please try this version, it was hard to find the error, because it came in the middle of a block load, the problem was that i set address of unpack temp data to 5b24h which does not cause any problem in any other case, but on 128k config the 1st unpack happens when this address on FF segment, and it cause that a small block (about 64 bytes) is corrupted during loading with tape config, and this is a packed data, which result total corrupted unpacked data.