Radio Shack TRS-80 Service Manual page 13

Testing Procedure
Save the test program on a cassette tape through a cassette tape interface unit by the
operation SAVE A !EXEI.
(1) Install a RAM module into the test unit ( PC- 4
L
(2) Push the ALL RESET button on the bottom of the test unit.
(3) Connect the PC - 4 to a cassette tape interface and a tape
recorder which contains a test program cassette tape.
(4) Load the test program from the cassette tape by the operation LOAD A IEXEI.
(5) After loading the Program change the PC- 4 to WR ITE mode by the operation
I
MOD Ell and confirm that the remaining program step is 789.
(6) Operate IMODEI 0 (RUN mode selection).
(7)
Execute PO (Program numberO).
(8) Confirm the display "TEST 1 OK".
(9) Clear the programs PO to P5.
Example to clear P2 ...
(a)
I
SH IFT
I
2 (P2 designation).
(b) IMODEI 1 (WRITE mode selection).
(c) CLEAR IEXE! (erasing P2).
Note: ISHIFTI is the red S button.
(10) Change the PC-4 to RUN mode by IMODEI 0 [fX]].
(11) Operate DEFM 1761EXEI.
(12) Execute P9.
Confirm the display 'TEST OK! "
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