Icky's H4 Mongrel edition build x 2

Topic for users to share their building progress.
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Icky
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Re: Icky's H4 Mongrel edition build x 2

Post by Icky » Fri Nov 22, 2019 8:59 pm

derkom wrote:
Fri Nov 22, 2019 8:51 pm
Would that even be a problem? The floppy drive leg, minus the bottom foot portion, is around 18.4 mm, and the crystal, at least the one on the BOM, is only 13.46 mm tall. It'll be close, but it seems like it should fit okay.
It depends on the drive and the case. Some cases and drive combinations have feet that are 10mm

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Re: Icky's H4 Mongrel edition build x 2

Post by Icky » Fri Nov 22, 2019 9:03 pm

@derkom here is an example of case / board (very dusty) with small feet and flat XTAL. This is the problem with the revisions, no consistency :)

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Re: Icky's H4 Mongrel edition build x 2

Post by stephen_usher » Fri Nov 22, 2019 9:26 pm

Icky wrote:
Fri Nov 22, 2019 6:52 pm
Also as mentioned by @exxos be careful when soldering in the battery it goes in nicely but dont get solder across the other track that is missing the solder mask.
Paint some clear nail polish over it? That should be able to withstand the transcient heat.
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Re: Icky's H4 Mongrel edition build x 2

Post by derkom » Fri Nov 22, 2019 9:35 pm

Aha, I guess I've just never run into a short foot case. I thought all ST floppy feet were the same size.

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Re: Icky's H4 Mongrel edition build x 2

Post by exxos » Fri Nov 22, 2019 9:42 pm

derkom wrote:
Fri Nov 22, 2019 9:35 pm
Aha, I guess I've just never run into a short foot case. I thought all ST floppy feet were the same size.
The older STF drives (more long button era) , were taller than the newer drives we know today. Even the belt driven ones were even larger. So I think there is actually 3 different heights.
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Re: Icky's H4 Mongrel edition build x 2

Post by Icky » Sat Nov 23, 2019 7:28 pm

Found another patch.

I had soldered in the BAD DMA (if it was anywhere it was going to be around the BAD DMA) then I noticed a resistor was missing underneath it. The socket bar was right over the top.

Careful snipping of the plastic bar and I was able to lay the R903 (33R) flat. I say careful as you dont want to scrape any tracks under the bar.

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Re: Icky's H4 Mongrel edition build x 2

Post by kodak80 » Sun Nov 24, 2019 12:20 pm

@Icky Would it be tidier to use an 33R 0805 SMD resistor underneath the board?
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Re: Icky's H4 Mongrel edition build x 2

Post by PhilC » Sun Nov 24, 2019 12:31 pm

kodak80 wrote:
Sun Nov 24, 2019 12:20 pm
@Icky Would it be tidier to use an 33R 0805 SMD resistor underneath the board?
That might be a good idea or even fitting the resistor underneath anyway.
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Re: Icky's H4 Mongrel edition build x 2

Post by Icky » Sun Nov 24, 2019 1:42 pm

@kodak80 @PhilC either options are good :)

I did think of putting it underneath but I just went for the hack-tactic approach as I had the resistor sat right in front of me at the time. I think the next board will be an 0805 :)

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Re: Icky's H4 Mongrel edition build x 2

Post by PaulJ » Sun Nov 24, 2019 3:33 pm

kodak80 wrote:
Sun Nov 24, 2019 12:20 pm
@Icky Would it be tidier to use an 33R 0805 SMD resistor underneath the board?
Excellent idea Kodak. :D As I recall you used this method on the H1. I will be using it on my boards if they ever show up. :(

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