HEDAKA
HED-988
| Processor | 80286 | 
| Processor Speed | 12/16/20MHz | 
| Chip Set | HEDAKA | 
| Max. Onboard DRAM | 4MB | 
| SRAM Cache | None | 
| BIOS | AMI | 
| Dimensions | 330.2mm x 218.4mm | 
| I/O Options | None | 
| NPU Options | 80287 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Speaker | CN1 | Turbo LED | CN5 | 
| Reset switch | CN2 | Turbo switch | JP4 | 
| Power LED & keylock | CN3 | External battery | JP5 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| » | NPU mode select synchronous with CPU | JP1 | pins 2 & 3 closed | 
| NPU mode select synchronous with oscillator installed at OSC1 | JP1 | pins 1 & 2 closed | |
| » | NPU speed select iOSC/3 | JP2 | pins 2 & 3 closed | 
| NPU speed select iOSC/1 | JP2 | pins 1 & 2 closed | |
| » | Monitor type select color | JP6 | pins 2 & 3 closed | 
| Monitor type select monochrome | JP6 | pins 1 & 2 closed | |
| » | CMOS memory normal operation | JP7 | open | 
| CMOS memory clear | JP7 | closed | |
| » | Parity check enabled | JP13 | open | 
| Parity check disabled | JP13 | closed | |
| Note:When JP7 is closed it also disables the password set in the CMOS | |||
| DRAM CONFIGURATION | ||||||
| Size | Bank 0(DIP) | P-0 | Bank 1 (DIP) | P-1 | Bank 0 (SIPP) | Bank 1 (SIPP) | 
| 512KB | (4) 44256 | (2) 41256 | NONE | NONE | NONE | NONE | 
| 512KB | NONE | NONE | NONE | NONE | (2) 256K x 9 | NONE | 
| 1MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | NONE | NONE | 
| 1MB | NONE | NONE | NONE | NONE | (2) 256K x 9 | (2) 256K x 9 | 
| 1.5MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | (2) 256K x 9 | NONE | 
| 2MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | NONE | NONE | 
| 2MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | NONE | 
| 4MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | 
| DRAM JUMPER CONFIGURATION | |||||
| Size | Jumper JP8 | Jumper JP9 | Jumper JP10 | Jumper JP11 | Jumper JP12 | 
| 512KB | open | closed | closed | closed | closed | 
| 1MB | closed | open | closed | closed | closed | 
| 1.5MB | open | open | closed | closed | closed | 
| 2MB | closed | closed | open | closed | closed | 
| 2MB1 | closed | closed | open | closed | open | 
| 4MB | open | closed | open | closed | open | 
| Note1 :Setting represents (2) 1M x 9 SIPPs installed. | |||||