Toshiba AS311 - Manual (Page 28)

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ASCII Interface Module (AS311)
4. Register Configuration
4.2 AS311 buffer memory
As explained in the previous section, the I/O registers that are assigned to AS311
are used to control the reading and writing timings (handshake) between T3 and
AS311.
On the other hand, for exchanging the transmission data between T3 and AS311, the
AS311’s buffer memory is used.
This section explains the buffer memory contents and how to access the buffer
memory.
4.2.1 Memory map
The AS311 has the buffer memory that is used to exchange data with T3. The overall
map of the buffer memory is as follows.
Address Word data
0 Status and command 4 words - same data as I/O registers
4 Parameter
124 words - transmission parameters, etc.
128 Channel 1
reading (receiving)
data area
448 words
576 Channel 1
writing (transmitting)
data area
448 words
1024 Channel 2
reading (receiving)
data area
448 words
1472 Channel 2
writing (transmitting)
data area
448 words
1920 Access inhibited
128 words