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Incorrect command line parameters.
The loader selects all emulators involved in a transfer and then verifies that the last one responds before
starting the transfer. The /Sxx and /Wyy parameters must add up to less than or equal to the total number of
bits in the download chain. For example, if you used /S16 /W32 (skip 16 bits then load 32 bits), you had
better have 48 bits of emulators attached. This could be made up of three 16 bit emulators, six 8 bit
emulators or some combination of the two. If you have less than 48 bits, the loader will complain because
the last emulator involved in the transfer did not respond.
Target is not powered up.
Econo ROM II draws its operating power from the target’s EPROM socket. The target must be powered up
during all load or verify operations. If multiple emulators are daisy-chained, they must ALL be powered up
to load to ANY of them.
Target power is noisy or Voltage too low.
Econo ROM II 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. This is a rare condition, but worth mentioning
Fails Verify
File too large
The file may be too large for the emulator, causing the data to wrap-around or to be truncated. For
example, an ER2-1M can hold up to 1Mbit of data (128Kbytes). Any file larger than 131,072 bytes would
overflow an ER2-1M. Look at the file size and verify that it is less than or equal to the emulator’s
maximum size.
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. Econo ROM II 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.
Transfer speed set too high for this port.
The transfer reliability is verified by the ER2TEST program. Make sure you are not trying to use a faster
speed than the test program recommended.
Also note that the test program tested the transfer speed to a single emulator. If you are daisy-chaining
several emulators, their combined load can slow down the printer port rise times, resulting in a need to
further slow down the transfer speed to avoid over-running the port signals. Try the next slower transfer
speed (/D0 is the fastest speed, /D2 is the slowest speed).
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.
Econo ROM II User’s Manual
8
Copyright ? 1996, TechTools
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