Toshiba Corp will supply Sun Microsystems’ Japanese subsidiary with upgraded versions of its SPARC LT model laptop engineering workstations starting next month. The company said it will supply an annual 2,000 units to Nippon Sun Microsystems KK to be sold in Japan under the Sun brand name. Toshiba expects to sell 4,000 units under its own brand name by the end of March 31, 1992. The SPARC LT workstation, based on Sun’s 32-bit RISC chips, are capable of processing 17.5 MIPS and come with a 329Mb hard disk drive. Toshiba said it won’t export the machines in the near future.