PhilipA
Experienced Member
Holding the data high on the video dram does nothing other than stop the computer from beeping.
Didn't determine which is the brightness line to the monitor.
Ram on the CPU board has data in and data out with random data that I can capture.
Doesn't appear to be much going on at the keyboard connector but the largest chip on the board is operating because I can get a digital output that changes i/o state with different key presses.
Checked all the voltages actually on the boards after cleaning the power plug.
+4.96
+11.94
-5.01
-12.03
All well within limits and stable.
Phil
Didn't determine which is the brightness line to the monitor.
Ram on the CPU board has data in and data out with random data that I can capture.
Doesn't appear to be much going on at the keyboard connector but the largest chip on the board is operating because I can get a digital output that changes i/o state with different key presses.
Checked all the voltages actually on the boards after cleaning the power plug.
+4.96
+11.94
-5.01
-12.03
All well within limits and stable.
Phil