Re: MK14 schematic revisions
It looks great for something completely scratch designed!
I suggest that chopping / reversing the 7445 outputs before they diverge towards the display and keypad may fix BOTH of your problems at the same time.
Just for fun, a short program for you to enter and run when you get it working.
With the MK14, it's always a good idea to check through entered code at least once more before running, as just one wrong byte can send the CPU out of control and trash the rest of your carefully entered code in the process.
After entering all the bytes from 0F20-0F42 as below, hit Abort, O F 2 0, GO.
0F20-C4
0F21-0D
0F22-35
0F23-C4
0F24-00
0F25-31
0F26-C4
0F27-0F
0F28-36
0F29-C4
0F2A-3B
0F2B-32
0F2C-C4
0F2D-07
0F2E-01
0F2F-C2
0F30-80
0F31-C9
0F32-80
0F33-C4
0F34-FF
0F35-02
0F36-70
0F37-94
0F38-F5
0F39-90
0F3A-F1
0F3B-00
0F3C 79
0F3D 06
0F3E 74
0F3F-78
0F40-3F
0F41-38
0F42-6D
|