Amiga 2000-b pal/ntsc switching help

hellacat · 24 May 2019, 19:33

Hi! Ive got an NTSC Amiga 2000 rev 4.2 with 2.04 ROMs and an agnus 8372 and I wanted to know what I need to switch between pal and ntsc.

I think from what I've heard I need 3.1 ROMs and a fatter agnus (ECS) and I'm all good but do I need the full ECS chipset? (Super Denise too?) And if I got a fat agnus do I for sure need 3.1 roms? Or can I switch fine with 2.04.
Some places say you can swap a jumper if you have a certan ocs agnus too I think.
What I'm looking for is the cheapest and easiest way to swap between pal and ntsc without janking it
Thanks!

Edit: ive actually found out that the 8372 is a fatter agnus! Do I just need ROMs now?

Jope · 25 May 2019, 20:06

You just need a piece of software to change the screen mode. What are you planning on doing?

Degrader or tude might be useful?

Marchie · 27 May 2019, 01:29

No, you don't need a super denise.

Jumper J102 will boot into PAL or NTSC with an 8372A Agnus (most other Agnus versions are dedicated PAL or NTSC).

3.1 ROMs allow you to hold down both mouse buttons on boot and choose PAL or NTSC (regardless of how you set J102). This will make the machine display a PAL resolution (and frame rate I think?) but won't change the timing of your actual machine. I don't know how this affects games, but if you're trying to genlock for example, you will need to change the crystal as well.

TjLaZer · 27 May 2019, 01:43

There are command programs to change modes. A command for the c: folder called NTSC and PAL.

hellacat · 29 May 2019, 17:12

Quote:

Originally Posted by Marchie

No, you don't need a super denise.

Jumper J102 will boot into PAL or NTSC with an 8372A Agnus (most other Agnus versions are dedicated PAL or NTSC).

3.1 ROMs allow you to hold down both mouse buttons on boot and choose PAL or NTSC (regardless of how you set J102). This will make the machine display a PAL
resolution (and frame rate I think?) but won't change the timing of your actual machine. I don't know how this affects games, but if you're trying to genlock for example, you will need to change the crystal as well.

Ok nice! Thanks!

Ive also got an a 2320 scandoubler. Do you know if it would be fine with mode switching?

Marchie · 30 May 2019, 02:27

I have an indie ECS and it copes fine with NTSC or PAL, hopefully the 2320 is the same.

Jope · 30 May 2019, 08:06

The 2320 supports PAL and NTSC just fine. Many VGA monitors will refuse to sync to 50Hz though.

Matt020 · 30 May 2019, 11:07

How should J102 be jumped for PAL and NTSC?

Malakie · 23 July 2021, 21:35

I read the forum and many speak of j102 controlling pal or ntsc.. I cannot find any such jumper.

Main board is A2000 rev 6, does have fat agnus 'A' etc.

But it is in PAL and I want to switch it to NTSC.

Help?

Rotareneg · 23 July 2021, 21:42

J102 is between the oscillator, CPU, and Agnus.

Malakie · 23 July 2021, 21:57

Quote:

Originally Posted by Rotareneg

J102 is between the oscillator, CPU, and Agnus.

Ahh I was looking for a literal jumper, not a pad jumper... Besides soldering it closed, anything else I should know? Someone said something about replacing the oscillator on another site ... this one is 28.35xxx and the one in the other image is 28.6xxxx

Is that critical to this issue?

I am going to solder the jumper closed then but if you know about changing that crystal and whether it is necessary...

Thanks for the help..

Rotareneg · 23 July 2021, 22:17

I don't have any personal experience with it, but from what I've read some timing sensitive software (some games, networking stuff, etc.) can have issues/glitches as the CPU and system timers will be running slower than expected with the jumper on NTSC with a PAL oscillator.

Malakie · 23 July 2021, 22:19

Quote:

Originally Posted by Rotareneg

I don't have any personal experience with it, but from what I've read some timing sensitive software (some games, networking stuff, etc.) can have issues/glitches as the CPU and system timers will be running slower than expected with the jumper on NTSC with a PAL oscillator.

Ahh yea that makes sense.. Looks like I will need to update that as well then.. damn...

Ok thanks, it is appreciated!

24 May 2019, 19:33	#1
hellacat Registered User Join Date: Nov 2018 Location: saint john new brunswick Posts: 3	Amiga 2000-b pal/ntsc switching help Hi! Ive got an NTSC Amiga 2000 rev 4.2 with 2.04 ROMs and an agnus 8372 and I wanted to know what I need to switch between pal and ntsc. I think from what I've heard I need 3.1 ROMs and a fatter agnus (ECS) and I'm all good but do I need the full ECS chipset? (Super Denise too?) And if I got a fat agnus do I for sure need 3.1 roms? Or can I switch fine with 2.04. Some places say you can swap a jumper if you have a certan ocs agnus too I think. What I'm looking for is the cheapest and easiest way to swap between pal and ntsc without janking it Thanks! Edit: ive actually found out that the 8372 is a fatter agnus! Do I just need ROMs now? Last edited by hellacat; 24 May 2019 at 20:51. Reason: Add agnus number

27 May 2019, 01:29	#3
Marchie Registered User Join Date: Jul 2016 Location: Sydney / London Posts: 589	No, you don't need a super denise. Jumper J102 will boot into PAL or NTSC with an 8372A Agnus (most other Agnus versions are dedicated PAL or NTSC). 3.1 ROMs allow you to hold down both mouse buttons on boot and choose PAL or NTSC (regardless of how you set J102). This will make the machine display a PAL resolution (and frame rate I think?) but won't change the timing of your actual machine. I don't know how this affects games, but if you're trying to genlock for example, you will need to change the crystal as well. Last edited by Marchie; 27 May 2019 at 01:41.

23 July 2021, 21:35	#9
Malakie Registered User Join Date: Jan 2020 Location: Wisconsin, USA Posts: 194	Where the heck is J102 for pal/ntsc switching on A2000? I read the forum and many speak of j102 controlling pal or ntsc.. I cannot find any such jumper. Main board is A2000 rev 6, does have fat agnus 'A' etc. But it is in PAL and I want to switch it to NTSC. Help?

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25 May 2019, 20:06	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	You just need a piece of software to change the screen mode. What are you planning on doing? Degrader or tude might be useful?

27 May 2019, 01:43	#4
TjLaZer Registered User Join Date: Sep 2004 Location: Tacoma, WA USA Age: 52 Posts: 1,915	There are command programs to change modes. A command for the c: folder called NTSC and PAL.

30 May 2019, 02:27	#6
Marchie Registered User Join Date: Jul 2016 Location: Sydney / London Posts: 589	I have an indie ECS and it copes fine with NTSC or PAL, hopefully the 2320 is the same.

30 May 2019, 08:06	#7
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	The 2320 supports PAL and NTSC just fine. Many VGA monitors will refuse to sync to 50Hz though.

30 May 2019, 11:07	#8
Matt020 Registered User Join Date: Dec 2009 Location: West Australia Age: 47 Posts: 210	How should J102 be jumped for PAL and NTSC?

23 July 2021, 21:42	#10
Rotareneg Registered User Join Date: Sep 2017 Location: Kansas, USA Posts: 324	J102 is between the oscillator, CPU, and Agnus.

23 July 2021, 22:17	#12
Rotareneg Registered User Join Date: Sep 2017 Location: Kansas, USA Posts: 324	I don't have any personal experience with it, but from what I've read some timing sensitive software (some games, networking stuff, etc.) can have issues/glitches as the CPU and system timers will be running slower than expected with the jumper on NTSC with a PAL oscillator.

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