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Thread: Apple II Platinum International NTSC 50 to 60HTZ

  1. #1
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    Apple II Platinum International NTSC 50 to 60HTZ

    This mod only applies to the Apple IIe Platinum International NTSC motherboard.

    Edit: When I say PAL i mean NTSC 50htz I've learnt a lot since I first wrote this gibberish. Most including myself say PAL referring to the region rather than its video standard. The Apple II line is confusing when it comes to its models.

    There's a nothing more annoying than wanting to sit down and play old school 8 bit games only to find out you have no colour in Pal due to stupid composite NTSC artifacting (google it).
    After doing hours of reading I now know why certain games on my XEGS as a kid like Lode Runner, Flight Simulator 2 didn't look right on my PAL system, you'd end up with like blue and orange bars (or something) instead of solid colours. The problem occurs on the Atari 8 bit due to these games being ports from the Apple II.
    I've been wanting to play Ultima III on my 130Xe but the picture is black and white I've ordered the Antic and GTIA chips to convert one of my XE's to NTSC but scored a minty 800 XL from the states in box for 63 USD, cheap!

    I bought a nice little JVC 13" monitor just to play NTSC games on my Atari and Apple 8 bits but when I tried my iic the other day...black and white and my IIe Platinum I just got today....B/W also
    Oddly for some reason the IIGS came out in NTSC composite, I guess Apple couldn't be bothered making a PAL version but why would you run the IIGS in composite when it outputs glorious RGB?..you wouldn't!

    After doing research all afternoon and sifting through conflicting articles I found a solution.
    If your motherboard is the International NTSC version with IOU 344-0022-A then your in luck, this is a 50/60 htz version of the chip. THIS page has it listed however they have the IC mixed up with the Apple IIc version 344-0021 which they have listed as 60htz but I'm sure seeing as my IIc is PAL they mean 50htz. Edit: I mean NTSC 50htz.

    In a nut shell we need to change the crystal at Y1 to a 14.31818 MHZ series resonant crystal.
    Apparently mouser part number 73-XT49U1431-S works, manufacturer part number XT9UNLANA14M31818

    Frequency:
    14.31818 MHz
    Tolerance:
    50 PPM
    Frequency Stability:
    50 PPM
    ESR:
    25 Ohms
    Drive Level:
    100 uW

    IMAG1084.jpg IMAG1083.jpg
    Well I ordered some crystals the other day when I had the idea to convert one of my XE's which happen to be exactly the same value I need here, since they haven't arrived I need to pinch one off my poor old spare Turbo XT motherboard.
    Picture on the left is the original crystal on the IIe Platinum board and right is my donor

    IMAG1090.jpg
    Now changed over

    IMAG1088.jpg IMAG1086.jpg
    Before and After. It's really hard to take clear pictures but rest assured the real thing's colours are much more vibrant and clear.

    Final thoughts and my unprofessional opinion.

    If you want to seriously get into Atari 8 Bit, get an PAL and NTSC machine, while you will use the PAL one more there are some games that use NTSC Artifacting which there's no point playing on a PAL machine.
    Last edited by Arcade King; 3rd September 2019 at 06:53 PM.

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    Did I read somewhere that Woz never did figure out why his PAL version of AppleII worked, at all?!

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    I'm not sure mate, I did read slot seven was dedicated to the PAL card.
    Those cards seem impossible to find so in my mind its easier just to convert to NTSC. I'd like to compare the colour difference myself.

  4. #4
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    I have a PAL card for my IIEuroplus. I'll try and get some pics. Yes it's in slot 7 with a single jumper wire going to the main board.


    Sent from my SM-G900I using Tapatalk

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    Great thread.

    I have the same motherboard in my Apple //e. I just repaired the switching power supply and now have a fully working system.

    I wasn't able to find a pal encoder card so I hope these work.

    http://www.ebay.com.au/itm/262591016751

    Not exactly cheap but what choice do I have and I don't have an old 386 lying around.

    They seem to be very similar in specs to the vishay/dale part

    http://au.mouser.com/ProductDetail/V...GClUokXQ%3d%3d

    http://au.mouser.com/ProductDetail/F...wA5pflfA%3d%3d

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    Quote Originally Posted by palindrome View Post
    Great thread.

    I have the same motherboard in my Apple //e. I just repaired the switching power supply and now have a fully working system.

    I wasn't able to find a pal encoder card so I hope these work.

    http://www.ebay.com.au/itm/262591016751

    Not exactly cheap but what choice do I have and I don't have an old 386 lying around.

    They seem to be very similar in specs to the vishay/dale part

    http://au.mouser.com/ProductDetail/V...GClUokXQ%3d%3d

    http://au.mouser.com/ProductDetail/F...wA5pflfA%3d%3d
    So how did you go?

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    The crystals arrived two days ago and was going to try it this weekend when I had time but after seeing your recent post I couldn't help myself so I gave it a shot.

    Unfortunately I don't have colour and I've tried my Commodore 1084S, Panasonic CRT TV and my TEAC CRT TV.

    The TEAC handles NTSC in colour as I've tested the composite out from my AV7000 Supergun to it.

    I'm wondering if I've missed something important or I probably need to try some other crystals.

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    is yours IOU 344-0022-A?
    Last edited by Arcade King; 5th July 2019 at 09:54 AM.

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    Apple II Platinum Pal 2 NTSC

    Yes. I probably need to order the right crystal for this.

    I am still getting a display though, just no colour.


  10. #10
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    I know this is an old post but recently scored 2 IIe's with the same motherboard and chip.
    Arcade king. Will this work on a LCD TV that supports NTSC or do I need an older CRT?
    I will try and find the crystals now and see how I go.

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