NEC PC-8201A - Page 162

Chapter 8
CONTROL ACCORDING TO "x" PARAMETER:
X : Affects Control
N Does Not Affect Control
CONTROL ACCORDING TO SHIFT IN/OUT SEQUENCE:
S Affects Control
N Does Not Affect Control
Parity bit ignore designation must be used with an 8 bit word
length. When a parity error occurs during the operation of
TELCOM, this error will not be recognized as an error. Data will
still be considered good.
The capacity of the input buffer is up to 250 characters. When
data is filled to within 23 characters in the buffer, the PC-8201 will
output a CTRL + S code (19) and request a temporary cessation of
data transmission from the other end.
When the buffer is empty, a CTRL + Q (17) is output and
resumption of transmission will be requested. In the same manner
when data is transmitted and a CTRL + S code is received, the
PC-8201 will accept that code as a control signal and not as
data. It will also stop transmission until a CTRL + Q code has been
sent.
If you need the display to scroll by one line then preparation is
required if data is to be transmitted to a printer. This is why if a
data transmission control is not conducted by the X parameter during
high speed data transmission, the buffer will immediately overflow
and the transmitted data will be lost.
See the Table of Control Codes in this chapter for details
on the CTRL functions and the corresponding codes.
8-7