Citizen CBM1000 manual Timing Chart Compatibility Mode, Data Reception Control, Buffering

6.2.3 Timing Chart (Compatibility Mode)

Data input and print timing

Power

Data

nStrobe

T6

Busy

nAck

T5

T2

T1 T3

T4

T1, T2, T3:	0.5	µs MIN
T4:	270 ns MAX
T5:	2.3	µs TYP
T6:	500 ms MIN (At power- on)

6.2.4 Data Reception Control

When the Busy signal is at “LOW”, the printer can receive data from the host computer, but when at “HIGH”, data reception is not possible.

6.2.5 Buffering

Since the printer can buffer 4K bytes of data, the host computer is immediately made free.

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