Replacing ASR-1
O/88
Modules
Replacing the O.S. EPROMs
The ASR-10 operating system can be updated by replacing the O.S. EPROMs. Each ASR-10
has two Operating System EPROMs located on the digital board near the OTTO chip (U29).
Removing 1.
2.
Installing 3.
IMPORTANT!
4.
5.
6.
7.
8.
9.
Remove all cables connected to the ASR-10, including the power cord.
Turn the unit upside-down and remove all the screws from the base and rear panel.
The two Operating System EPROMs, LOWER (U19) and UPPER (U22), are located in
the center of the digital board next to the OTTO chip (see Figure 15). Carefully remove
the two EPROMs and insert the replacement EPROMs into their respective sockets. Be
sure the notch in each EPROM is facing away from the SIMM sockets.
Make sure all audio cables are unplugged BEFORE turning the unit on. The first
time you turn on the ASR-10 after updating the software, the unit may make a pop.
Check the software version by pressing the Command then Env 1.
Using the right or left arrow button, scroll until the display shows SOFTWARE
INFORMATION.
Press
Enter*Yes.
Press the up arrow button until the display shows ROM=XX. The version number
should be the same as that printed on the label of the newly installed EPROMs.
Test the unit.
Replace all the screws on the bottom plate (use no more than 8 in/lbs of torque).
ASR Service Manual
53
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