Welcome, Guest. Please login or register.

Author Topic: Tuturial to convert a PAL A1200 to Native NTSC A1200  (Read 7502 times)

Description:

0 Members and 2 Guests are viewing this topic.

Offline kipper2kTopic starter

  • Newbie
  • *
  • Join Date: Feb 2011
  • Posts: 32
    • Show only replies by kipper2k
Tuturial to convert a PAL A1200 to Native NTSC A1200
« on: February 18, 2011, 08:10:28 PM »
Thought i'd share this, its tried and tested to work good...
 
A1200 PAL to NTSC Conversion (this is on a Rev 2B PAL board). A NTSC board can also be swapped over to PAL bt you will obviously have to find a few more components.
 
The following tutorial will explain how to convert a PAL A1200 to a NTSC native A1200
Items that must be altered
 
(T) = top
(B) = bottom
 
- Remove R245 (B)
- Add R246 (T) 2.7K
- Change X1 (T) to a 28.6363MHz oscillator
- Remove Y451 (T)
- Remove C244 (B)
- Add R203 (B) 0 ohm resistor
- Add R225 (B) 0 ohm resistor
- Change R221 (B) to 1.2k
- Change R223 (B) to 1.2k
 
 
Items that may be required to alter
 
C243 removed (T)
L241 removed (T)
Q461 removed (T)
Z221 removed (T)
R243 removed (B)
R244 removed (B)
C244 removed (B)
 
Just altering the upper list of components was enough to convert to NTSC. the lower list will remove extra components from the Pal goodies section of the motherboard that don't appear to be necessary.

enjoy
 

Offline brianb

  • Full Member
  • ***
  • Join Date: Jan 2009
  • Posts: 175
    • Show only replies by brianb
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #1 on: February 18, 2011, 09:56:04 PM »
Hmm...  I think I'll just hold down both mouse buttons on start-up instead...
 

Offline XDelusion

  • Alien Breeder
  • Hero Member
  • *****
  • Join Date: Mar 2002
  • Posts: 5089
    • Show only replies by XDelusion
    • http://starwarslegacy.net/
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #2 on: February 18, 2011, 11:56:17 PM »
This is sooooo much easier with Atari 8-bits, or at least taking an NTSC one to PAL is. All you gotta do is replace the Antic chip with a PAL one. I'm sure that works both ways, though....

I've NO idea why anyone would want to go from PAL to NTSC considering that 99% of the software is PAL. Hence the reason I bought a PAL Amiga even though I live in the land that was previously known as America.
Earth has a lot of things other folks might want... like the whole planet. And maybe these folks would like a few changes made, like more carbon dioxide in the atmosphere and room for their way of life. - William S. Burroughs
 

Offline kipper2kTopic starter

  • Newbie
  • *
  • Join Date: Feb 2011
  • Posts: 32
    • Show only replies by kipper2k
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #3 on: February 19, 2011, 01:38:22 AM »
Quote from: XDelusion;616486
This is sooooo much easier with Atari 8-bits, or at least taking an NTSC one to PAL is. All you gotta do is replace the Antic chip with a PAL one. I'm sure that works both ways, though....
 
I've NO idea why anyone would want to go from PAL to NTSC considering that 99% of the software is PAL. Hence the reason I bought a PAL Amiga even though I live in the land that was previously known as America.

 
 Yah, i agree.  Nice thing is though you can convert your NTSC to PAL doing the opposite
 

Offline giZmo350

  • Lifetime Member
  • Hero Member
  • *****
  • Join Date: Apr 2005
  • Posts: 2055
  • Country: 00
  • Thanked: 29 times
  • Gulfport, Miss
    • Show only replies by giZmo350
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #4 on: February 19, 2011, 02:02:40 AM »
Quote from: xdelusion;616486
even though i live in the land that was previously known as america.


you got that right!!!!
A500: 2MB Chip, 8MB Fast, IndiECS, MiniMegi, IDE4ZorroII on Z-500, KS1.3/KS3.1, WB3.1&BWB
 
A2000HD: 2MB Chip, 128MB Fast, P5:Blizz 2060@50MHz, PCD-50B/4GBCF, XSurf100, RapidRoad, IndiECS, Matze RTG, MiniMegi, CD-RW, SunRize AD516, WB3.9
 
A1200: 2MB Chip, 64MB Fast, 4GBCF, GVP Typhoon 030 @40MHz w/FPU, Subway USB, EasyNet Ethernet, Indi AGA MKI, FastATA MK-IV, Internal Slim CD/DVD-RW, WB3.5

Surfing The Web With AMIGA Is Fun Again!
 

Offline RobertB

  • VIP / Donor - Lifetime Member
  • Hero Member
  • *****
  • Join Date: Jun 2005
  • Posts: 1834
  • Thanked: 23 times
    • Show only replies by RobertB
    • http://www.dickestel.com/fcug.htm
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #5 on: February 19, 2011, 02:04:07 AM »
Quote from: kipper2k;616459

- Remove R245 (B)
- Add R246 (T) 2.7K
- Change X1 (T) to a 28.6363MHz oscillator
- Remove Y451 (T)
- Remove C244 (B)
- Add R203 (B) 0 ohm resistor
- Add R225 (B) 0 ohm resistor
- Change R221 (B) to 1.2k
- Change R223 (B) to 1.2k

Hmm, years ago when ACS was open in Sacramento, I had a PAL A1200 converted to NTSC by owner/tech Jim Sutherland.  He told me that he changed one resistor and cut 4 traces.  It worked!

However, a few months ago TOGA tech Duncan M. told me that was not right.  Maybe what he meant to say was that it was not a complete conversion.  Perhaps you're list of changes above is more complete.

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/
Southern California Commodore & Amiga Network
http://www.sccaners.org
 

Offline brenry

  • Newbie
  • *
  • Join Date: Mar 2011
  • Posts: 42
    • Show only replies by brenry
Re: Tuturial to convert a PAL A1200 to Native NTSC A1200
« Reply #6 on: April 06, 2011, 03:58:36 AM »
I recently got my PAL a1200 in the mail. Is there a bootfile I can edit to select NTSC by default like an autoexec.bat without going into bootmenu each time before going to CLI?

I really don't like the way these games sound.  I grew up with fast tempo tracks like Outrun and Last Ninja, and it just does not sound good to my ear in 50 fps PAL, the game play is smoother in 60 fps ntsc mode, and I hate dicking around with my screen adjustment controls when pal mode is active all the time.
« Last Edit: April 06, 2011, 04:13:32 AM by brenry »