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FabiaTech Corporation
Parallel Ports
Register Address
Port Address
Base + 0
Base + 0
Base + 1
Base + 2
Printer Interface Logic
The parallel portion of the SMC37C669 makes the attachment of various devices
that accept eight bits of parallel data at standard TTL level.
Data Swapper
The system microprocessor can read the contents of the printer's Data Latch
through the Data Swapper by reading the Data Swapper address
Printer Status Buffer
The system microprocessor can read the printer status by reading the address of
the Printer Status Buffer. The bit definitions are described below:
NOTE: X represents not used.
Read/Write
Write
Read
Read
Write
7
6
5
4
3
60
Register
Output data
Input data
Printer status buffer
Printer control
latch
2
1
0
X
X
X
-ERROR
SLCT
PE
-ACK
-BUSY
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