Search found 529 matches

by nocash
February 26th, 2024, 1:44 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 12
Views: 20022

Re: SCPH-1002 BIOS corrupt.

I've converted the bios boot gui to EXE format and replaced the cdrom sector loading functions by a fixed logo and licence strings... so I could upload the EXE to the broken console without cdrom drive attached... doing that, it's now capable of properly displaying "Licensed by". Then, whi...
by nocash
February 26th, 2024, 1:18 pm
Forum: Graphics/GPU
Topic: Help with PS1 16bit tim image
Replies: 6
Views: 415

Re: Help with PS1 16bit tim image

Ah, I thought it was only one "TIM" file, and might exceed 2Mbyte after decrompression. Thanks for changing rar to zip. The tim's in there have all wrong colors, which is somewhat impossible for 16bit direct color. I'd assume that they are 4bit or 8bit (or a mixup thereof). The required pa...
by nocash
February 26th, 2024, 9:55 am
Forum: Graphics/GPU
Topic: Help with PS1 16bit tim image
Replies: 6
Views: 415

Re: Help with PS1 16bit tim image

That is a rar file, those are very hard to deal with, you would probably need the newest version of the rar software. But even then, given the size, what makes you think that it could contain a tim file???
by nocash
February 25th, 2024, 2:58 am
Forum: Sound/SPU
Topic: What are .SGG and .SFX files?
Replies: 2
Views: 269

Re: What are .SGG and .SFX files?

Look at the file headers, just having the extension is a bit meaningless. .SFX is supposedly short for Sound Effects and could mean anything. There might be some standard used in several games. But I am also sure that several people have used the abbreviation for different file formats. .SGG files a...
by nocash
February 24th, 2024, 2:12 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 12
Views: 20022

Re: SCPH-1002 BIOS corrupt.

The "ed by ed" issue seems to be popular on reddit http://www.google.com/search?q=psx+%22ed+by+ed%22+site:www.reddit.com I don't really understand how to browse that webpage... from what I can see, the problem occurs on both PAL and NTSC consoles (despite of the different GUIs), and they d...
by nocash
February 24th, 2024, 1:35 pm
Forum: Work Logs & Projects
Topic: Thesis about a PS1 Game Engine
Replies: 2
Views: 342

Re: Thesis about a PS1 Game Engine

The boot screen where it is saying "d" and "d" without PS logo, is that because you forgot to include the licence/logo sectors, or is it a hardware glitch (that also happens on retail discs)? And the game engine, are you writing own GTE code, creating your own linked lists, and d...
by nocash
February 23rd, 2024, 4:46 pm
Forum: Input/Output
Topic: SCPH-1002 BIOS corrupt.
Replies: 12
Views: 20022

Re: SCPH-1002 BIOS corrupt.

My oldest SCPH-1002 is now also saying "ed by ed by" instead of "Licensed by" when booting from CDROM. That is, when booting with the built-in BIOS, it does look exactly as in the first picture in first post above, and refuses to boot any further. Cleaning the lens and disc doesn...
by nocash
February 22nd, 2024, 2:36 pm
Forum: Sound/SPU
Topic: ADSR Behavior Consensus?
Replies: 5
Views: 820

Re: ADSR Behavior Consensus?

Just following up to say a big thank you - this writeup on the ADSR behavior is great - really straightforward compared to most other things I'd seen. Yipieh. I guess it was almost a bit too straightforward, lacking all those expected confusing descriptions ; ) I'm looking forward to your SPU test ...
by nocash
February 16th, 2024, 2:15 pm
Forum: General Chat & Messaging
Topic: PSX Vertex Colour and Texture Blending
Replies: 3
Views: 602

Re: PSX Vertex Colour and Texture Blending

The formula is A = B * C, but I don't know if or how you can implement that ; )
by nocash
February 12th, 2024, 12:52 pm
Forum: General Chat & Messaging
Topic: No streamed audio (hardware problem)
Replies: 8
Views: 1291

Re: No streamed audio (hardware problem)

Yes, KM62V256CL6-7L should be the same. I'll add that as another known chip in psxspx. The XA-ADPCM decoder chip would be CXD1815Q (Decoder/FIFO), but I don't know if/which/if any pins could cause ADPCM problems. I would rather not mess with that chip, or first check the CXD1815Q (or CXD1199AQ) data...
by nocash
February 11th, 2024, 2:20 am
Forum: Research
Topic: GPU Rendering Timings
Replies: 2
Views: 564

Re: GPU Rendering Timings

And rougly related: The GPU FIFO behaviour. The FIFO itself isn't so special, but the timings for removing and processing data from FIFO are quite complicated... The GPU uses a 16-word (64-byte) write FIFO for sending commands and parameters (and VRAM data) from CPU to GPU. FIFO Overrun Internally, ...
by nocash
February 11th, 2024, 1:54 am
Forum: Sound/SPU
Topic: ADSR Behavior Consensus?
Replies: 5
Views: 820

Re: ADSR Behavior Consensus?

