So I guess if it helps any, here's 0x80012D74 and 0x80013278 to follow for more clues? You my friend have provided me with a far better understanding of where im at ^^ cheers! Oh and yes eeproms or flash ic's have a cmd to enable write and so forth. its specific to a series of the ic's. So all i ne...

Tricky one, but I've wondered this also - would be nice if there was a "R1 - COPY MAIN MEM TO EEPROM" or similar. The XFlash .exe decompiles quite cleanly in IDA, so maybe you could find a way to upload the ROM elsewhere into RAM first then patch XFlash to use that RAM instead of its own ...

I think i figured out another way to add external storage to the psx. #include <stdio.h> #include <sys/file.h> #include <sys/types.h> #include <kernel.h> #include <libgte.h> #include <libgpu.h> #include <libetc.h> #include <libapi.h> #include <libmcx.h> /* from BlackBag/Nagra PSX 0x1f801040 - unsign...

Thanks Shendo ^^, im happy to have stumbled across this post. This will help me further with my psx adventures; Im a "hardware" guy but i love software too. So hopefully with this tool i can study my own bios (ik theres ones around..) further so i can understand this system better lol. +1

Whoa cool stuff dude :D Keep doing that, i've also had on my mind making such reprogrammable "diskette" with EPROM just to test my demos. However i cannot help you yet :/, sorry. Regards. lol its okey if u cant help as of now. im kinda stuck were im at for now, until i can figure out what...

The Parallel prt is is a sort of a faux name. It's really an expantion port. Any device connected to this port will have access to everything on the local bus. The address that the PIO port resides on is from 0x1f00_0000- 0x1f00_ffff The following is a pin diagram of the PIO. 0x1f80_10d0 DMA channe...

UPDATE: 9/27/15 School has slowed down a bit, so i actually have time to spend here on psxdev.net ^^. I've already have been studying how to manipulate hardware in C and a few ways to properly write c. Its been very fun for me and now that i have time im starting back up on SIOFlash. I've already c...