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PMSOL remains low until one of the following conditions occurs:
(1) A paper time-out condition is detected,
(2) A power prime (PWRPRM) condition exists,
(3) If the optional Vertical Format Unit (VFU) is used, a hole in
channel 7 of the paper tape is reached (FFH) during a form feed
operation, or
(4) If the optional VFU is used, a hole in channelS of the paper
tape is reached (VTH) during a vertical tab operation.
DSCR
(Decoded Carriage Return)
Generated on LSI chip ME25 pin 12. DSCR goes active low when a con-
trol character (zeroes in bits
6
and 7) is loaded into the shift register.
In normal operation, the only control code loaded into memory is a CR code
(octal 015). However, with the DSC option (jumper E10 to Ell), in addition
to the CR code, any of the following control codes may be loaded into memory:
LF (octal 012), FF (octal 014), and VT (octal 013).
DSCR goes active on the trailing edge of the gated data strobe and
stays active until the printer is primed following the carriage return (and
paper movement) operation.
DCPRM (Decoded Prime)
Generated on LSI chip ME25 pin
8.
Any of the following conditions
will cause DCPRM to go active (low):
(1) Receiving a Delete code (octal 177),
(2) Receiving a low INPUT PRIME signal at the interface connector,
or
(3) A power prime condition (PWRPRM).
CLKTB1 (Clock Shift Register Pulse)
Generated on LSI chip ME25 pin 14. The CLKTB1 pulses is used to
clock input data into the shift register.
It is generated by data strobe
signal DSTA whenever both inhibit levels INH1 and INH2 (internal to the
chip) are inactive.
4-40
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