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Thread: LumaTOLB - LumaFix with TOLB combo

  1. #1
    eslapion's Avatar
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    Default LumaTOLB - LumaFix with TOLB combo

    LumaFix and TOLB combined in a single board called LumaTOLB.

    The size and design of this board also finally allows boards 326298, 250407 and KU-14194 to have a new clock generator in a simple little board which fits neatly under the VIC-II. Designed to meet the tight space constraints of these C64 boards. It will also work well with all other C64 boards; 250425, 250466, SX-64 and C64 reloaded MK1. Available in NTSC or PAL flavors.

    Chroma attenuation for normal S-Video levels is done with a fixed resistor instead of a potentiometer. You can cut a jumper to restore the full chroma amplitude for Commodore monitors/LCA cabling.

    Price is 20 Euros (24$US) plus shipping.
    Shipping a small packet (up to 8 units) to the US is 8$US. Shipping cost for Australia/NZ and South America is 10$US, Europe is 8 Euros.

    Assembled unit

    Click image for larger version. 

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    Click image for larger version. 

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    Last edited by eslapion; 25th July 2018 at 06:55. Reason: update to US-EUR value

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    8 Bit Dreams DjCook's Avatar
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    very interesting product, well done eslapion!
    repairs of retro computers & hardware in Germany

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    Amiga Noob Amon_RA's Avatar
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    Awesome news!

    I installed a Lumafix64 a few days ago in my C64 Reloaded MK1, took half an hour to perfectly adjust the image... only to find out the keyboard wouldn't fit anymore in my new C64C case!

    I was playing with the idea to swap the ZIF socket with a normal PIN socket to gain a bit of space to fit the Lumafix64, but this seems like a better solution.

    Will definitely buy a couple when they become available.

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    eslapion's Avatar
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    I am pleasantly surprised by the reception. Very encouraging.

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    Do you still need the 8701 IC in the computer or does this just by pass it? I grabbed your one and only PAL TOLB from WoC last month. Works great in my recently converted NTSC to PAL machine. I should have nabbed a LumaFIX as well.
    Last edited by DigitalMan; 9th January 2018 at 20:17.

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    eslapion's Avatar
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    Quote Originally Posted by DigitalMan View Post
    Do you still need the 8701 IC in the computer or does this just by pass it? I grabbed your one and only PAL TOLB from WoC last month. Works great in my recently converted NTSC to PAL machine. I should have nabbed a LumaFIX as well.
    TOLB completely eliminates the need for the 7701/8701 so it's the same for LumaTOLB.

    I'm glad your PAL TOLB works well for you.

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    Amiga Noob Amon_RA's Avatar
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    Quote Originally Posted by eslapion View Post
    TOLB completely eliminates the need for the 7701/8701 so it's the same for LumaTOLB.
    What happens when you leave the 8701 in its socket and install the LumaTOLB under the VICII?

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    eslapion's Avatar
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    Quote Originally Posted by Amon_RA View Post
    What happens when you leave the 8701 in its socket and install the LumaTOLB under the VICII?
    The short answer: Your C64 consumes a bit more power for nothing.

    LumaTOLB is designed to offer a solution for older boards which do not use the 7701/8701 and have problems with their clock generator which is designed around a cluster of discreet logic ICs. Since there probably is a signal coming out of these chips, good or bad, and they can't be removed easily like the 7701/8701, they must be disconnected from the VIC-II to avoid some sort of tug of war between them and the TOLB components.

    For this reason, LumaTOLB is missing pins 21 and 22 (see the two X near C4 on the 3D image of the bottom layer). This is where the clock signal generated either by a 7701/8701 or the cluster of logic chips older boards carry comes into the VIC-II. Since LumaTOLB feeds the clock signals directly to the VIC-II it carries, these pins are no longer needed. Cutting them prevents conflicting signals.

    If you use LumaTOLB on a board which has a socket for the 7701/8701, you can just remove it and sell it. It's outputs won't be connected to anything anymore.
    Last edited by eslapion; 10th January 2018 at 22:27.

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    Starglider's Avatar
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    Interesting! Couple of Qs:

    1. Will this allow a 250407 NTSC to convert to PAL just by adding the PAL LumaTOLB?

    2. If not does it minimize the process; eg requires only a PAL VIC but doesn't require moving the PCB jumper or changing the crystal?

    3. Will a 250407 fit in a C64C case with a heat sink on top of the Vic?
    Last edited by Starglider; 11th January 2018 at 06:32.
    Thanks!
    "Recordar es vivir"


    Amiga 500 Rev 5 NTSC | Kickstart 3.1 | A508IDE 4GB CF HDD | Supra Clock 500 | Chinon FZ-357A HD FDD

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    Quote Originally Posted by Starglider View Post
    Interesting! Couple of Qs:

    1. Will this allow a 250407 NTSC to convert to PAL just by adding the PAL LumaTOLB?

    2. If not does it minimize the process; eg requires only a PAL VIC but doesn't require moving the PCB jumper or changing the crystal?

    3. Will a 250407 fit in a C64C case with a heat sink on top of the Vic?
    1. Yes! Just like TOLB can convert a C64 board from NTSC to PAL and inversely, the same is true with LumaTOLB

    2. Well, that was yes to Q.1 so...

    3. This depends entirely on the type of heat sink. I can also modify a LumaTOLB to provide 5V on both pins 40 and 13 so you can use a 8562/8565 instead of a 6567/6569 on your board. The 856X produces much less heat and usually doesn't require a heat sink at all.

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