We have a hitachi seiki "HC400" and it has a strange memory issue. This machine has 512k "1280 meters" according to the base 0 board and the program screen. When we try to send a program to the machine over 1162 meters of tape, the control hangs. We sent out the base 0 board for repair and were told that there was nothing wrong. We swapped the ram board from another machine to test that as well with the same results. I have checked the programs and there is no stop codes except the begining and at the end. The machie has a "micon 16" slave controller on board as well. We have had maintenance come out to our shop and they can not find anything wrong as well.