Radio Shack TRS-80 DT-1 User Manual

___ IJI'_-_l TRS-aO ® Own_e_r_'_s_Man_u_al _
When the Printer goes not BUSY, the DI'-l will transmit a CONI'ROL
Q (XON), which signals the Host ta continue data transmission.
When the IJI'-l is used with rrost parallel printers, the input
data ta the Terminal will be passed ta the Printer on a
character by character basis. The Printer will store these
characters into its memory until one of two conditions
occur:
The Printer receives a carriage return, or
The Printer's buffer is full.
At either of these two points, rrost printers will activate
the busy Une, and the Printer will print that line or the
buffer contents. At the point where the Printer went BUSY,
the IJI'-l will transmit a CONffiOL S, which should stcp the
Host fran sending rrore data. The effect you see on the
SCreen will be a transmission pause at the end of each Une.
The Printer will allow the DI'-l ta tell the Host ta continue
when that Une has been printed.
If a paraI leI printer sets the BUSY line after each
character and i t is BUSY for longer than one character tirœ
(determined by baud rate), the DI'-l nay detect the BUSY
signal after each character is sent ta the Printer. In such
a case, the DI'-l nay transmit CONI'ROL S and CüNffiOL Q's upon
each character. The Line Printer III (26-1156> is the only
Radio Shack printer which will exhibit this characteristic.
The effect on the Screen will be an apparent decrease in
received baud rate.
vmile rrost IJI'-l cperations are controlled by the Host
System, there are tirœs when you need ta perform special
cperations "l
oc
ally". For instance, suppose you want the
Printer ta start printing but, when you transmit the codes
ta start the Printer, the Host does not ECho the code. You
need ta give the coonand in Local M:xle.
In Local MJde Operation, codes that control special
functions are not sent ta the Host but are acted upon just
as if they were recei ved fram the Host.
There are two Local Made sequences -- Escape Codes and
COntrol Codes. For a description of Escape and COntrol Codes
available with your IJI'-l, see Appendix D.
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Radio Shack TRS-80 DT-1 Specifications

General

Brand	Radio Shack
Model	TRS-80 DT-1
Category	Desktop
Language	English