-24- MBM-530NS User’s Manual
1.6 Parallel Port
(1) Register Address
Port Address
Read/Write
Register
base + 0
Write
Output data
base + 0
Read
Input data
base + 1
Read
Printer status buffer
base + 2
Write
Printer control latch
(2) Printer Interface Logic
The parallel port of the NSPC87309 is for attaching various devices
that accept eight bits of parallel data at standard TTL level.
(3) 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.
(4) 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 as
follows:
X
X
X
1
2
3
4
5
6
7
0
-ERROR
SLCT
PE
-ACK
-BUSY
Summary of Contents for MBM-530NS
Page 1: ...MBM 530NS User s Manual...
Page 4: ...4 MBM 530NS User s Manual...
Page 8: ......
Page 12: ......
Page 58: ......
Page 91: ...Web site www formosa21 com MBM 530NS User s Manual 91 when user tries to enter Setup utility...
Page 96: ......