Quote Originally Posted by eeguru View Post
As long as it's combinatorial only 'L' variant. If its an 'R' or 'V' registered variant (containing flip-flops), it becomes more difficult. If the security bits are not set, you could just read the fuse data out with a programmer.
Tandy appears to have only used 82S153s when they needed programmable logic in the 1000 and its initial add-on boards. They are simple combinatorial logic chips that can be easily replaced.