ER3-8M TechTools, ER3-8M Datasheet - Page 18

• Manufacturer Part Number: ER3-8M
• Description: EMULATOR EPROM ECONOROM III 8MEG
• Manufacturer: TechTools
• Series: EconoROM™ IIIr
• Type: Memoryr

Specifications of ER3-8M

• Contents: ER3 EconoROM III Emulator, Cables (Daisy-chain, LPT and Target) and more
• For Use With/related Products: EPROMs
• For Use With: CBL08-25 - 25 FT DOWNLOAD CABLE UPGRADEC32D-6 - 6" TARGET CABLE IDC TO 32PIN DIPC28D-6 - 6" TARGET CABLE IDC TO 28PIN DIPPS-RT1 - EXTERNAL PWR SUPPLY
• Other names: ER38M

Target power is noisy or Voltage too low.
EconoROM 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. This is a rare condition, but worth mentioning.
If the target voltage (at the memory socket) is less than 4.5V, then an external power supply MUST be
connected to the emulator.
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
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 ER3-1M can hold up to 1Mbit of data (128Kbytes). Any file larger than 131,072 bytes would
overflow an ER3-1M (as well as a 1Mbit EPROM/FLASH). Look at the BINARY file size and verify that
it is less than or equal to the emulator’s maximum size.
If you are working with HEX files, note that the size of the HEX file is irrelevant. Look for ‘out-of-range’
messages during the HEX conversion.
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. EconoROM 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 ER3TEST program verifies transfer reliability. Test the
desired transfer speed reliability with “ER3TEST /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
ER3TEST 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.
EconoROM III User’s Manual
14
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