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EPROM it is replacing. If the target is a very low power system, or is already pushing its power supply
limits, it may not have enough current to spare to power the emulator, causing power fluctuations or noise.
Emulator too slow
Econo ROM IIs are rated at 45ns or 90ns. The last two digits of the part number specify the emulator’s
speed. The emulator must be at least as fast as the access times required by the target (smaller numbers are
faster). If the target’s access requirements are not documented, you can get a general idea of its
requirements by looking at the EPROM’s rating. The EPROM’s speed is not an absolute indicator because
many EPROMs run faster than they are marked; particularly at full voltage and room temperature. We have
seen many systems that appear to run fine, even though their access times routinely violate the EPROM’s
rating. Fortunately, Econo ROM IIs generally run faster than rated as well!
Bad Code
Remember, the one variable that is always changing in this set up is the code itself! If you keep a baseline
code image on hand that is known to work, you could always load that image into the emulator as a sort of
sanity check.
If these tips did not solve the problem you
are experiencing, please call our technical
support people at any of the numbers listed
on page 1.
Econo ROM II User’s Manual
11
Copyright ? 1996, TechTools
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