ALPHA MODIFICATIONS

All information relating to the Alpha plus all the WIP threads etc.
troed
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Re: ALPHA MODIFICATIONS

Post by troed »

exxos wrote: Tue Sep 18, 2018 6:32 pm
troed wrote: Tue Sep 18, 2018 6:29 pm I'm confused by this being connected to BR.
Its a missing pull up resistor on BR & BGACK.
Yes. But both the pullup fixes are connected to BR, none of them to BGACK :)
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PhilC
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Re: ALPHA MODIFICATIONS

Post by PhilC »

Just put the /BGACK resistor in and now /BGACK, /BG & /BR all stay high, do i need to put that link to thepullups?
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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos »

troed wrote: Tue Sep 18, 2018 6:35 pm Yes. But both the pullup fixes are connected to BR, none of them to BGACK :)
oops... Updated the image...
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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos »

Forgottenmyname wrote: Tue Sep 18, 2018 6:38 pm Just put the /BGACK resistor in and now /BGACK, /BG & /BR all stay high, do i need to put that link to thepullups?
Check back as I updated a image just...

https://www.exxosforum.co.uk/forum/viewt ... =10#p10084
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos »

:headbang: :headbang: :headbang: :headbang:

Looks like I've missed a resistor pack off, as some more pins haven't go pull ups either.. will post fixes shortly....
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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos »

5 RESISTOR FIX

<shame mode>

Fix for missing pull up resistors on, LDS,UDS,RW,AS,BGACK

5 highlighted pins, wire each to a 2.2K resistor, and wire the other ends to 5V (top end of C21 is 5V)

fu1.jpg
fu1.jpg (85.63 KiB) Viewed 5040 times

</shame mode>
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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PhilC
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Re: ALPHA MODIFICATIONS

Post by PhilC »

Yes, I laughed, after I swore a few times :D

Here's the fix as a photo
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20180918_185225.jpg
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Icky
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Re: ALPHA MODIFICATIONS

Post by Icky »

Photo of using an extra SIL to provide the 5 extra pull-ups and using the SIL to also provide the BGACK PULL UP FIX

The other wire is the BR PULL UP FIX

White insulating tape to stop any shorts whilst the board is laid flat

IMG_3063.png
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Re: ALPHA MODIFICATIONS

Post by Atarian Computing »

Icky wrote: Wed Sep 19, 2018 10:55 pm Photo of using an extra SIL to provide the 5 extra pull-ups and using the SIL to also provide the BGACK PULL UP FIX
Ooh, very nice! :bravo:
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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos »

VIDEO SOCKET FIX

DO NOT SOLDER THE VIDEO SOCKET.

The pinout is wrong and we are working on solutions...

See the PCB fix option in topic below...

https://www.exxosforum.co.uk/forum/viewt ... =19&t=1211
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
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