exxos's Atari, Amiga & retro forum

exxos wrote: 25 Sep 2018 14:21 RAM RW FIX

Fixes wrong RW line connected to RAM.

Fix in place

1772 IRQ TYPO FIX

Pin 28 of the 1772 had a typo and wasn't connected to the MFP...

Bodge wire as shown below...



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.

KEYBOARD RESISTOR FIX

Fixes missing pull down (first pull down missing! so yay! :lol: )


Solder a 10K resistor between the 2 highlighted pins..


Then have a shot of whiskey...

exxos wrote: 25 Sep 2018 22:33 KEYBOARD RESISTOR FIX

Does that mean U52 has the same problem - judging by the schematic and your history with pull-ups :)

Icky wrote: 25 Sep 2018 22:39 Does that mean U52 has the same problem - judging by the schematic and your history with pull-ups :)

Oddly I added that one :)

exxos wrote: 25 Sep 2018 22:40

Icky wrote: 25 Sep 2018 22:39 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

Icky wrote: 25 Sep 2018 22:42 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...

exxos wrote: 25 Sep 2018 22:47

Icky wrote: 25 Sep 2018 22:42 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

Icky wrote: 25 Sep 2018 22:53 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...

exxos wrote: 25 Sep 2018 22:54

Icky wrote: 25 Sep 2018 22:53 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.