Epson LQ-800 - Parallel Interface Timing

3. All interface conditions are based on TTL level. Both the rise and
the fall times of each signal must be less than 0.2 microseconds.
4. Data transfer must be carried out by observing the ACKNLG or
BUSY signal. (Data transfer to this printer can be carried out only
after receipt of the ACKNLG signal or when the level of the BUSY
signal is LOW.)
Interface timing
Figure F-1 shows the timing for the parallel interface.
Figure F-1. Parallel interface timing
F-3