Force NTSC on PAL a1200

Dreamcast270mhz · 21 December 2009, 04:54

Hey is it possible to get a pal a1200 to force ntsc modes on bootup? I've been using the mono composite, but every time I boot up, it is in PAL modes, which my tv cant center. After selecting an NTSC mode, I do what I want, then reboot. It is PAL again. I don't have a mouse, so I can't get to early startup menu. is there a parameter i could change or a mod I could perform to allow this?

Rebel-CD32 · 21 December 2009, 05:02

Do you have a Sega Master System or Genesis control pad? If you do, plug it into the mouse port and hold down buttons 1&2 or B&C, which will bring you the early startup menu. Then you can use the keyboard to move the pointer around the screen by holding one of the Amiga keys and using the arrow keys, with Shift to accelerate, Left Alt+Left Amiga is Left Mouse button (or button 1/B on the Sega pads) and Right Alt+Right Amiga is Right Mouse button (or button 2/C).

Unfortunately every time you press one of the keys, it will switch between PAL and NTSC mode, so just make sure you press a key to turn it to NTSC after you have chosen NTSC from the Display Options menu. I'm not sure if either option overrides the other, but just make sure both the option and the screen itself are NTSC before you press the button to boot (might be best to use the controller rather than a key to click the buttons).

Dreamcast270mhz · 21 December 2009, 06:25

thanks rebel, now I've managed, through simultaneous use through my gender changer and teh composite, I now have set my amiga to use a dbl ntsc screenso VGA will be okay on my monitor. Now, i don't need a CGA to VGA converter.

rkauer · 21 December 2009, 15:03

There is a hardware solution to force NTSC from PAL machines and vice versa: removing/adding a resistor to Alice pin #41 (yeah, the same old trick from A500/2000).

Only on A1200/600 the resistor is a SMD unit soldered on motherboard.

Check A1200's schematics.

alexh · 21 December 2009, 15:16

Quote:

Originally Posted by Dreamcast270mhz

Now, i don't need a CGA to VGA converter.

You'll need it for games surely?

Dreamcast270mhz · 21 December 2009, 18:56

Quote:

Originally Posted by alexh

You'll need it for games surely?

No games for me at the present, focusing on getting 3.1 on it, fixing my 2500 and fixing/ installing my 3640 in my 3000.

21 December 2009, 04:54	#1
Dreamcast270mhz Die Copyright holders!!! Join Date: May 2009 Location: White Stone, Virginia, USA Posts: 84	Force NTSC on PAL a1200 Hey is it possible to get a pal a1200 to force ntsc modes on bootup? I've been using the mono composite, but every time I boot up, it is in PAL modes, which my tv cant center. After selecting an NTSC mode, I do what I want, then reboot. It is PAL again. I don't have a mouse, so I can't get to early startup menu. is there a parameter i could change or a mod I could perform to allow this?

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21 December 2009, 05:02	#2
Rebel-CD32 Amiga will never die! Join Date: Nov 2004 Location: Gold Coast, Australia Age: 32 Posts: 455	Do you have a Sega Master System or Genesis control pad? If you do, plug it into the mouse port and hold down buttons 1&2 or B&C, which will bring you the early startup menu. Then you can use the keyboard to move the pointer around the screen by holding one of the Amiga keys and using the arrow keys, with Shift to accelerate, Left Alt+Left Amiga is Left Mouse button (or button 1/B on the Sega pads) and Right Alt+Right Amiga is Right Mouse button (or button 2/C). Unfortunately every time you press one of the keys, it will switch between PAL and NTSC mode, so just make sure you press a key to turn it to NTSC after you have chosen NTSC from the Display Options menu. I'm not sure if either option overrides the other, but just make sure both the option and the screen itself are NTSC before you press the button to boot (might be best to use the controller rather than a key to click the buttons).

21 December 2009, 06:25	#3
Dreamcast270mhz Die Copyright holders!!! Join Date: May 2009 Location: White Stone, Virginia, USA Posts: 84	thanks rebel, now I've managed, through simultaneous use through my gender changer and teh composite, I now have set my amiga to use a dbl ntsc screenso VGA will be okay on my monitor. Now, i don't need a CGA to VGA converter.

21 December 2009, 15:03	#4
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 47 Posts: 3,477	There is a hardware solution to force NTSC from PAL machines and vice versa: removing/adding a resistor to Alice pin #41 (yeah, the same old trick from A500/2000). Only on A1200/600 the resistor is a SMD unit soldered on motherboard. Check A1200's schematics. __________________ Amigan since 1989 Known drunk since 1982 (don't know quite well, I was drunk) 13 Amigas at home Finally a Z3 one! I'll stick with 'Cachaça do Inter' for this week: Chivas gives headaches! :D

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