NEC PC-8201 - Serial Interface

3.1.8 Serial Interface
The serial interface uses an RS-232C. S101. or S102. switching them one another, by
USART IM6402.
-
* Interface Switching
OUT 90
SEL A SEL B
0 0 NOT USED
0 1
S102
1 0 SIO 1
1 1 RS-232C
7 6
*
Load to USART and control register
SEL A
OUT D8
SEL B
CLS2 CLSl PI EPE SBS
SBS
0
1
EPE
0
1
CLS 2 CLS 1
0 0
0 1
1 0
I 1
STOP BIT SELECT
Stop bit length
1 bit
If the length
of data is 5 bits, it is 5 bits.
In other cases, it is 1.5 bits
ODD PARITYIEVEN PARITY
Odd parity
Even parity
DISPLAY PARITY
Parity generation check
Disable parity generation check
DATA LENGTH
5 bits
6 bits
7 bits
8 bits