Comments on: Zorro II Cards On The Amiga 500 https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500 Trains, computers, vintage, retro, model railways... the lot... Sat, 06 Mar 2021 10:45:12 +0000 hourly 1 https://wordpress.org/?v=6.4.3 By: stevenh https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500/comment-page-1#comment-47892 Sat, 06 Mar 2021 10:45:12 +0000 https://modelrail.otenko.com/?p=9809#comment-47892 In reply to Another Keith.

Hi Keith,
The capacitors are labelled and installed the correct way around.
The 7905 is a negative voltage regulator. Therefore, the output is negative and the filter caps need negative to the input/output of the 7905 and positive to ground.
Steven.

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By: Another Keith https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500/comment-page-1#comment-47884 Fri, 05 Mar 2021 21:03:22 +0000 https://modelrail.otenko.com/?p=9809#comment-47884 Amazing post really interesting & very helpful, also wanted to thank you for help on the relay part number!

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By: Another Keith https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500/comment-page-1#comment-47882 Fri, 05 Mar 2021 18:35:20 +0000 https://modelrail.otenko.com/?p=9809#comment-47882 In reply to Another Keith.

Hello Steven

Sorry to bother you but I am also building one, the only odd thing that I don’t understand is why on the silk screen on caps C6 & C3 the positive marking is really ground or am I missing something as it negative rail?, sorry for the question, as all pictures I see show these caps installed backwards.

Many thanks

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By: stevenh https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500/comment-page-1#comment-47692 Sun, 07 Feb 2021 10:04:37 +0000 https://modelrail.otenko.com/?p=9809#comment-47692 In reply to Keith.

Hi Keith,

It’s definitely a -5v regulator. The standard side-car slot peripherals don’t use/need the -5v, but Zorro II cards do, and since it’s not available, needs to be created for them.

I can’t confirm if a video card will work in this slot. I’ve only tested RAM/Storage.

Steven.

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By: Keith https://modelrail.otenko.com/c64amiga/zorro-ii-cards-on-the-amiga-500/comment-page-1#comment-47688 Sat, 06 Feb 2021 18:16:59 +0000 https://modelrail.otenko.com/?p=9809#comment-47688 Awesome post :o) Do you have a part number for the regulator? The BOM mentions a “7905TV” (Negative voltage regulator). I’m looking into a Zorro graphic card, any thoughts?

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