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B. S PUNc-rIORS OF !'lIB PRIRTBk COIIftOLLBR
Printer Controller is mainly composed of the following three
registers.
- Data Register
(Read/Write 318H)
- Status Register
(Read 319H)
- Control Register
(Read/Write 31AH)
B.S.I Data register output (318H)
Bit
7
6
5
4
3
2
1
0
Data7
Data6
DataS
Data4
Data3
Data2
Data 1
DataO
By
this register, 8-bit write data is set.
These bits are
sent to the printer through the driver (LSOS).
B.S.2 Data register input (318H)
By
this register, the response data from the printer
connector can be read.
This function is used for wrapround test, and is used also
for data input from external devices connected to the
connector.
In this case, the driver must be set to "0".
All this operation is controlled by the control register
explained afterwards.
B - 11
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