you have multiple CLUT entries stacked vertically of the CLUT transitioning from its original colors down to a solid color of your fog. The CLUT selected is based on the depth of the polygon primitive. Cu...

IRQ10 is connected to both the IRQ pin on the controller ports and one of the pins in the Parallel I/O port. I even toyed with it with a slightly modified Xplorer that attaches one of the parallel port pins to the IRQ10 pin of the Parallel I/O port. Not sure if you can just feed it with 5v directly ...

The most efficient method I could come up with is to draw to a off-screen area using a DR_AREA primitive, then switch to your main drawing area with DR_AREA then draw the off-screen one as a 16-bit texture. The off-screen draw area should only be up to 256x256 as that's the maximum addressable textu...

The hardware cannot really scale the size of the picture shown on the screen. The closest you can get to accomplish such a thing is by a combination of choosing one of five supported horizontal screen resolutions (256, 320, 384, 512, 640) and one of two vertical screen resolutions (240 and 480 for N...

You need to install a VSync callback which will run a counter, and update a variable that will be your FPS from a variable that is updated constantly on every screen update. volatile int fps; volatile int fps_counter; volatile int fps_measure; void vsync_cb(void) { fps_counter++; if( fps_counter > 6...

You can adjust the picture position and size, using GsDISPENV.screen , which is a RECT struct. // Adjust picture position GsDISPENV.screen.x = 0; GsDISPENV.screen.y = 16; // Adjust picture size (amount of pixels shown, not image size) GsDISPENV.screen.w = 320; GsDISPENV.screen.h = 256; // This shoul...

You use GsINTER only if you set a vertical resolution greater than 256, such as 480 for NTSC and 512 for PAL.

You need to do AddSIO(115200) to replace the BIOS tty driver with a serial driver, so tty messages from printf are sent out to serial.

No, I'm not doing a scrolling background, just a sprite, remember... Just a SPRITE. Ah, I wasn't paying enough attention... My bad. Judging by what I've sifted through your code so far, it appears you're mixing libgpu and libgs stuff, but your main.c does not appear to be initializing libgs. Your t...

If you want to do a scrolling background, you'll also have to look into drawing tilemaps on the PS1. Basically, you're going to put together a tile sheet, then composite them together with a tilemap editor like Tiled (think that's the name of the open source tile map editor), and finally write a con...

Get it from the Programmers Tool CD 2.2 ISO in the Downloads page. That one has the copy of the toolchain that is all 32-bit.

The Programmers Tool CD is more or less PsyQ but several magnitudes cleaner and more organized.

I have the compilers fully working in 64-bit Windows 7.

Grab the Programmers Tool SDK ISO from the downloads page as that is a cleanest distribution of the SDK you can find. It also comes with all 32-bit copies of the toolchain (ccpsx, psylib and psylink), though psymake is still offered as a 16-bit DOS applcation. You can use make from Msys2 instead and...

I just tested 230,400 and 345,600 bauds with my FTDI and well, communications was still very unreliable. Bytes often kept getting missed and I end up with incomplete data, I'm not so sure about the integrity of what was received though. It could either be my wiring (I used old, probably rusty wires ...

I don't think this example is optimized enough to display flawlessly in hi-res mode, since hi-res operates in single buffer mode which demands 60FPS. I don't remember how I coded this demo exactly (its been so long) but you basically want to position both display/draw buffers to the same VRAM locati...

I think that is a limitation in the CD libraries of the PsyQ/Programmers Tool SDK. I never ran into an issue creating large images with multiple directory levels in MKPSXISO (though I usually test them by browsing the contents in Windows), didn't find any missing file problems with the most recent v...