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'Lt.
~-
...s;
st'!an
Bit Buffer Channel
Scan
1word
1
II
3
Character Buffer Channel
Word Buffer Channel
Note:
The timing will vary depending
upon the speed of transmission
for the various buffer.
Char
Buffer
Figure 15. Relative Timing for Scanning Buffers
Functional Sequence
The normal flow of data occurs as shown below. The program periodically halts to allow the
SCN instruction to take bits from the bit buffers to form characters in memory. When a charac-
ter is formed, it is transferred over to another area of memory where the program accumulates
characters into words.
The words are accumulated fato blocks of variable lengths and then
transferred to the disc storage unit, where the queue, journal, intercept, and in-transit storage
areas are established under program control. The same basic process occurs for the character
and word buffers. However, all other buffers must be scanned by the program.
[ID&IJ&~~IJCJ ~@------------
V-4
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