Needed: Info on A1200 NTSC to PAL conversion - Page 2

Amiga1992 · 04 July 2008, 08:20

I would definitely use a low profile switch that doens't fuck shit up accidentally.

Anotehr question: certain softwares can switch between NTSC and PAL modes on teh fly. Woudl this work after the switch is installed?

Jope · 04 July 2008, 08:24

It will work, the pin only determines which mode the machine boots up in.

To be complete, you should also change the motherboard crystal to the correct one, PAL or NTSC, when doing this mod, but it is not 100% required. The timing will be slightly off otherwise. Monitors will sync to it just fine, but for example professional video equipment might tear frames.

Unfortunately I don't have the frequency here, but it should be listed in the A1200 schematics component list.

rkauer · 04 July 2008, 20:51

Quote:

Originally Posted by Jope

It will work, the pin only determines which mode the machine boots up in.

To be complete, you should also change the motherboard crystal to the correct one, PAL or NTSC, when doing this mod, but it is not 100% required. The timing will be slightly off otherwise. Monitors will sync to it just fine, but for example professional video equipment might tear frames.

Unfortunately I don't have the frequency here, but it should be listed in the A1200 schematics component list.

Hello, oh powerful moderator.

The NTSC crystal is 28.6363 MHz, PAL is 28.37516 MHz (from the top of my head, but anyone can confirm this).

But this is not sufficient. Also is needed to change a resistor/capacitor net around the video encoder. Too much hassle for a minor modification.

Zetr0 · 05 July 2008, 02:32

A1200 PAL Oscilators & Encoder (rev2b)

X1: 28.375160MHz
X2: internal rf output
7451: 4.433619MHz

Encoder
U38: VP101-3BA - 0530FPC^

hope that helps

Amiga1992 · 05 July 2008, 22:48

So you have to do all this for the machine to default in "PAL" or "NTSC"? Or are you talking about a proper system conversion?

Seems like too damnd much for the first one...

Zetr0 · 05 July 2008, 23:28

@Akira

the best bet would be to build a small box that connects to the Amiga Video, from this have the necessary gubbins to do PAL / NTSC, theres plenty available, like Svideo converters etc.

Amiga1992 · 06 July 2008, 00:30

I dont care about converting the output oto PAL or NTSC, I just want it to default in "PAL" mode (ie NTSC @ 50Hz), because most software runs on this way and I can't be arsed to get to the early boot menu every damned time. At first, and this was my beliefe, a switch was all that was needed, but the latest conversatons have confused me.

Even an internal jumper might be fine for me, I don't see any reason why I would like the macihne to default at 60Hz, except maybe if I connect it to an NTSC TV set, which I probably won't except on shows.

laser · 06 July 2008, 19:45

Quote:

Originally Posted by Akira

I dont care about converting the output oto PAL or NTSC, I just want it to default in "PAL" mode (ie NTSC @ 50Hz), because most software runs on this way and I can't be arsed to get to the early boot menu every damned time. At first, and this was my beliefe, a switch was all that was needed, but the latest conversatons have confused me.

Even an internal jumper might be fine for me, I don't see any reason why I would like the macihne to default at 60Hz, except maybe if I connect it to an NTSC TV set, which I probably won't except on shows.

do the hack...pin41 to 5v using the resistor..it works perfect...I guarantee...it doesn't need any crystal replacement...I don't know why Jope says that
your A1200 will boot in PAL by default
I dont know why you are confused

rkauer · 06 July 2008, 21:31

Simplifying the answer: no need to swap crystals and encoder surrounding. Needed only to a full conversion.

Only the switch hack for play games. PAL Amiga units are best candidates for this, since the "NTSC@50Hz" mode will become true "PAL-M".

paulo_becas · 03 May 2011, 17:34

Quote:

Originally Posted by laser

your A1200 NTSC will boot by default in PAL mode using the hack
the video output via composite video and RF will be NTSC ...(will not change)

the genuine hack is disconnect the pin 41 of the Alice chip...(default connected to ground)
and connect it to +5v using a 4.7k resistor

this hack is on aminet and include a high quality picture and warnings about the possibility of damage to your motherboard
I have this hack made on my A1200...and works perfect
also you can choice to boot PAL/NTSC with a jumper using this diagram:

ground / pin41 / 4.7k +5v

btw, if you are using a high power supply....I recommend the use of a 10k resistor instead

I can't find the hack on aminet, can you help me with this?

31 March 2019, 20:11

is there any video or pictures on the right way to do this mod. there are so many different explanations.

Thanks

Chucky · 01 April 2019, 07:42

Remember to change oscillator for a proper PAL conversion or CIA timings etc will be slightly off..

31 March 2019, 20:11	#31
dadstoy Posts: n/a	A1200 convert pal to ntsc boot up is there any video or pictures on the right way to do this mod. there are so many different explanations. Thanks

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04 July 2008, 08:20	#21
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,651	I would definitely use a low profile switch that doens't fuck shit up accidentally. Anotehr question: certain softwares can switch between NTSC and PAL modes on teh fly. Woudl this work after the switch is installed?

04 July 2008, 08:24	#22
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,910	It will work, the pin only determines which mode the machine boots up in. To be complete, you should also change the motherboard crystal to the correct one, PAL or NTSC, when doing this mod, but it is not 100% required. The timing will be slightly off otherwise. Monitors will sync to it just fine, but for example professional video equipment might tear frames. Unfortunately I don't have the frequency here, but it should be listed in the A1200 schematics component list.

05 July 2008, 02:32	#24
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	A1200 PAL Oscilators & Encoder (rev2b) X1: 28.375160MHz X2: internal rf output 7451: 4.433619MHz Encoder U38: VP101-3BA - 0530FPC^ hope that helps

05 July 2008, 22:48	#25
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,651	So you have to do all this for the machine to default in "PAL" or "NTSC"? Or are you talking about a proper system conversion? Seems like too damnd much for the first one...

05 July 2008, 23:28	#26
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Akira the best bet would be to build a small box that connects to the Amiga Video, from this have the necessary gubbins to do PAL / NTSC, theres plenty available, like Svideo converters etc.

06 July 2008, 00:30	#27
Amiga1992 Registered User Join Date: May 2001 Location: ? Posts: 19,651	I dont care about converting the output oto PAL or NTSC, I just want it to default in "PAL" mode (ie NTSC @ 50Hz), because most software runs on this way and I can't be arsed to get to the early boot menu every damned time. At first, and this was my beliefe, a switch was all that was needed, but the latest conversatons have confused me. Even an internal jumper might be fine for me, I don't see any reason why I would like the macihne to default at 60Hz, except maybe if I connect it to an NTSC TV set, which I probably won't except on shows.

06 July 2008, 21:31	#29
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Simplifying the answer: no need to swap crystals and encoder surrounding. Needed only to a full conversion. Only the switch hack for play games. PAL Amiga units are best candidates for this, since the "NTSC@50Hz" mode will become true "PAL-M".

01 April 2019, 07:42	#32
Chucky Registered User Join Date: Mar 2015 Location: Karlstad / Sweden Age: 52 Posts: 1,210	Remember to change oscillator for a proper PAL conversion or CIA timings etc will be slightly off..

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