21xx 486SX-20/25 MHz Level-1 (30 Pin SIMM)
J2 External Battery
J3 Power
J6 Diskette
J7 Parallel Port
-- Serial Port A and B
J8 Hard Disk Connector
J9 Keyboard
J10 Mouse
J11 PINs 1 and 2 = Power On LED
PINs 4 and 5 = Hard Disk LED
J12 Riser
J15 VESA Video feature connector
J16 Display
J45 30-Pin Memory SIMM Socket Bank 0,0
J46 30-Pin Memory SIMM Socket Bank 0,1
J47 30-Pin Memory SIMM Socket Bank 0,2
J48 30-Pin Memory SIMM Socket Bank 0,3
J49 30-Pin Memory SIMM Socket Bank 1,0
J50 30-Pin Memory SIMM Socket Bank 1,1
J51 30-Pin Memory SIMM Socket Bank 1,2
J52 30-Pin Memory SIMM Socket Bank 1,3
JP7 Reset Switch
JP8 Battery Select
JP10 VGA Enable
JP16 PCK Enable
JP23 BIOS Select
JP24 Mouse Enable
JP26 Beeper Enable
U31 Video RAM Socket
U35 Video RAM Socket
U36 Video RAM Socket
U37 Video RAM Socket
U208 486SX Processor
U214 Math Coprocessor Socket
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.