From 3ac406b6f6bbf2598999e75f483af61fc640cd5f Mon Sep 17 00:00:00 2001 From: Leah Rowe Date: Thu, 26 Sep 2024 12:17:56 +0100 Subject: [PATCH] more clarification Signed-off-by: Leah Rowe --- site/docs/install/playstation.md | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/site/docs/install/playstation.md b/site/docs/install/playstation.md index 5e861f6..1aeea7e 100644 --- a/site/docs/install/playstation.md +++ b/site/docs/install/playstation.md @@ -169,16 +169,18 @@ on PAL consoles (and vice versa); RGB SCART can be used to mitigate the colour issue, but not the timing issue. The oscillator mod is the only solution for the timing issue. -The PAL GPU clock is roughly 53.2MHz, and divides by 12 to create the PAL +The PAL GPU clock is roughly 53.2MHz, and divides by 12 to create the 4.43MHz PAL subcarrier/colorburst signal; this is needed in composite video for example. -The NTSC GPU clock is 53.693175MHz, and divides by 15 to create the NTSC +The NTSC GPU clock is 53.693175MHz, and divides by 15 to create the 3.58MHz NTSC subcarrier/colorburst signal; ditto, this is used for NTSC composite video. On a PAL playstation, Sony woride 53.2MHz to both inputs, and on NTSC, wired 53.69MHz to both inputs; that means on NTSC machines, PAL games will run with a 3.579545MHz colorburst signal, and on PAL consoles running NTSC games, -the colorburst would be 3.55MHz. +the colorburst would be 3.55MHz. *Some* people suggest hardwiring a 4.43MHz +clock to the video dac/buffer on PAL consoles, thus creating what is called +a "PAL60" signal, but this is ill advised; ditto wiring 3.58MHz to it (NTSC50). On *most* consoles except very early launch/debug models, and *very late* slim models, the PAL clock is pin 192 on the GPU and NTSC is pin 196 on the GPU. @@ -193,6 +195,10 @@ and hook up 53.2MHz to it. The Dual Frequency Oscillator method is easier and therefore recommend, but you can do this other method, which I call *DO* (Dual Oscillator. Because it's two oscillators!) +By fixing the timings in this way, your region-free console will also have +correct timings, thus maximum game compatibility, and colours will always be +correct no matter what video cable you're using. + Modchips --------