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Special Data Words
Some examples of special data words and their representation in memory are given below. These
examples are intended to show a way of representing the data; other representations are possible.
Characters (five-level Teletype) could be represented in memory in the following ways (and more)
with the choice depending on the particular application.
oxxxxx oxxxxx oxxxxx
18
1312
7 6
1
000
xxxxxxxxxxxxxxx
18
16 15
ll 10
6 5
1
0
x x x x x
1 1
c
0
x x x x x
1 1
c
18
10 9
a character
a character
WORD IN
MEMORY
control information (or not used)
a character
a character
a character
a character
start bit
data bits
stop bits
control information(or not used)
Eight-level Teletype characters can be stored conveniently in memory as six-bit characters
because the DATANET-30 has special instructions to facilitate stripping off and checking the
parity and control bits when a character is received and generation and insertion of parity and
[ID&1J&~~1J~ ~@------------
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