Error Message Descriptions
invalid Vcc chosen ± Retry, Abort
The VCC value you have chosen for your device is invalid.
Use a valid VCC valueÐ0, 5, or 6 volts.
invalid VPP chosen ± Retry, Abort
The VPP value you have chosen is invalid.
Use a valid VPP valueÐ0, 5, 12, 12.5, or 21 volts.
unable to communicate with TMS370 device ± Retry, Abort
The programmer is unable to communicate with the TMS370 microcon- troller. The microcontroller may have bent pins, may be inserted incorrect- ly, or may be inoperable. If you are using the gang programmer, a single bad microcontroller can prevent the programmer from communication with any of the devices.
Check each microcontroller for proper orientation or for bent pins.
unable to program after 25 attempts ± Retry, Abort
The target EPROM location is bad.
Use a different location or replace the target device.
unable to read byte before timeout ± Retry, Abort
The programmer is unable to communicate with the TMS370 microcon- troller. The microcontroller may have bent pins, may be inserted incorrect- ly, or may be inoperable. If you are using the gang programmer, a single bad microcontroller can prevent the programmer from communication with any of the devices.
Check each microcontroller for proper orientation or for bent pins.
unable to write byte ± Retry, Abort
The EPROM is not erased, and the programmer is unable to program a 1, because a 0 has already been burned into the same address.
