AST RESEARCH, INC. PREMIUM II 386SX/25 MODELS 202373-001 & 202373-002 Processor 80386SX(on external CPU/Memory module) Processor Speed 25MHz Chip Set AST Max. Onboard DRAM None (16MB on external CPU/Memory module) Cache None (16KB on external CPU/Memory module) BIOS AST Dimensions 344mm x 250mm I/O Options 16-bit external CPU/Memory module slot 16-bit external Memory module slot (2) bus mouse port, floppy drive interface IDE interface, parallel port, serial port (2), SVGA port NPU Options 80387SX(on external CPU/Memory module) [Image] CONNECTIONS Purpose Location Purpose Location SVGA port CN1 Front panel switches P5 & LEDs Bus mouse port CN2 Speaker P6 Serial port 1 (COM1) CN3 External battery P8 Parallel port CN4 IDE interface P11 Serial port 2 (COM2) J15 Fan power P101 VGA pass-through J18 16-bit external S1 CPU/Memory module Floppy drive interface P3 16-bit external S2 Memory module slot Third floppy drive P4 16-bit external S3 interface Memory module slot USER CONFIGURABLE SETTINGS Function Switch SW1 Position » VGA port enabled switch 1 closed VGA port disabled switch 1 open » Password check enabled switch 2 open Password check disabled switch 2 closed » Factory configured - do not alter switch 3 open » Factory configured - do not alter switch 4 open » Factory configured - do not alter switch 5 closed » Factory configured - do not alter switch 6 closed » Monitor type select PS/2 style switch 7 closed Monitor type select AT style switch 7 open » Monitor type select VGA or switch 8 open fixed-frequency Monitor type select switch 8 closed multi-frequency [Image] USER CONFIGURABLE SETTINGS Function Jumper Position » Parity check enabled E1 closed Parity check disabled E1 open Note:AST CPU/Memory module part number is 202438-004. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (1) 1M x 9 NONE NONE NONE 2MB (1) 1M x 9 (1) 1M x 9 NONE NONE 3MB (1) 1M x 9 (1) 1M x 9 (1) 1M x 9 NONE 4MB (1) 1M x 9 (1) 1M x 9 (1) 1M x 9 (1) 1M x 9 4MB (1) 4M x 9 NONE NONE NONE 5MB (1) 1M x 9 (1) 4M x 9 NONE NONE 6MB (1) 1M x 9 (1) 1M x 9 (1) 4M x 9 NONE 7MB (1) 1M x 9 (1) 1M x 9 (1) 1M x 9 (1) 4M x 9 8MB (1) 4M x 9 (1) 4M x 9 NONE NONE 9MB (1) 1M x 9 (1) 4M x 9 (1) 4M x 9 NONE 10MB (1) 1M x 9 (1) 1M x 9 (1) 4M x 9 (1) 4M x 9 12MB (1) 4M x 9 (1) 4M x 9 (1) 4M x 9 NONE 13MB (1) 1M x 9 (1) 4M x 9 (1) 4M x 9 (1) 4M x 9 16MB (1) 4M x 9 (1) 4M x 9 (1) 4M x 9 (1) 4M x 9 Notes:16KB of SRAM Cache is on the CPU/Memory module. 128KB of DRAM is reserved for System and VGA BIOS shadowing and cannot be disabled. Up to two of the following memory boards may be installed in addition to the CPU/Memory module: AST part numbers 202275-001, 202275-004, 202275-006, 202387-001, or 202387-005.