try your program on emulator, it's a lot faster to test this way then, from time to time, try your program on the real psx using a parallel cable + xplorer FX cart flashed with caetla or use a serial transfer cable (slower but easier to set up) I made a tutorial here for the xplorer fx part http://o...

have fun http://problemkaputt.de/psx-spx.htm#cpuspecifications
and here you have some opcode table: http://drhell.web.fc2.com/ps1/index.html

you should try to learn the assembler language and write some assembler code for the PS1 before writing an assembler yourself.
there are some asm source for PS1 on this page in the MISC section: http://hitmen.c02.at/html/psx_sources.html

well, maybe you should learn first what "assembler" is, because such opcodes doesn't exist.
assembler is related to the CPU of the machine, it has nothing to do with CD ROM which is another peripheral to which you talk through specific addresses.

would a PS1 game could have used the parallel port to get additional ram ?
was the parallel port intended for this use ? (because I doubt sony made the parallel port for action replay purpose ..)
it is strange that, no official hardware approved by sony use this port.

those "brand new" unit are Chinese made and very poor quality, I ordered one once and the spindle was too much pressed, it was rubbing very badly making a noise like on your video.
I just asked for a refund.
I finally bought a second hand psone and used the optical unit as a replacement.

the psx works mainly in 16 bits mode in 16bits mode you don't have 0-255 range you have 0-31 range (5bits, because 5bits * 3 (r,g,b) + 1 bits (transparency) = 16bits ) if you want to know the value of your color in 16bits, just divide your 0-255 value by 8, truncate the floating number and multiply ...

learn programming on psx
http://onorisoft.free.fr/psx/tutorial/tuto.htm

If this exploit also works on a real PS1, that would be nice for hacking a psone without a modchip.
You could write the special save on a memory card with an external USB adapter.
Too bad that the hacking method isn't explained in detail ..

try to bench it.
display 100 sprites with method 1 then using method 2, and measure it using the value returned by Vsync.

GsSortSprite_WithMethod1();
cpu_time = VSync(1);
DrawSync(0);
gpu_time = VSync(0);
GsSwapDispBuff();
...

composite signal is really the worst video signal.
you should try to find an RGB scart TV, you will get the best picture for the PS1

but, does that prevent you to flash the action replay ?
I thing I remember my action replay was not recognized and I could still flash it with the smallest Unirom version.

I'll have a look into making them at some point, but it's a lot of work just for a small handful of people to buy. If you were really serious about making games though, you'd go down the route of producing masters with a pressing company. Just make sure your game is up to quality standards though a...

I don't think that a CD factory would agree to reproduce this wobble protection, it might not be easy for them to do it on a glassmaster. also, due to region protection, it would be required to press 3 different disc .... which would cost way to much. (or maybe make a special wobble with all 3 strin...

I don't agree, bootdisc cannot be found that easily, sometimes on ebay but they are expensive (more expensive than a ps1 alone) A modchip is not easy to install for anyone ! First you need to have the adequate equipment, even for someone who has a soldering iron, the pins are so tiny on the ps1 boar...

Shadow > I don't think so, since I sell 10 times more on Dreamcast than on PS1 for the same game.
I hate gore, and 3D is way too much work on the PS1.
I think the PS1 suffer from it's protection system.
modchip can't be installed easy nowadays.

gwald wrote:The question is, is it actually running on PS1 hardware?

you will never know, unless the guy make a video showing the CD spinning on a real hardware.
but really, I doubt a Unity game could reproduce the 320x240 pixel look of it + composite video output glitches.

9 months later, 14 copies sold worldwide
that means no more homebrew on the ps1 for me
thanks to those who supported me anyway

yeah, I doubt crash bandicoot runs on a real playstation too, way too much polygons and details http://img2.game-oldies.com/sites/default/files/snaps/sony-playstation/crash-bandicoot-2-cortex-strikes-back-ntsc-u-scus-94154.png oh wait ... this Petscop game is totally doable on a PS1, there are many ...

This game was released on a Black CD-R complete in box with manual, but it's now sold out and I don't plan to produce more.