H4G - Mongrel SMT Edition

Related information and WIP etc
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Icky
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H4G - Mongrel SMT Edition

Post by Icky » Wed May 20, 2020 6:31 pm

:logo: - H4G Mongrel SMT Edition

Starting a thread where @exxos and I will update on all the fixes and changes as we work on the next board H4G.

We will start with all the fixes from the patch info viewtopic.php?f=78&t=2335. Below is the list of all the patches and the fixes for them to start this thread off.

Holes - a few tweaks where required to holes on the board. The following pictures show the improvements and fixes.

Screenshot 2020-05-20 at 13.37.23.png
Screenshot 2020-05-20 at 13.37.23.png (233.87 KiB) Viewed 1306 times
Screenshot 2020-05-20 at 13.48.08.png
Screenshot 2020-05-20 at 13.48.08.png (219.33 KiB) Viewed 1306 times
Screenshot 2020-05-20 at 13.36.58.png
Screenshot 2020-05-20 at 13.36.58.png (233.47 KiB) Viewed 1306 times

Battery - a route close to the pad was exposed with the potential to short. The route has been moved out of the way.

Before:
IMG_4715.JPG
IMG_4715.JPG (405.41 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 14.42.56.png
Screenshot 2020-05-20 at 14.42.56.png (110.2 KiB) Viewed 1306 times

MFP OSC - The MFP OSC was orientated vertically which obstructs mounting a floppy drive. The OSC has been laid flat.

Before:
IMG_4545.jpeg
IMG_4545.jpeg (503.01 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 16.25.15.png
Screenshot 2020-05-20 at 16.25.15.png (423.95 KiB) Viewed 1306 times

Missing DTACK Route - There was a missing DTACK route between the CPU and Blitter.This has been added.

Before:
Capture.PNG
Capture.PNG (205.74 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 16.31.46.png
Screenshot 2020-05-20 at 16.31.46.png (469.7 KiB) Viewed 1306 times

DMA Resistor - One of the DMA resistors was underneath the DIL socket location. This has been moved out side of the socket area.

Before:
dmares.jpeg
dmares.jpeg (210.61 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 16.41.12.png
Screenshot 2020-05-20 at 16.41.12.png (482.54 KiB) Viewed 1306 times

BGACK Pull Up - BGACK was missing a pull up. There is a spare pin on RP8 we can use.

Before:
oopsies.JPG
oopsies.JPG (149.29 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 16.56.45.png
Screenshot 2020-05-20 at 16.56.45.png (100.69 KiB) Viewed 1306 times

4MB RAM SIMM - Route was to the wrong pin so needed moving to enable the 4MB to be seen.

Before:
1.JPG
1.JPG (114.59 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 18.21.45.png
Screenshot 2020-05-20 at 18.21.45.png (136.66 KiB) Viewed 1306 times

RS232 Fix - Route to Pin 20 needed to go to Pin 7 instead.

Before:
px.JPG
px.JPG (206.46 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 17.24.29.png
Screenshot 2020-05-20 at 17.24.29.png (524.25 KiB) Viewed 1306 times

DAC Fix - ADC0 lines were tied to GND they need to be balanced between 5v and GND.


Before:
dacf1.JPG
dacf1.JPG (358.07 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 17.34.36.png
Screenshot 2020-05-20 at 17.34.36.png (646.5 KiB) Viewed 1306 times

DMA Issue - To get the DMA to work required a patch board. This board circuit has been included in to the H4G schematic.


Before (patch board):
IMG_5281.jpeg
IMG_5281.jpeg (173.31 KiB) Viewed 1306 times
Fixed:
Screenshot 2020-05-20 at 17.51.22.png
Screenshot 2020-05-20 at 17.51.22.png (527.22 KiB) Viewed 1306 times

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PaulJ
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Re: H4G - Mongrel SMT Edition

Post by PaulJ » Wed May 20, 2020 6:38 pm

Sign me up for 2 or 3.. like the SMT construction much better, looks great. :excited: :excited: :excited:

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derkom
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Re: H4G - Mongrel SMT Edition

Post by derkom » Wed May 20, 2020 6:46 pm

I'd build another one. :D

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Re: H4G - Mongrel SMT Edition

Post by DoG » Wed May 20, 2020 7:35 pm

Not SMT on the 74LS245? Or is this a WIP? All 74LSxxx chips will be SMT I hope.

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Re: H4G - Mongrel SMT Edition

Post by exxos » Wed May 20, 2020 7:36 pm

DoG wrote:
Wed May 20, 2020 7:35 pm
Not SMT on the 74LS245? Or is this a WIP?
Icky hasn't posted everything yet :)
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: H4G - Mongrel SMT Edition

Post by Icky » Wed May 20, 2020 7:36 pm

DoG wrote:
Wed May 20, 2020 7:35 pm
Not SMT on the 74LS245? Or is this a WIP?

WIP @DoG. You dont want to see the spaghetti its in at the moment. Will be updating pics of all the sections as they turn to SMT.

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Re: H4G - Mongrel SMT Edition

Post by DoG » Wed May 20, 2020 7:38 pm

I thought so. DoG is happy :D

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Re: H4G - Mongrel SMT Edition

Post by Tomswork » Wed May 20, 2020 7:58 pm

Sign me up for 2 boards as well.

Tom

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Re: H4G - Mongrel SMT Edition

Post by exxos » Wed May 20, 2020 8:28 pm

I will start a new thread soon for interested parties in the new board..
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: H4G - Mongrel SMT Edition

Post by PhilC » Wed May 20, 2020 8:30 pm

exxos wrote:
Wed May 20, 2020 8:28 pm
I will start a new thread soon for interested parties in the new board..
Sign me up cos its gonna need breaking
If it ain't broke, test it to Destruction.

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