It was only sold in Asia circa 1993. It was similar to the 90-20 but used a different processor. A few of them ended up in North America on machinery imported from Japan or Singapore. We have replaced a few of these with GE Fanuc Micro PLCs, but one needs to re-write the logic and re-wire the I/O.
If you do not want to replace this, your best bet for parts or programmers is going to be the machine supplier.