 The RAM was later reinstated to 4 KB on the "T425" (in 20, 25, and 30 MHz varieties), which also added the J 0 breakpoint support and extra T800 instructions.The "T400", released in September 1989, was a low-cost 20 MHz T425 derivative with 2 KB and two instead of four links, intended for the embedded systems market.The second-generation "T800" transputer, introduced in 1987, had an extended instruction set.