Commands - Texas Instruments 990 Operation Manual

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945255-9701
Since the PROM is four bits wide, each increment of four bits gets a new bit string address which also is
a new PROM word address. Therefore, as bit strings are selected from memory, they are programmed
into consecutive words of PROM for 256 words.
7.5 COMMANDS
The following paragraphs contain detailed descriptions of the PROM Programmer commands. The
following symbols and conventions are used in defining the syntax of the commands:
• Angle brackets
«
»
enclose items supplied by the user.
• Brackets ([ ]) enclose optional items.
• An ellipsis ( ... ) indicates that the preceding item may be repeated.
• Braces ({ }) enclose two or more items of which one must be chosen.
7.5.1 PROM PROGRAMMER STANDARD (PS). The PROM Programmer Standard command
searches the Standard Control Infonnation Cassette for the specified records which contain the
memory and/or PROM control infonnation.
Syntax definition:
PS
{t,' ... }
<char string 1>
[to' ... }
<char string 2> ]
l.
Parameters:
char string 1
char string 2
Name of first record of control infonnation for a standard PROM
or memory configuration. Required parameter.
Name of second record of control infonnation for a standard PROM
or memory configuration.
Parameter default value:
Iichar string 2 is not specified, it is omitted.
Description: This command is used to input the control infonnation for the standard memory and
PROM data configurations. The user may specify a search of the tape for both memory and PROM
control infonnation to be used in the programming process or may specify a search for only memory or
PROM control infonnation. If only one data configuration, either memory or PROM, is specified, any
control infonnation previously defined for the other typt; of data configuration remains unchanged.
When all character strings given in the command have been matched to a record on the Standard
Control Infonnation Cassette, control is returned to the monitor. The user need not rewind the
cassette if the next record of infonnation to be read from the cassette when the user inputs the
command again is positioned further along the cassette from the last record which was read.
The Standard Control Infonnation Cassette must be positioned on the cassette drive assigned to logical
unit number 7. Records are read from the cassette, and if a record with a name matching either
character string is found, the record is stored for use by the program. The search is continued from that
7-9
Digital Systems Division