Det-Tronics S3 Graphics - Manual (Page 284)

EQP LOGIC EDITOR 13-59 EQP LOGIC EDITOR
Version 6.0 SIL 2 LOGIC SIL 2 LOGIC
Not SIL 2 compliant. There are non-red colored inputs and outputs.
SIL 2 compliant, everything is red except comments.
Not SIL 2 compliant, mixed usage of black logic gates with red logic gates.