CHEERFUL INTERNATIONAL CORPORATION
S680
| 
 Processor  | 
 80386SX  | 
| 
 Processor Speed  | 
 16MHz  | 
| 
 Chip Set  | 
 Intel  | 
| 
 Max. Onboard DRAM  | 
 2MB  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 AMI  | 
| 
 Dimensions  | 
 330.2mm x 218.4mm  | 
| 
 I/O Options  | 
 None  | 
| 
 NPU Options  | 
 80387SX  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Reset switch  | 
 CN1  | 
 Speaker  | 
 CN4  | 
| 
 Turbo switch  | 
 CN2  | 
 Power LED & keylock  | 
 CN7  | 
| 
 Turbo LED  | 
 CN3  | 
 External battery  | 
 CN8  | 
| 
 Note:CN2 can be connected to a turbo switch, however the manufacturer recommends that the computer be turned off before changing the CPU speed.  | |||
| 
 USER CONFIGURABLE SETTINGS  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| » | 
 CPU speed select fast  | 
 CN2  | 
 closed  | 
| 
 CPU speed select slow  | 
 CN2  | 
 open  | |
| » | 
 Battery select internal  | 
 CN9  | 
 pins 2 & 3 closed  | 
| 
 Battery select external  | 
 CN9  | 
 pins 1 & 2 closed  | |
| » | 
 Monitor type select monochrome  | 
 JP2  | 
 open  | 
| 
 Monitor type select color  | 
 JP2  | 
 closed  | |
| » | 
 BIOS type select 2764  | 
 JP4  | 
 pins 1 & 2 closed  | 
| 
 BIOS type select 27128  | 
 JP4  | 
 pins 2 & 3 closed  | |
| » | 
 Factory configured - do not alter  | 
 JP10  | 
 unknown  | 
| » | 
 Factory configured - do not alter  | 
 JP11  | 
 unknown  | 
| » | 
 Factory configured - do not alter  | 
 JP12  | 
 unknown  | 
| 
 DRAM CONFIGURATION  | |||||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 Bank 2  | 
 Bank 3  | 
 E1 - E8  | 
| 
 512KB  | 
 (18) 41256  | 
 NONE  | 
 NONE  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 512KB  | 
 NONE  | 
 NONE  | 
 (2) 256K x 9  | 
 NONE  | 
 pins 2 & 3 closed  | 
| 
 1MB  | 
 (18) 41256  | 
 (18) 41256  | 
 NONE  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 1MB  | 
 NONE  | 
 NONE  | 
 (2) 256K x 9  | 
 (2) 256K x 9  | 
 pins 2 & 3 closed  | 
| 
 1.5MB  | 
 (18) 41256  | 
 (18) 41256  | 
 (2) 256K x 9  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 2MB  | 
 (18) 41256  | 
 (18) 41256  | 
 (2) 256K x 9  | 
 (2) 256K x 9  | 
 pins 1 & 2 closed  | 
| 
 2MB  | 
 (18) 411000  | 
 NONE  | 
 NONE  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 2MB  | 
 NONE  | 
 NONE  | 
 (2) 1M x 9  | 
 NONE  | 
 pins 2 & 3 closed  | 
| 
 4MB  | 
 (18) 411000  | 
 (18) 411000  | 
 NONE  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 4MB  | 
 NONE  | 
 NONE  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
 pins 2 & 3 closed  | 
| 
 6MB  | 
 (18) 411000  | 
 (18) 411000  | 
 (2) 1M x 9  | 
 NONE  | 
 pins 1 & 2 closed  | 
| 
 8MB  | 
 (18) 411000  | 
 (18) 411000  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
 pins 1 & 2 closed  | 
| 
 DRAM MODE CONFIGURATION  | |||
| 
 Mode  | 
 DRAM type  | 
 JP8  | 
 JP9  | 
| 
 Page Mode (Four page)  | 
 100ns  | 
 pins 1 & 2 closed  | 
 pins 1 & 2 closed  | 
| 
 Page Mode (One page)  | 
 100ns  | 
 pins 2 & 3 closed  | 
 pins 1 & 2 closed  | 
| 
 Fast mode  | 
 100ns  | 
 pins 1 & 2 closed  | 
 pins 2 & 3 closed  | 
| 
 Slow mode  | 
 120ns  | 
 pins 2 & 3 closed  | 
 pins 2 & 3 closed  |