2–9
Principles of Operation
Control Panel
Printer Setup
Printer Enable
Input Data Buffer
(Dynamic RAM)
ASCII data (DPU) **
** Controlled by software,
executed by hardware.
Printer Interface:
Host Input Data
Build dot image from lookup
tables. Put into Dynamic RAM
(DPU).
Synchronize timing to
codewheel (MPU) software.
Demand hammer load data
be shifted to hammer
driver. **
Fire hammers on next MPU.
(Software timers.)
All dots in
row printed?
Move paper.
(Mech. Driver)
YesNo
Software
decision
EBCDIC to ASCII
conversion.
(CT/CTHI models)
Figure 2–8. The Print Cycle
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