Backwards compattible?

2450 Views 22 Replies 16 Participants Last post by Xymet, May 24, 2005

Kushan

Discussion Starter · May 2, 2005

This is just a quick question to pass the time and I reckon I probably already know the answer, but I was wondering, since the PS2 plays like 99.999% of PS1 games (I think one game doesn't work lol), will the PCSX2 play PS1 games as well? When it's "finished" that is (For lack of a better term).

And if so, has anyone tried playing a PS1 game on the current builds?

Disclamer: This is out of curiosity, I'm well aware of PS1 emulators.

1 - 20 of 23 Posts

Valcrist

· #2 · May 2, 2005

no it doesn't there was a long explanation on the boards somewhere about this, but I don't remember where exactly, but the short answer is no.

XxCrashxX

· #3 · May 2, 2005

nope afraid not

the playstation 2 itself actually has 2 parts one that plays ps2 games and one that plays ps1 games the pcsx2 team is just attempting to emulate the ps2 side of the hardware.

edit: dangit Valcrist you beat me by seconds lol

Kushan

Discussion Starter · #4 · May 2, 2005

So that's a no, no-way and never or a "not right now"?

Coolsvilleman

· #5 · May 2, 2005

lol im pretty sure that a never ... until later. just use epsxe or another great emulator, why would you wana use the pcsx2 emulator if it ran the games slower than the ps1 emulators?

K-a-R-u-P-t

· #6 · May 2, 2005

Coolsvilleman: He never said he actaully wanted to use it to play ps1 games, he was just curious as to if they will ever emulate the ps1 with it, which is a no...

Betamax

· #7 · May 2, 2005

Alternatively you could try a my delta2 frontend, which supports both pcsx2 and epsxe. That'll more or less give you the desired result.

auMatt

· #8 · May 2, 2005

Actually , PS1 Emulation is handled by software on the PS2. So in theory PS1 games may work one day on PCSX2. The actual PS1 emulation is driven by the BIOS which will detect a PS1 disc being inserted into the PS2 and load the appropriate IRX that will run on the IOP(basically a PS1 on a single chip) , which in turns send all the display info to the GS for outputting. At the moment PS1 detection is turned off. Maybe one day it will be used if PS2 emulation is fully working.

auMatt

Samor

· #9 · May 2, 2005

interesting; I didn't know it worked like that; it sounds kinda like those retro tv-joysticks you can buy nowadays, which also contain one-chip designs...

General Plot

· #10 · May 3, 2005

In a way, if I remember correctly, the PS1 is actually hardware emulated on a real PS2, this being the reason why it is 99.99% compatible with PS1 games, and not 100%. I wonder if this feature was ever to become available in PCSX2, would that mean that playing a PS1 game in it would mean you'd be emulating within an emulator?

Kushan

Discussion Starter · #11 · May 3, 2005

I thought that the PS2's hardware was sort of built around the PS1 hardware? And that was why the PS2 only had 2 Controller ports, because if it had 4, it wouldn't play PS1 games or something.
I'm really not sure, I just vaugely remember reading something like that somewhere.

WindHydra

· #12 · May 3, 2005

I don't think it's build around PS1... PS1 is over 10 years old! And I'm sure the maker of PS2 are smart enough to disable extra controllers if a PS1 game is being played

Kane

· #13 · May 3, 2005 (Edited)

The PS2 IOP is the PSX processor, IIRC and the sound chip is fully compatible with the original one.

The reason for the 2 pad ports is merely because Sony are greedy bar-stewards.

CKemu

· #14 · May 3, 2005

Kane and auMatt are correct, and thats it really, enough said (esp given auMatt has 'extensive' knowledge on the subject, and is a great help to the team

)

I have heards some wacky theories in my time, but a PS2 built around a PS1....

Kushan

Discussion Starter · #15 · May 3, 2005

Well I didn't mean it like a sort of PS1 with bits added, I meant it pretty much like Kane said, certain components being designed to be compattible with the PS1 and stuff

EDIT: And just to reiterate, I read this somewhere a long time ago so dun blame me >_>

Xymet

· #16 · May 23, 2005

Kushan said:
Well I didn't mean it like a sort of PS1 with bits added, I meant it pretty much like Kane said, certain components being designed to be compattible with the PS1 and stuff

EDIT: And just to reiterate, I read this somewhere a long time ago so dun blame me >_>

In this thread its said that PS2 may have an intergrated PS software, mayb, sometime or later, the PCSX2 team will experiment on that but I think EPSXE or PCSX is good enough for emulating PSone games. Those are pretty cool emulators too with great speed and compaitability. Hey but we can all see when PCSX2 has finished right? Or you could use a dualprogram runner which would seem the same...... ( i remember reading about somestuff like that but well all c in time

) :hdbash:

BlackSun

· #17 · May 23, 2005

Hmm from pcsx2's change log:

[ Legend: ]
[ + Added feature ]
[ * Improved/changed feature ]
[ - Bug fixed (we hope) ]
[ ! Attention (Notes) ]

* 21/05/05:[-] More PS1 compat fixes
[!] Seems the GPU->GS is done by the PS1DRV, gotta find out more
(linuzappz)

* 19/05/05:[+] PS1 games kinda boot now as well

(linuzappz)

so , it seems that pcsx2 will "run" ps1 games

.. This isn’t strange... Since the whole ps1 compatibility is done by a part of ps2’s bios (ps1drv) so, if bios is correctly emulated, and iop is correctly emulated too, ps1 games should work

I hope this does not violate the rules... (From the cvs change log)

See less See more

KanedA

· #18 · May 23, 2005

hmmmm... doesn't PS2 use PS1 chip in it to 'do' something more than just run PS1 games??

Kane

· #19 · May 23, 2005

Kane said:
The PS2 IOP is the PSX processor, IIRC and the sound chip is fully compatible with the original one.

The reason for the 2 pad ports is merely because Sony are greedy bar-stewards.

KanedA: if you'd read not far up, you'd have got your answer.

KanedA

· #20 · May 23, 2005

sorry, that's becaus of 2 hrs of sleep I think...

1 - 20 of 23 Posts

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