AST RESEARCH, INC. PREMIUM II 386SX/20 (MH Version 1) MODELS 202373-001 & 202373-002 Processor 80386SX(on external CPU/Memory module) Processor Speed 20MHz 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 CN3 External battery P8 Parallel port CN4 IDE interface P11 Serial port 2 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 Position » VGA port enabled SW1/switch 1 Closed VGA port disabled SW1/switch 1 Open » Password check enabled SW1/switch 2 Open Password check disabled SW1/switch 2 Closed » Factory configured - do not alter SW1/switch 3 Open » Factory configured - do not alter SW1/switch 4 open » Factory configured - do not alter SW1/switch 5 Closed » Factory configured - do not alter SW1/switch 6 Closed » Monitor type select PS/2 style SW1/switch 7 Closed Monitor type select AT style SW1/switch 7 Open » Monitor type select VGA or SW1/switch 8 Open fixed-frequency Monitor type select SW1/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 202337-001 or 202337-002. 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 202275-004, 202275-006, 202387-001, or 202387-005.