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Target power is noisy or Voltage too low.
FlexROM III draws more current than the 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 extra current to power the emulator,
causing power fluctuations or noise.
If the target voltage (at the memory socket) is less than 4.5V, then an external power supply MUST be
connected to the emulator.
NOTE: The power may look good while the target is in reset but become noisy or droop once the target
starts running.
If the emulator is being powered from the target, ensure that the memory socket the emulator is plugged into
has sufficient by-pass capacitance ( a good idea for EPROMs as well!).
Fails Verify
Target Power noisy or Voltage too low.
Noise problems are very dynamic. It is possible that we could identify the emulators but be unable load and
verify properly. FlexROM III draws more current than the 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. An external power supply would solve this.
Transfer speed set too high for this port (16bit loaders only).
The 16bit software is capable of over-running some printer ports. You may need to reduce the speed to
achieve reliable operation in these situations. The RTTEST16 program verifies transfer reliability. Test the
desired transfer speed reliability with “RTTEST16 /dx” (where x is 0,1,2,3 or 4). /d0 is the fastest
setting.
If you are daisy-chaining several emulators, their combined load can slow down the printer port rise times,
resulting in a need to slow down the transfer speed to avoid over-running the port signals. Run the
FR3TEST program with the emulators daisy-chained together to properly reproduce the eventual working
environment.
A print spooler or TSR is interfering with our port accesses
Try “booting” clean from a DOS diskette to see if things stabilize. If this corrects the problem, suspect that
some other program (like a print spooler) is interfering with our access to the port.
Printer port set to an incompatible mode
If your printer port is configurable through BIOS settings, try each configuration. Some ports will perform
better in STANDARD, AT, NIBBLE or COMPATIBLE mode. Others will allow higher transfer speeds
when configured for ECP, EPP, PS2, HIGH-SPEED or similar settings. This is rarely a problem.
FlexROM III User’s Manual
27
Copyright ? 2001, TechTools
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