Toshiba B-SX4 Series Key Operations Manual page 135

When the power is turned on while pressing the [FEED], [RESTART], and [PAUSE] keys at the same
time, the printer enters the download mode.
In the download mode, only commands concerning downloading are available.
The printer keys can be used for selecting between "DOWNLOAD MODE" and "DOWNLOAD MODE 2".
The timing for ACK-BUSY in Centronics differs between "DOWNLOAD MODE" and "DOWNLOAD
MODE 2". When downloading is not performed properly in the "DOWNLOAD MODE", it may be
performed properly if "DOWNLOAD MODE 2" is selected.
One of two types of the BUSY/ACK timing can be selected.
(1) DOWNLOAD MODE (Default)
Data 1 to 8
(Host → Printer)
nStrobe
(Host → Printer)
Busy
(Host ← Printer)
nAck
(Host ← Printer)
(2) DOWNLOAD MODE 2
Data 1 to 8
(Host → Printer)
nStrobe
(Host → Printer)
Busy
(Host ← Printer)
nAck
(Host ← Printer)
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