DOS ERROR $89
A few people, while compiling their Kyan Pascal programs, have come across an error message that reads:
pc: DOS error on file: D1:filename.p
89 - Error code
This matches the DOS 2.5 error 89 (truncated) and happens when there are more than 256 characters including EOL on one line. So, if your source code e. g. has a large comment section, it should be broken into smaller groups. This is not a bug; it is just the way the Atari 8-bit computer works. Its I/O is limited to a record length of 256 bytes.