It is possible to get corrupt programs on a Haas without a hard drive. Certain key sequences in the editor will corrupt the program that is being edited.
Normally it is possibel to save everything to disk, Delete ALL, then reload from the disk. Sometimes this is not possible and you have to get the controller operating system reloaded after a complete purge of the system.
If you have already tried the delete all and found it will not work the only suggestion I have is try to load a program of the same name from a floppy and see if you can overwrite the corrupted program with a good one. This worked for me once, but several times I have had to have a machine lobotomized to get rid of a corrupt program.
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