TANDY/RADIO SHACK 250-4161/250-4161A Card type Hard drive controller Hard Drives supported Up to 7 SCSI devices Floppy drives supported None Data Bus 16-bit ISA Card Size Half-length, full-height card [Image] CONNECTIONS Function Location Function Location 50-pin SCSI connector - CN1 Drive active LED LED internal USER CONFIGURABLE SETTINGS Function Label Position » TERMPWR supplied from host adapter to F1 Closed SCSI interface TERMPWR not supplied to SCSI interface F1 Open » Synchronous Negotiation disabled J1/1 Open Synchronous Negotiation enabled J1/1 Closed » Factory configured - do not alter J1/2 Open » SCSI parity check enabled J1/3 Open SCSI parity check disabled J1/3 Closed » Zero wait states enabled J4 Open One wait state enabled J4 Closed » System computer is Tandy 4000 J5 Open System computer is Tandy 3000 J5 Closed DMA CHANNEL SELECTION Channel J1/7 J1/8 J6/1 J6/2 J6/3 0 Closed Closed Closed Open Open » 5 Open Closed Open Closed Open 6 Closed Open Open Open Closed 7 Open Open Open Open Open DMA CHANNEL SELECTION (CONTINUED) Channel J6/4 J7/1 J7/2 J7/3 J7/4 0 Open Closed Open Open Open » 5 Open Open Closed Open Open 6 Open Open Open Closed Open 7 Closed Open Open Open Closed INTERRUPT SELECTION Setting J1/9 J1/10 J1/11 J8/1 J8/2 9 Open Open Open Closed Open 10 Closed Open Open Open Closed » 11 Open Closed Open Open Open 13 Closed Closed Open Open Open 14 Open Open Closed Open Open 15 Closed Open Closed Open Open INTERRUPT SELECTION (CONTINUED) Setting J8/3 J8/4 J8/5 J8/6 9 Open Open Open Open 10 Open Open Open Open » 11 Closed Open Open Open 13 Open Closed Open Open 14 Open Open Closed Open 15 Open Open Open Closed BIOS ADDRESS SELECTION Address J10/1 J10/2 J10/3 C0000h Closed Closed Closed C4000h Closed Closed Open C8000h Closed Open Closed CC000h Closed Open Open D0000h Open Closed Closed D4000h Open Closed Open D8000h Open Open Closed » DC000h Open Open Open BASE I/O ADDRESS SELECTION Setting J9/1 J9/2 J9/3 J9/4 J9/5 J9/6 J9/7 J9/8 004h Closed Open Open Open Open Open Open Open 008h Open Closed Open Open Open Open Open Open 00Ch Closed Closed Open Open Open Open Open Open 010h Open Open Closed Open Open Open Open Open 014h Closed Open Closed Open Open Open Open Open » 330h Open Open Closed Closed Open Open Closed Closed 3F0h Open Open Closed Closed Closed Closed Closed Closed 3F4h Closed Open Open Open Open Open Closed Closed 3F8h Open Open Open Open Open Open Closed Closed 3FCh Open Closed Closed Closed Closed Closed Closed Closed 3FFh Closed Closed Closed Closed Closed Closed Closed Closed Note: The switches are a binary representation of the decimal memory addresses. SW1/8 is the Most Significant Bit and switch SW1/1 is the Least Significant Bit. The switches have the following decimal values: SW1/8=512, SW1/7=256, SW1/6=128, SW1/5=64, SW1/4=32, SW1/3=16, SW1/2=8, SW1/1=4. Add the values of the closed jumpers to obtain the correct memory address. (Closed=1, Open=0) ID SELECTION SCSI ID J1/4 J1/5 J1/6 0 Closed Closed Closed » 1 Open Closed Closed 2 Closed Open Closed 3 Open Open Closed 4 Closed Closed Open 5 Open Closed Open 6 Closed Open Open 7 Open Open Open TERMINATION SELECTION Setting RN6 RN7 » Termination enabled Installed Installed Termination disabled Removed Removed Note: Terminators should be removed if inline terminators are used or the host adapter is not at the end of the SCSI bus.