Table of Contents
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Keyboard Line
Information
Start Pulse
Data Bits
Stop Pulse
Timing
Chain
tl
t2
t3
t4
Operation
Generate Start Pulse
Generate Disable Start Detector
&
transfer bit
00 into Holding Reg.
&
printer
Transfer bit 01 into Holding Reg.
&
printer
Transfer bit 02 into Holding Reg.
&
printer
t5
Transfer bit 03 into Holding Reg.
&
printer
t6
Transfer bit 04 into Holding Reg.
&
printer
t7
Transfer bit 05 into Holding Reg.
&
printer
t8
Transfer bit 06 into Holding Reg.
&
printer
t9
Transfer bit 07 into Holding Reg.
&
printer
tlO
Stop pulse to printer
tll
t12
(tOO)
Timing Chain Cleared Sig., Set Data Read, Clear
Clock control
&
stop pulse to printer
Clear Disable Start Detector Signal.
Table 2-5
TTY Timing Chain Events for Read
Setting of the Data Read FF (Z12, page 17) holds the Busy Status (Z36, page 23),
enables generating a Data Interrupt (Z14, page 17), and enables the computer to
read the contents of the Holding Register (Z13, page 13).
A Busy 23-C06-~
is
used to generate End of Operation signals at 23-C06-2l
l a n d 23-C06-23.
The signal from 23-C06-21 produces an End of Operation Status
2-19
Rev. A
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