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External Signal
DCW2
DCW3
DCW4
DCWS
Encoded from
DCWOI-DCW04 (Delayed Strobe Outputs)
Internal Signals
DCWI
+
DCW3
+
DCWS
DCW4
+
DCWS
DCW4
DCWS
Generated on LSI chip ME16 pins 7 (DCWOl), 8 (DCW02), 9 (DCW03), and
10
(=DC=W-0~4).
The delayed strobe counter like the strobe counter is reset by
DCWO.
During normal printing of 9 x 7 characters, each DLYSTB pulse in-
crements the counter. During elongated character printing, alternate STROBE
pulses increment the counter making each DCWO interval twice its normal width.
As in the strobe counter timing, if option SPCG is used, then the
external DCWOI-DCW04 signals are related to the internal DCWOl to DCW05 intervals
as follows:
External Signal
DCWOl
DCW02
DCW03
DCW04
ROME2 (ROM Timing)
Encoded from
Internal Signal
DCWOl
+
DCW03
+
DCW05
DCW02 + DCW03
DCW04
+
DCW05
STROBE
+
DCW)
Generated on LSI chip ME16 pin 24. This signal is the timing input
to the "half-step" character generator ROM (Read-Only Memory).
During normal printing of 9 x 7 characters, each DLYSTB, (Delayed Strobe)
pulse generates a ROME2 pulse. When printing elongated 9 x 7 characters, each
video STROBE pulse generates a ROME2 pulse.
OSC (Oscillator Output)
Generated on LSI chip ME16, pin 25. The frequency of this system clock is
100 KHz (min.) to 200 KHz (max.). Signal OSC is inverted by ME20-6 to generate
OSCXT to the interface connector. Signal OSC is also used by both LSI chips to
generate clocks 01 to 02 used internally by the LSI chips.
4-42
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