Specifications

viii
FIGURES AND TABLES
FIGURES
Figure 1-1 Mechanical Dimensions.......................................................................................... 1-5
Figure 2-1 Connector and Jumper Locations ........................................................................... 2-2
Figure 2-2 Byte-Wide Socket Jumpering................................................................................. 2-9
Figure 4-1 Little Board/286 Block Diagram ............................................................................ 4-2
TABLES
Table 2-1 Summary of Connector Usage................................................................................ 2-1
Table 2-2 Configuration Jumper Summary............................................................................. 2-3
Table 2-3 "Soft" Configuration Options ................................................................................. 2-4
Table 2-4 Power Connector (J1) ............................................................................................. 2-5
Table 2-5 Onboard DRAM Memory Size Jumpering............................................................. 2-7
Table 2-6 Byte-Wide Device Compatibility ........................................................................... 2-8
Table 2-7 U32 and U33 Device Jumpering............................................................................. 2-9
Table 2-8 Video Mode Jumper (W22).................................................................................... 2-10
Table 2-9 Utility Connector (J4)............................................................................................. 2-12
Table 2-10 Keyboard Connector (J5)........................................................................................ 2-14
Table 2-11 Parallel Printer Connector (J6) ............................................................................... 2-15
Table 2-12 Parallel Printer Port Configuration......................................................................... 2-15
Table 2-13 Serial Port Connectors (J2,J3) ................................................................................ 2-17
Table 2-14 Supported Floppy Formats ..................................................................................... 2-17
Table 2-15 Dual-Speed Drive Option ....................................................................................... 2-18
Table 2-16 Floppy Disk Interface Connector (J8) .................................................................... 2-19
Table 2-17 SCSI Interface Connector (J7)................................................................................ 2-20
Table 2-18A AT Expansion Bus Connector, A1-A32 (J9).......................................................... 2-27
Table 2-18B AT Expansion Bus Connector, B1-B32 (J9) .......................................................... 2-28
Table 2-18C AT Expansion Bus Connector, C0-C19 (J10) ........................................................ 2-29
Table 2-18D AT Expansion Bus Connector, D0-D19 (J10)........................................................ 2-29
Table 2-19 Interrupt Channel Assignment................................................................................ 2-30
Table 2-20 DMA Channel Assignment..................................................................................... 2-30
Table 4-1 Little Board/286 Memory Map............................................................................... 4-4
Table 4-2 Little Board/286 I/O Map....................................................................................... 4-5
Table 4-3 Interrupt Channel Assignment................................................................................ 4-8
Table 4-4 DMA Channel Assignment..................................................................................... 4-8
Table 4-5 Timer Assignment .................................................................................................. 4-10
Table 4-6 Parallel Port Register Bits....................................................................................... 4-15