Texas Instruments TMS370 - Manual (Page 87)

Error Message Descriptions
B-3
invalid Vcc chosen – Retry, Abort
The V
CC
value you have chosen for your device is invalid.
Use a valid V
CC
value—0, 5, or 6 volts.
invalid VPP chosen – Retry, Abort
The V
PP
value you have chosen is invalid.
Use a valid V
PP
value—0, 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.