Here is a email that I sent to the previous owner on May 20, 2003.

There were many problems with your CT-1024. Here is a summary of what I did.

I never powered up the unit as you sent it. I built a second case and
mounted the power supply and made new cables for the power and video out.
This is identical to my other restored CT-1024.

I then put the main board on it and powered it up.  There was no scan or
video, IC20 gate D (7405 inverter OC) was dead killing the dot clock. I put
a second 7405 on top of IC20 and replaced the gate, I soldered just 4 leads
with the rest in the air. This restored the scan but there was still no
video.

The character generator, IC22, had a good output but the shifter register
chain (IC24 and IC23) was not  working. IC 24 seemed OK but pin 10 of IC23
as stuck. I clipped the pins on the 7495 (IC23) and unsoldered the remaining
leads. I put a socket in and a new 7495 IC. I then had a screen full of
random characters.

I then hooked up the keyboard. Nothing. I tried the keyboard on another
CT-1024 and found the keypress jumper was set to + instead of -. I swapped
that.

I noticed there was no blinking cursor. I redrew the cursor portion of the
schematic to understand how it worked. I used a test lead to ground the
cursor inputs and found the cursor would come and go.

I installed the cursor control board and found the cursor did not work on
even addresses.  The A0 compare circuit uses an XOR gate made of IC40C,
IC40D, IC33E, and IC33F. I found the pin 5 of IC40 was floating and not
connected to A0. This 7403 was in a socket. The trace to pin 5 was cut so I
replaced it.

The keyboard would now enter characters but the cursor did not advance to
the next position. IC20 is also in this path so I replaced the 7405 and then
the cusor advanced with each character.

The keyboard doesn't produce all of the letters so I still need to fix that.

To get this far I had to replace two ICs (IC20 and IC23) and fix one cut
trace.

Michael Holley