ZiLOG Z80-RIO Operating System User's Manual page 36

Tabs can be altered in the file OS (from the PROM Debugger)
to change the default tab settings of every eight
columns. Different tabbing environments can be
established and made into a file so that they may be
altered by command (see Sections 5.37 and 5.38).
The following I/O requests are honored by CON:
INITIALIZE (OOH)
ASSIGN (02H)
OPEN (04H)
CLOSE (06H)
READ BINARY (OAH)
- Reads the current date into the
default attributes table (see OPEN
below) and sets default ~tatus area.
- Null operation returns
operation complete
- If data length
=
0: null operation.
Otherwise up to 20 bytes can be
requested from the default set of
attributes including:
Type
Record Count
Record Length
Block Length
Properties
Starting Address
Bytes in last record
Creation Date
20H (ASCII)
o
80H
80H
o
o
o
Current Date
- Null operation returns operation
complete
- Data length c~racters are received
from the console. Entering a
control-D (ASCII EOT, 04H) causes
an end-of-file mark (FFH) to be
placed in the buffer and the request
terminated. Data length is reset to
the actual number of characters read.
The parity bit of each character is
reset.
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