ALPHA MODIFICATIONS

[troed]

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

[PhilC]

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

[exxos]

Yes. But both the pullup fixes are connected to BR, none of them to BGACK

oops... Updated the image...

[exxos]

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

[exxos]

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

[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 (85.63 KiB) Viewed 6194 times

</shame mode>

[PhilC]

Yes, I laughed, after I swore a few times

Here's the fix as a photo

[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 (1.13 MiB) Viewed 6117 times

[Atarian Computing]

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!

[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