Texas Instruments 990 Operation Manual page 31

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2. Place the 733 ASR data terminal on line. (The deviCe function switches (12 through
15) must be set to the LINE position.)
3. Load and ready the cassette containing the program to be run in either transport drive.
4. Set the TAPE FORMAT switch (11) to LINE.
S. Place the selected cassette in playback mode by setting the PLAYBACK/RECORD
switch (6) in the middle of the top row of the data terminal's upper switch panel to
the PLAYBACK position for that cassette. The PLAYBACK and RECORD indiCator
lamps (2, 3, 8 and 9) indiCate the mode of each cassette drive.
6. Press the RESET and LOAD switches (18 and 17) on the programmer panel to initiate
the load. The Playback Control ON indiCator lamp (5) on the data terminal's upper
switch panel lights to indicate that data is being transferred.
7. When the load is completed, the loader will transfer control directly to the program if
the program contained an entry vector. (An entry vector is a special tag generated by
the assembler indicating the starting location for the program. The tag is generated if
the user includes the starting address for his program in the END statement.) If there
is no entry vector or if an error occurs during loading, the loader returns control to
the programmer panel.
8. The cassette should be rewound by pressing the REWIND side of the REWIND/STOP
switch (1 or 10) on the upper switch panel of the data terminal and removed to
prevent accidental reuse. The tape is finished rewinding when the END indiCator lamp
(4 or 7) lights.
2.5.2 . LOADING COMPRESSED ABSOLUTE FORMAT OBJECT MODULES. Compressed
absolute format code may be loaded using the 733 ASR ROM loader by including the upfront
loader in front of the compressed absolute format code module. Refer to the Load with Upfront
Loader (LU) command in Section III for a further description of the upfront loader .
. To load with the up front loader, follow the procedures described· in paragraph 2.5.1. The
upfront loader is loaded at the ROM loader default bias address, AO
16'
After the up front loader is memory resident, control is passed to it and the compressed absolute
load initiated. Once the absolute format module is loaded, control is passed to it if an entry
. point has been found. If there is no entry point or there is a load error, control is returned to
the programmer panel.
If the user wishes to perform a bootstrap load with the up front loader, but would like the
up front loader at a different point, he may add to the up front loader object module a D tag
(load bias) character as the first record.
2.5.3 LOADING THE MONITOR; To load the monitor, mount the cassette containing the
up front loader and PX9MTP and load it in the manner described in paragraph 2.5.1. A period (.)
is printed to indiCate that the monitor is loaded and ready to accept commands.
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Digital Systems Division .