TANDY/RADIO SHACK 4825 SX Processor 80486SX/80487SX/80486DX/80486DX2 Processor Speed 25/33/50(internal)/66(internal)MHz Chip Set Unidentified Video Chip Set Unidentified Maximum Onboard 32MB Memory Maximum Video 1MB Memory Cache None BIOS Unidentified Dimensions 394mm x 381mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location VGA port CN1 IDE interface CN8 PS/2 mouse port CN2 External battery J1 Parallel port CN3 Speaker J2 Serial port 2 CN4 Reset switch J3 Serial port 1 CN5 Power LED J4 VGA feature connector CN6 Riser slot SL1 Floppy drive interface CN7 USER CONFIGURABLE SETTINGS Function Label Position » CMOS memory normal operation JP1 Open CMOS memory clear JP1 Closed » Monitor frequency select 31KHz SW1/5 Off Monitor frequency select 40KHz SW1/5 On » Monitor type select color SW2/3 Off Monitor type select monochrome SW2/3 On DRAM CONFIGURATION Size Bank 0 Bank 1 4MB (4) 1M x 9 None 5MB (4) 1M x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 None 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 VIDEO MEMORY CONFIGURATION Size Bank 0 Bank 1 512KB 512KB None 1MB 512KB 512KB Note: The location of banks 0 & 1 are unidentified. The size of the video memory chips are unidentified. VIDEO MEMORY SWITCH CONFIGURATION Size SW1/6 512KB On 1MB Off CPU TYPE SELECTION Type SW2/1 SW2/2 80486SX Off Off 80487SX On Off 80486DX Off Off 80486DX2 Off Off VIDEO RESOLUTION SELECTION (800 X 600) Frequency SW1/1 SW1/2 » 56Hz Off Off 60Hz Off On 72Hz On Off 56Hz On On VIDEO RESOLUTION SELECTION (1024 X 768) Frequency SW1/3 SW1/4 » Interlaced Off Off 60HZ non-interlaced Off On 70HZ non-interlaced On Off Interlaced On On ON BOARD VIDEO SELECTION Setting SW1/7 SW1/8 » Enabled On Off Disabled Off On