Search found 459 matches

by rama3
September 3rd, 2019, 6:58 am
Forum: Hardware
Topic: PSNee further development
Replies: 528
Views: 295307

Re: PSNee further development

It won't work.
Sadly, the NTSC-J bios is very different from the other regions.
It's likely that there isn't a routine in it that can be so easily fooled as the PAL / NTSC-U check.
by rama3
September 2nd, 2019, 12:22 am
Forum: Work Logs / Projects
Topic: FPGA Recreation of the GPU/GTE/MDEC
Replies: 12
Views: 892

Re: FPGA Recreation of the GPU/GTE/MDEC

Paulm probably meant it as a cost comparison, essentially saying that if you have an FPGA board, the price of a Xploder wouldn't be too bad. I agree with him on the psxdev side. Once you have the required hardware, getting homebrew to run isn't very time consuming. You need a virtual machine with th...
by rama3
August 26th, 2019, 10:58 pm
Forum: Work Logs / Projects
Topic: FPGA Recreation of the GPU/GTE/MDEC
Replies: 12
Views: 892

Re: FPGA Recreation of the GPU/GTE/MDEC

Hey, collaboration in PSX hardware projects happens sporadically and randomly. It would be best if you post your tasks / questions as publicly as possible, and then hope that someone takes them up ;p Your project requires knowledge from the most dedicated: Emu devs with hardware research focus. I be...
by rama3
August 22nd, 2019, 8:43 pm
Forum: General Chat / Messaging
Topic: Boot disk for japanese PS1
Replies: 4
Views: 420

Re: Boot disk for japanese PS1

On those sites you can also find a small app called something like "regionchanger". It allows you to set the licence data on a disk to any region you want.
I tested it and it works.
by rama3
August 17th, 2019, 11:23 pm
Forum: CD-ROM
Topic: PSX reads original discs but no backups
Replies: 5
Views: 441

Re: PSX reads original discs but no backups

They don't clone these, I don't think.
The effort for that wouldn't be worth the development costs, even back in 2001 or so when BAM models were current.

But if the drive looks similar to your ACM, no weird plastic remains everywhere and such, then it's fine.
by rama3
August 15th, 2019, 8:42 am
Forum: CD-ROM
Topic: PSX reads original discs but no backups
Replies: 5
Views: 441

Re: PSX reads original discs but no backups

Good call. The BAM is most likely new old stock and it'll work just fine in the 1002 unit. Just make sure to swap the top drive cover, removing the grey one and placing your old black one. If you've modified the pots on the mainboard, revert them to their original position. Just so you know, I've tr...
by rama3
August 9th, 2019, 4:01 am
Forum: General Chat / Messaging
Topic: New Member: Logan Jones
Replies: 29
Views: 1054

Re: New Member: Logan Jones

Good luck to you!

I've thoroughly abused my Exploder and Exploder FX (those names xD), and they can always be restored by some method.
by rama3
August 9th, 2019, 2:02 am
Forum: CD-ROM
Topic: PSX reads original discs but no backups
Replies: 5
Views: 441

Re: PSX reads original discs but no backups

Many 1002 series have an ACM drive (with the metal sled), but that doesn't mean too much. These drives still suffer from friction related material loss and thus, misalignment. They're just not as horrible as the full plastic AAM drives. It's possible that your drive starts working when you slightly ...
by rama3
July 27th, 2019, 3:15 am
Forum: Programming/CPU
Topic: Developing a better hardware region detection method
Replies: 2
Views: 282

Re: Developing a better hardware region detection method

Some sample choices a developer can make using the new method, if it works: - console is true NTSC > always use NTSC mode, disregard the region char - console is true PAL > no change, it's still probably best to choose PAL mode, disregard the region char - console is multiformat > this is new: use N...
by rama3
July 27th, 2019, 3:09 am
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

I've opened a thread for the default video mode stuff here:
viewtopic.php?f=41&t=3464

Please feel free to share your opinions! ;p
by rama3
July 27th, 2019, 3:00 am
Forum: Programming/CPU
Topic: Developing a better hardware region detection method
Replies: 2
Views: 282

Re: Developing a better hardware region detection method

One idea to try is to put the GPU into both (PAL, NTSC) modes, and measure the VBlank interval using a CPU timer. This should work, since the important difference between the 2 main system types is the GPU oscillator frequency. That oscillator is slightly faster on NTSC regions, slightly slower on P...
by rama3
July 27th, 2019, 2:50 am
Forum: Programming/CPU
Topic: Developing a better hardware region detection method
Replies: 2
Views: 282

Developing a better hardware region detection method

I'm proposing to develop a change in how homebrew software detects and adjusts to the different PSX models. Standard practice has been to look at a char in the kernel that marks a console as being NTSC-J (char: I), NTSC-U (char: A), or PAL (char: E). The practice is then to initiate the GPU with 60H...
by rama3
July 26th, 2019, 4:30 am
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

It may be a little off topic, but I wonder if it isn't possible to use some other video mode detection hint than the "E/A/I" char of the BIOS. One reason for this is that BIOS swaps are becoming more popular. Especially NTSC-J consoles really benefit from a PAL BIOS. I don't know of other "region bi...
by rama3
July 26th, 2019, 3:36 am
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

Nice, I knew it :D

The wait time is so-so overall, but then again, very little software would be 1.5 megs, right? :)

Oh by the way, the latest blog post link is slightly wrong, linking to https://github.com/danhans42/sioloader << "er" is bad :p
by rama3
July 25th, 2019, 7:50 am
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

I'm trying to find the "_sio_control" implementation in the psyq sdk, but so far no luck. It's kind of important ;p Edit: Uh oh, is the implementation using kernel routines? It's well documented how problematic the kernel is.. If that's indeed the case, the SIO stuff should be rewritten. And if the ...
by rama3
July 25th, 2019, 7:32 am
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

True, that was with the handshaking. Okay, so using an ESP8266 is actually a good recommendation. These dev boards are quite small, come with USB bridges, offer WiFi, and are cheap. I'd much rather use one of these, than pay FTDI and support their malware practices ;p Regarding software, it's probab...
by rama3
July 24th, 2019, 11:35 pm
Forum: Members Downloads
Topic: sioloader
Replies: 32
Views: 1500

Re: sioloader

It's not so much about genuine parts vs clones*, but the details of operation.
I think the PSX had an inversion step, right? It kind of feels like this is important with the speed limitations you see.

* At these low speeds. It would matter at several MHz.
by rama3
July 19th, 2019, 9:07 am
Forum: Work Logs / Projects
Topic: [DEV] - Flash Boot Rom PS1
Replies: 23
Views: 1680

Re: [DEV] - Flash Boot Rom PS1

Sure, and thanks :)
by rama3
July 19th, 2019, 9:04 am
Forum: Homebrew (General)
Topic: Newer X-Flash Builds
Replies: 54
Views: 6861

Re: Newer X-Flash Builds

The slower clock not working is probably a clock divider issue somewhere in the UART chain.
Not all hardware works well at all possible / standard baud rates.
345600 is 115200*3, 115200 being a very common value, so that should work :)
by rama3
July 19th, 2019, 1:45 am
Forum: Work Logs / Projects
Topic: [DEV] - Flash Boot Rom PS1
Replies: 23
Views: 1680

Re: [DEV] - Flash Boot Rom PS1

I'm also interested in a populated board! :) It'd be best with a 512kB chip, but 256kB is workable as well. The No$Cash BIOS is pretty well compatible, but only if the Memory Card fast access option is turned fully off*. I would want to use this 256k BIOS in my main machine, just because of the nove...