Troed's H4 build

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troed
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Re: Troed's H4 build

Post by troed » Mon Jun 22, 2020 8:55 pm

It's so pretty! <3 <3 <3 <3

Also, dead as a Brexit deal.

Oh well, it would be no fun if it was too simple ;) I might've skipped something I shouldn't.

built up.JPG
built up.JPG (432.7 KiB) Viewed 1190 times

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exxos
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Re: Troed's H4 build

Post by exxos » Mon Jun 22, 2020 9:05 pm

Done all the patches & fixes ?
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Re: Troed's H4 build

Post by troed » Mon Jun 22, 2020 9:24 pm

exxos wrote:
Mon Jun 22, 2020 9:05 pm
Done all the patches & fixes ?
I think so, at least those relevant to see it boot (e.g. - I've cut the trace to the serial port but not soldered the patch wire).

The photo above still lacked the final resistors by the expansion sockets - those are also done.

I'm dead tired after having slept very little a few nights so I'll stop for tonight and look over things tomorrow. Should be something simple. Although there is one possibility: I came into the workshop one morning and found the PCB on the floor. The kittens had jumped up and managed to push it over the edge of the workbench ... flat down onto stone tiling.

/Troed

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PhilC
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Re: Troed's H4 build

Post by PhilC » Mon Jun 22, 2020 9:37 pm

@troed looks likeca good job.

From the photo the only bit I can see wrong is that you have a blitter but also have the jumpers made. Blotter = no jumpers.
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Re: Troed's H4 build

Post by Icky » Mon Jun 22, 2020 10:22 pm

:thumbup: - Nice.

I think my first H4 not booting was down to a solder bridge on U2 that I could hardly see.

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Re: Troed's H4 build

Post by Robson » Mon Jun 22, 2020 10:31 pm

I think you should have the jumper between the Blitter socket and the cpu OPENED as well if you have the blitter installed.

edit: Ah just read PhilC's comment...but yeah open both jumpers around the Blitter.

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Re: Troed's H4 build

Post by troed » Mon Jun 22, 2020 10:59 pm

Ah, thanks. Both jumpers now open but same same. Tomorrow will be microscope and LA day.

/Troed

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Re: Troed's H4 build

Post by rubber_jonnie » Tue Jun 23, 2020 10:14 am

So what exactly happens on boot? Black screen? White screen? White border with black centre?

Do you have exxos IDE adapter at all? I had a problem with U2 and got a white screen, so I popped in the IDE adapter as it has it's own CPU and ROM all together, and mine booted ok, so I knew the problem was the LS11.

Might be worth getting at least one expansion socket installed for things like the IDE board and I'd definitely suggest getting the cartridge port and serial port up and running so you can potentially use a diag cart.
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Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
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Re: Troed's H4 build

Post by troed » Tue Jun 23, 2020 10:33 am

rubber_jonnie wrote:
Tue Jun 23, 2020 10:14 am
So what exactly happens on boot? Black screen? White screen? White border with black centre?
Well, the only video circuitry I have is the HDMI board. It lights up (red led) and I _think_ it's just then sending empty frames to the monitor. What this would mean in ST analog output I don't know.

I've tried replacing it with a regular Shifter and then connecting up a floppy to see if that boots (audibly), but it doesn't.

I'm not too worried. When I have time I'll just look through the boot process with the LA connected up. I've done a visual inspection and measured the SMT components for bridges but that seems fine.

regards,
Troed

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Re: Troed's H4 build

Post by rubber_jonnie » Tue Jun 23, 2020 10:51 am

troed wrote:
Tue Jun 23, 2020 10:33 am
rubber_jonnie wrote:
Tue Jun 23, 2020 10:14 am
So what exactly happens on boot? Black screen? White screen? White border with black centre?
Well, the only video circuitry I have is the HDMI board. It lights up (red led) and I _think_ it's just then sending empty frames to the monitor. What this would mean in ST analog output I don't know.

I've tried replacing it with a regular Shifter and then connecting up a floppy to see if that boots (audibly), but it doesn't.

I'm not too worried. When I have time I'll just look through the boot process with the LA connected up. I've done a visual inspection and measured the SMT components for bridges but that seems fine.

regards,
Troed
I must admit, I was very envious of the Shifter board, I want one for my second H4, but the lack of visual output for diagnostics does worry me a bit, because the lo-res output is pretty helpful from a diagnostics point of view.

I'm confident you'll get to the bottom of it :)
Collector of old Atari things:
800XL + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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