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Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 8:42 pm
by Icky
exxos wrote: ↑Tue Sep 25, 2018 2:21 pm
RAM RW FIX
Fixes wrong RW line connected to RAM.
Fix in place
- IMG_3104.png (841.91 KiB) Viewed 6554 times
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 9:08 pm
by exxos
1772 IRQ TYPO FIX
Pin 28 of the 1772 had a typo and wasn't connected to the MFP...
Bodge wire as shown below...
- 1772.jpg (164.42 KiB) Viewed 6544 times
Actually this explains some confusion of the missing pull up on the MFP as it should be going to pin 2 of that pack, that lines doesn't actually have a pull up on the ST diagram.
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:33 pm
by exxos
KEYBOARD RESISTOR FIX
Fixes missing pull down (first pull down missing! so yay!
)
Solder a 10K resistor between the 2 highlighted pins..
- aciaf1.jpg (34.76 KiB) Viewed 6520 times
Then have a shot of whiskey...
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:39 pm
by Icky
exxos wrote: ↑Tue Sep 25, 2018 10:33 pm
KEYBOARD RESISTOR FIX
Does that mean U52 has the same problem - judging by the schematic and your history with pull-ups
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:40 pm
by exxos
Icky wrote: ↑Tue Sep 25, 2018 10:39 pm
Does that mean U52 has the same problem - judging by the schematic and your history with pull-ups
Oddly I added that one
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:42 pm
by Icky
exxos wrote: ↑Tue Sep 25, 2018 10:40 pm
Icky wrote: ↑Tue Sep 25, 2018 10:39 pm
Does that mean U52 has the same problem - judging by the schematic and your history with pull-ups
Oddly I added that one
I think you just like to keep me busy with my soldering iron
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:47 pm
by exxos
Icky wrote: ↑Tue Sep 25, 2018 10:42 pm
I think you just like to keep me busy with my soldering iron
At least your keeping up, Not sure where the other 15 people have gotten to...
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:53 pm
by Icky
exxos wrote: ↑Tue Sep 25, 2018 10:47 pm
Icky wrote: ↑Tue Sep 25, 2018 10:42 pm
I think you just like to keep me busy with my soldering iron
At least your keeping up, Not sure where the other 15 people have gotten to...
I think they are watching the fun Forgottenmyname, you and I are having before they embark on this adventure
Unfortunately that fix made no change - keyboard still not working or reporting in the diagnostic cart
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:54 pm
by exxos
Icky wrote: ↑Tue Sep 25, 2018 10:53 pm
Unfortunately that fix made no change - keyboard still not working or reporting in the diagnostic cart
ah crap.. will have a final snoop then calling it a day.. out all day tomorrow so have to pickup Thursday...
Re: ALPHA MODIFICATIONS
Posted: Tue Sep 25, 2018 10:55 pm
by Icky
exxos wrote: ↑Tue Sep 25, 2018 10:54 pm
Icky wrote: ↑Tue Sep 25, 2018 10:53 pm
Unfortunately that fix made no change - keyboard still not working or reporting in the diagnostic cart
ah crap.. will have a final snoop then calling it a day.. out all day tomorrow so have to pickup Thursday...
No - not crap. Its fixed the sound. We have sound.