Taipei, Taiwan company Umax Data Systems has formed Umax Computer Corp in Fremont, California to help it market its new Power Macintosh clones. Umax, which licensed Mac OS from Apple Computer Inc earlier this year, is aiming right for the top end of the market, offering what it claims is the most powerful computer available for the Mac OS market, the SuperMac S900 mini-tower system. Using single or dual 150MHz PowerPC 604 processor, the SuperMac S900 is designed to provide Unix workstation- class performance. It has 512Kb second level cache, up to 1Gb main memory, 6.7 times standard speed CD-ROM drive, 1.4Mb floppy, six PCI slots, and five drive bays. The PowerPC is on a user-replaceable processor board. The SuperMac S900 was designed with power supply and cooling to accommodate more powerful processor boards. An optional feature board provides Ultra-Wide SCSI support for 16-bit wide data transfer at up to 40M-bytes per second, and 100Base-T networking. Out next month, it is $4,000 with 16Mb processor and 4Mb Video RAM on an 128-bit graphics accelerator, and a 2Gb disk; $3,100 without the disk and graphics subsystem. A second 150MHz 604 is $1,000.