Have you checked the voltages on the board? played with the pot that adjusts voltages? Cleaned the actual male pins and female sockets of all the connectors to the digital board?
Have you tried a known working drive in the IIfx? Do you get same problem? Oh I should read above posts you have done this so its a board issue. Another SWIM to be sure
Voltage is too low, should be around 5v, check your two boards in the working 128k. Have a look at the circuit of analogue board and look for faulty components or joints around the voltage adjustment potentiometer.
If you look at the different backgounds in the control panel there is one that is all squares if you set it you can easily adjust the screen until all the squares look correct and the screen size is as mentioned above
Looking at your board I think it suits a reloaded. You have the possibility of spending a lot of time testing and track repairing compared to a parts swap. Mind you you may be lucky and its easy to fix but!
I'd source another keyboard rather than trying to fix yours. Not hard to find on fleabay. I'd then concentrate on making sure everything is working correctly by using System 7.01. When you have proved your SE is OK then have a play with higher systems. System 6.0.8 was written in assembly...
Going very well. Maybe try reseating the ROM and RAM chips on the board. Can you type when booted into 6.08 or 7. Create and new folder and try to rename it. Forgot its an SE not SE/30 you only have 4mb of memory to play with, look at memory being used in Basilisk!
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