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 » Tue Sep 18, 2018 6:35 pm

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 » 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?
If it ain't broke, test it to Destruction.

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exxos
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Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 18, 2018 6:41 pm

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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Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 18, 2018 6:42 pm

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...

viewtopic.php?f=19&t=1185&start=10#p10084
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 18, 2018 6:48 pm

: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....
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 18, 2018 6:53 pm

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 1049 times

</shame mode>
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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PhilC
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Re: ALPHA MODIFICATIONS

Post by PhilC » Tue Sep 18, 2018 6:53 pm

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

Here's the fix as a photo
Attachments
20180918_185225.jpg
20180918_185225.jpg (3.86 MiB) Viewed 1048 times
If it ain't broke, test it to Destruction.

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Icky
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Re: ALPHA MODIFICATIONS

Post by Icky » 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

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
IMG_3063.png (1.13 MiB) Viewed 972 times

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Re: ALPHA MODIFICATIONS

Post by Atarian Computing » Thu Sep 20, 2018 4:38 am

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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Re: ALPHA MODIFICATIONS

Post by exxos » Fri Sep 21, 2018 12:11 am

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...

viewtopic.php?f=19&t=1211
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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