Normal Chassis:
- C4, C5, C6 in lower position
- jumpers installed immediatly above R7, R8, R9
- holes above jumpers left open
- Q4 present

Inverted Chassis:
- C4, C5, C6 in upper position
- 680ohm resistors installed immediatly above R7, R8, R9
- holes above 680ohm resistors jumped
- Q4 missing

NOTE:
Only remove Q4 if you experience sync issues. Adding Q4 when
converting from inverted to normal is recommended, but may not
be necessary.

Q4 (2N3904) appears to be related to the sync/blanking circuit
when an additional daughter-card is installed at P7, although
it does connect to pin-12 of both IC1 and IC2 regardless of a
daughter-card being installed (see schematic).