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upd052.txt
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Çu▄╜c,t,!%getá└/3u%ef,upd05.txt/%sf,upd05.txt/%bf,upd05.txt/*∞41|qcs| Query Command String
The value of this function is that string of characters`
entered after the name which brought the SAM76 language`
interpreter into action from the operating system.
Γê40|qfs,filename| Query File Size
The value of this function is the file size as a number of`
256 byte records.
~▌39|lff,s0| List File Functions
The value of this function is a list of the functions`
available in the "dsk" disk overlay. Each function name is`
preceded with the string symbolized by "s0".
Ӈ38|qfe| Query File Extension
The value of this function is the current setting of the file`
extension.
}37|sfe,s| Set File Extension
This null valued function presets the file extension to the`
string symbolized by "s". If "s" is made equal to ???, then`
all extensions are accessed. If "s" is made null then files`
with no extensions are accessed.
£36|qdu| Query Directory Unit
The value of this function is the identification of the`
currently active directory unit.
ÆÖ35|sdu,d| Select Directory Unit
This null valued function is used to select the device whose`
number is symbolized by "d".
Å"34At this time only one input and one output file may be`
declared open. Experience in the use of the language`
suggests very little need for simultaneous access to several`
files because of the wide variety of other means of file`
management available within the SAM76 language system. The`
main purpose in providing the foregoing set of functions is`
primarily to permit conversion of "conventional" system`
files to SAM76 organized file structures, or to create`
"conventional" files from SAM76 files.
∙33|wfr,s| Write File Record
This null valued function will write out to a previously`
properly opened file the string symbolized by "s". There is`
no specified limit as to the number of characters in string`
"s".
∩,32|rfr| Read File Record
The value of this function is one record from a file`
previously opened using the "dif" designate input file`
function. Typically this will be 128 characters, except for`
the last record of the file which may be less than that.
",31|dof,filename| Designate Output File
This null valued function is used to open a file for output.`
Such output is attained through use of the "wfr" write file`
record function or through use of the "soc,FIL" function to`
the desired SAM76 language function designed to deliver`
output.
"filename" is defined in the same manner as for the "dif"`
designate input file function. A file is explicitly closed`
by executing %dof/= with no arguments. Exit using control C`
or the "ex" exit function does not close the file.
"?30|dif,filename| Designate Input File
This function serves to open a disk file for access either`
through use of the "rfr" read file record function, or via`
channel control assignment of "FIL" to any of the SAM76`
language functions that are designed to accept input.
"filename" symbolizes the name of the file it is desired to`
access. This may be of the form "name.ext", or just plain`
"name" if the extension has been preset to either "???" or`
some other explicit extension through use of the "sfe" set`
file extension function.
5─29
.]20 File interaction
The file functions which are available to permit assignment`
via the channel control mechanism of SAM76 language`
functions are defined as follows:
║28
.[20 Caution!
The user must be careful to construct procedures in such a`
manner that the system will not be "hung" in a mode that is`
difficult to recover from. Also judicious use of the "nud",`
and "sem" functions should be considered.
°@27|sic,sym| Select Input Channel
This null valued function assigns to the channel whose name`
is symbolized by "sym" one of the two groups of functions:`
if this function is executed actively the assignment is of`
the Group 1 functions, if neutrally the assignment is of the`
Group 2 functions.
6K26|soc,sym| Select Output Channel
This null valued function assigns to the channel whose name`
is symbolized by "sym" one of the two groups of functions:`
if this function is executed actively then the assignment is`
of the Group 1 functions, if neutrally then the assignment`
is of the Group 2 functions.
A±25|loc,s0| List Output Channels
The value of this function is a list of the channel names`
that may be used in the "soc" select output channel`
function. Each name is preceded with the string symbolized`
by "s0". Typical symbol names returned by this function are:
CON Normally the user display unit
PUN Punch
FIL A disk file properly opened with the "dof" function
USR A user provided driver pointed to at location POC
LST A listing device
τ▐24|lic,s0| List Input Channels
The value of this function is a list of channel names that`
may be used in the "sic" select input channel function; each`
name in the value returned is preceded with the string`
symbolized by "s0". Typical of these channel names are the`
following:
CON Console, normally the user keyboard
RDR Reader
FIL A disk file opened with the "dif" function
USR A device whose driver adress is at UIC location
╘≤23
.]20 |the channel|control|family
Means are provided within the SAM76 language interpreter to`
reassociate these two groups with other devices than those`
normally assigned. This is independent of the assignments`
that may be made using the "IOBYTE" if available; note that`
the assignments will however be made within the general`
framework of the IOBYTE setting as modified through use of`
the "sio" set IO function.
Channel control functions are defined as follows:
Θ]22
.[15 |Group 2
This group of functions is normally initialized to interact`
with the so called "Reader" and "Punch" channels {as`
vectored by RI and PO}. Functions in this group are "it"`
input text, "idt" input d texts, "ot" output text, "xu,xmt"`
xperimental user transmit, and "xu,rcv" xperimental user`
receive.
SH21
.[15 |Group 1
This group of functions is normally initialized to interact`
with the user console {as vectored by CI CS and CO}. These`
functions are: "is" input string, "os" output string, "ic"`
input character, "id" input d characters, "im" input to`
matching string, "vt" view text, "tm" trace mode.
>20
.]20 Channel Control
A number of the SAM76 language functions are concerned with`
accepting or delivering data between the SAM76 system and`
the outside world. For convenience two communication groups`
are defined and the initial assignments are as listed below: