Original upload date: Sun, 02 May 2021 00:00:00 GMT
Archive date: Sat, 04 Dec 2021 11:08:55 GMT
Spyro 3: Year of the Dragon has also a problem with the DECKARD IOP emulation and it was not confirmed by Sony to have issues.
The frame drops are very rare, so it probably wasn't noticed.
It's best n
...
oticable in the fireworks factory at the Demo mode.
On the left side is the V13 (SCPH-70004) with the PS1 CPU and on the right side the V17b (SCPH-90004) with the DECKARD IOP emulation.
It was compared side by side frame-accurate.
At about 0:33 you can see the fps drop on the right and then the time offset.
The game is playable fine.
These PS2 models are affected:
SCPH-75001 / SCPH-75004 / SCPH-750XX ...
SCPH-77001 / SCPH-77004 / SCPH-770XX ...
SCPH-79001 / SCPH-79004 / SCPH-790XX ...
SCPH-90001 / SCPH-90004 / SCPH-900XX ...
Sony - Incompatibility lists:
European PS1 games:
List 1:
https://archive.org/download/75000-series-1-en-gb/75000_series_1_en_GB.pdf
List 2:
https://archive.org/download/75000-series-1-en-gb/75000_series_2_en_GB.pdf
European PS2 games:
List 1:
https://archive.org/download/75000-series-1-en-gb/75000_series_3_en_GB.pdf
List 2:
https://archive.org/download/75000-series-1-en-gb/75000_series_4_en_GB.pdf
American list (Web Archive):
https://web.archive.org/web/20100309031347/http://us.playstation.com/news/consumeralerts/softwaretitles_75001/index.htm
Japanese list (Google translated):
https://translate.google.com/translate?hl=en&sl=ja&tl=en&u=https%3A%2F%2Fwww.jp.playstation.com%2Finfo%2Fnotice%2Fnt_20051020_scph75000.html
Unofficial Wikipedia list:
https://en.wikipedia.org/wiki/List_of_PlayStation_games_incompatible_with_PlayStation_2
The problem is that Sony replaced the PS1 CPU (MIPS R3000A Custom) since the SCPH-750xx V14 model with a PowerPC 405 RISC CPU.
The PS1 CPU was clocked at 37,5 MHZ and was used as IOP (Input / Outpout Prozessor).
For PS1 Emulation it clockes down to 33,8 MHz.
Since the named models, it was emulated (DECKARD IOP) by the PowerPC CPU.
This caused problems with PS1 and PS2 games.
Sony fixed some PS2 titles since the SCPH-770xx V15 models, but they not fixed the problems with the PS1 emulation.
You can see if your console is using the DECKARD IOP emulation at your model number, or just look if you have the PlayStation Driver 2.00 in the browser.
More games can be causes issues.
Audio source in the video is from the V13.
#ps2 #deckard #emulation