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Section A:
System interface
If an output device is referred to,
the character is sent to all mapped
output
devices.
EOS waits until the current device is ready to
accept
the
character,
before referring to the next device,
The wait interval
may
be set by system function 73.
Should the wait time elapse
without
the device becoming ready, a message is displayed on the screen:
Device <name> not ready
The
construction
"<name>
11
is replaced by the name
of
the
non-ready
physical device.
Then, the input device CONIN: is checked for a pending
character.
If so, the character is read and the output operation abort-
ed.
If
the
printer is switched parallel to the output device,
it
is
switched off, too. If there has no key been touched on the keyboard, the
wait cycle will be repeated.
Physical
device 3 is treated specially,
as it is declarated as
a
CRT
terminal.
As a consequence,
no error messages will be displayed if the
CRT
screen
is not ready.
If the printer is switched parallel
to
the
screen
due to an entry of the Ctrl-P character (see EOS functions l and
10) and the printer itself is assigned to the CRT terminal,
no
printer
echo will take place to inhibit double printing on the screen.
The following devices have been implemented on the MZ-3500:
The
SCREEN
KEYBD
RS232
CENTRO
CE332P
GRAPH
DUMMY
- the CRT screen
- the keyboard
- the built-in V24
I
RS232 interface
- the built-in Centronics interface
- the SHARP CE-332P printer
- the graphics interpreter
- a
dummy device,
which accepts any kind of output
and
always returns lAH (Control-Z,
the end-of-file charac-
ter) for input.
BAUD byte holds the following information on the RS-232-C interface:
0
50 baud
8
1800 baud
1
75 baud
9
2000 baud
2
110 baud
10
2400 baud
3
134 baud
11
3600 baud
4
150 baud
12
4800 baud
5
300 baud
13
7200 baud
6
600 baud
14
9600 baud
7
1200 baud
15
19200 baud
If bit 7 is set, the transfer format is 5 data bits and 1 1/2 stop bits,
otherwise 8 data bits and one stop bit.
Even parity can be specified by
setting bit 6,
otherwise,
parity is suppressed. To alter the BAUD byte
contents, use EOS function 50 (see also section C, function 21),
EOS System manual
Daeumling & Zimmermann
Page 6
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