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Inputs
{
from
EDS
Switches
Shift (Upper or Lower Case}
A
*Note: Some Models Use Diode Matrix in Place of SLD Logic
Figure 1-13. Encode Circuits (Example)
Bit Latch
FL
2 Bit
4
Bit
Figure 1-14. Restore Bail Interposer and Latch Key Interposer Comparison
Bail Drive Card
A SMS drive card, mounted below the keyboard, is used to
drive the restore bail magnets.
It
is
con~rolled
by the using
system. The using system prevents the flow of current
through the magnets which restores the keyboard during
operation or locks the keyboard when not in use.
Shift Key
The SHIFT key shifts the keyboard into uppercase, causing
the character key output to be coded differently. The
shift key operates the same as any momentary key. The
SHIFT key is not interlocked because other keys must be
operated with it.
Some models have a SHIFT key LOCK (Figure 1-15) that
allows continuous uppercase operation. When the LOCK
key is pressed, the turned-over ear pivots the latch against
the lock bar. Additional pressure causes the keylever to
Figure 1-15. Shift Key Lock Mechanism
(Data Available)
Restore Bail
Latch Key lnterp~ser
Shift Key
Elastic Diaphragm Enc Kybds and 5475 Data Entry Kybd
(3/71)
1-9
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