Does this require much specialized hardware or knowledge? No, nothing special (other than having a way to run EXE files on the console, preferably without burning CDRs for each test). I've been reading the SPU section of psx-spx a ton over the last few days, but I haven't seen anything specifically...
by nocash
February 9th, 2024, 12:17 am
Forum: Research
Topic: GPU Rendering Timings
Replies: 2
Views: 564

GPU Rendering Timings

Here are the GPU rendering timings. All values are measured in 33MHz CPU clock cycles. The GPU can render up to 66 million pixels per second, that figure applies for monochrome Rects, textured Rects, and even for Rects with texture blending. Monochrome Polygons can also reach 66Mpix/s, however, the ...
by nocash
February 8th, 2024, 9:04 am
Forum: Sound/SPU
Topic: ADSR Behavior Consensus?
Replies: 5
Views: 820

Re: ADSR Behavior Consensus?

The best method is to emulate the SPU on the playstation itself. And then capture the real hardware's waveforms (from reverb buffer, or from the SPU status registers), and compare them against the emulated waveforms. A basic test would be to display the captured & emulated waveforms on the scree...
by nocash
February 7th, 2024, 9:40 am
Forum: General Chat & Messaging
Topic: No streamed audio (hardware problem)
Replies: 8
Views: 1291

Re: No streamed audio (hardware problem)

I think this is where I need to look? ( https://psx-spx.consoledev.net/pinouts/#pinouts-spu-pinouts ) Sorts of, that's some older/inofficial hack. The official doc is here http://problemkaputt.de/psx-spx.htm Either way, if you search for something like IC310, the doc should contain part numbers of ...
by nocash
February 7th, 2024, 7:33 am
Forum: General Chat & Messaging
Topic: No streamed audio (hardware problem)
Replies: 8
Views: 1291

Re: No streamed audio (hardware problem)

When you are saying streamed audio, do you mean compressed XA-ADPCM (as used for audio in most cut-scene movies)? Apart from the decompression, there isn't much of a difference between streaming XA-ADPCM and CA-DA from music CDs. So it's very weird that one works, and the other doesn't. The other th...
by nocash
January 31st, 2024, 7:16 am
Forum: Hardware
Topic: Need help to transcolde pal to ntsc scph 5552
Replies: 5
Views: 1247

Re: Need help to transcolde pal to ntsc scph 5552

Okay, fine.
by nocash
January 31st, 2024, 6:07 am
Forum: Hardware
Topic: Need help to transcolde pal to ntsc scph 5552
Replies: 5
Views: 1247

Re: Need help to transcolde pal to ntsc scph 5552

The existing pal/ntsc mods are mostly intended to run import games, not to convert the whole console from pal to ntsc. The latter would only make sense if you really like the challenge of doing overcomplicated or outright crazy things. But if you are up for that... For 60hz boot menu, replace the bo...
by nocash
January 31st, 2024, 3:03 am
Forum: Hardware
Topic: Need help to transcolde pal to ntsc scph 5552
Replies: 5
Views: 1247

Re: Need help to transcolde pal to ntsc scph 5552

Do you mean NTSC frame rate (60Hz), or NTSC color encoding (but what for)?

Anyways, to "stay" in NTSC, you may need to use a cdrom with an NTSC game on it.
by nocash
January 30th, 2024, 12:13 am
Forum: Homebrew (General)
Topic: Five Night at Freddy's PS1
Replies: 6
Views: 1327

Re: Five Night at Freddy's PS1

Cutting the image into smaller parts to match the texture page limits sounds just right.

I've managed to copy the gamejolt page link, https://gamejolt.com/games/FNAF-ps1/832993 and the download for the recent version should be at https://gamejolt.com/get/build?game=832 ... ld=1520775