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Re: Icky's H4 Mongrel edition build x 2
Posted: 22 Nov 2019 20:59
by Icky
derkom wrote: 22 Nov 2019 20:51
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
Re: Icky's H4 Mongrel edition build x 2
Posted: 22 Nov 2019 21:03
by Icky
@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 :)
IMG_4547.jpeg
Re: Icky's H4 Mongrel edition build x 2
Posted: 22 Nov 2019 21:26
by stephen_usher
Icky wrote: 22 Nov 2019 18:52
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.
Re: Icky's H4 Mongrel edition build x 2
Posted: 22 Nov 2019 21:35
by derkom
Aha, I guess I've just never run into a short foot case. I thought all ST floppy feet were the same size.
Re: Icky's H4 Mongrel edition build x 2
Posted: 22 Nov 2019 21:42
by exxos
derkom wrote: 22 Nov 2019 21:35
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.
Re: Icky's H4 Mongrel edition build x 2
Posted: 23 Nov 2019 19:28
by Icky
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.
IMG_4555.jpeg
Re: Icky's H4 Mongrel edition build x 2
Posted: 24 Nov 2019 12:20
by kodak80
@Icky Would it be tidier to use an 33R 0805 SMD resistor underneath the board?
Re: Icky's H4 Mongrel edition build x 2
Posted: 24 Nov 2019 12:31
by PhilC
kodak80 wrote: 24 Nov 2019 12:20
@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.
Re: Icky's H4 Mongrel edition build x 2
Posted: 24 Nov 2019 13:42
by Icky
@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 :)
Re: Icky's H4 Mongrel edition build x 2
Posted: 24 Nov 2019 15:33
by PaulJ
kodak80 wrote: 24 Nov 2019 12:20
@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. :(