 It was the last family of low-end VAX systems, as the platform was discontinued by Compaq.The VAX 4000 Model 300, code-named ""Pele"", was introduced on 9 July 1990 at DECworld in Boston, Massachusetts, replacing the MicroVAX 3800 and 3900.It used the time-sharing KA670-AA CPU module containing a 35.71 MHz (28 ns cycle time) Rigel chip set with a 128 KB external secondary cache protected by ECC built from 84 ns SRAM.