SEA LEVEL SYSTEMS, INC. ACB-III Card Type Serial card Chip Set Unidentified I/O Options Serial port Data Bus 8-bit ISA [Image] CONNECTIONS Function Label Serial port P1 USER CONFIGURABLE SETTINGS Function Label Position » Factory configured – do not alter E1 Unidentified » Factory configured – do not alter E7 Unidentified DMA tri state drivers permanently E9 Pins 1 & 3 closed enabled DMA tri state drivers enabled by E9 Pins 2 & 4 closed status control port bit 7 » Factory configured – do not alter E11 Unidentified » Factory configured – do not alter E12 Unidentified » Factory configured – do not alter E13 Unidentified » Factory configured – do not alter E14 Unidentified » Factory configured – do not alter SW2 Unidentified SERIAL PORT 1 SELECTION Setting E6 » Transmit clock output (TXC out) Pins 1 & 2 closed Transmit clock input (TXC in) Pins 3 & 4 closed Terminal timing source from SCC TRXC pin Pins 5 & 6 closed or input to TXC pin 24 on P1 Terminal timing source input to RXC pins Pins 7 & 8 closed is echoed to pin 24 on P1 Receive clock input Pins 11 & 12 closed SERIAL PORT 2 SELECTION Setting E3 » Transmit clock output (TXC out) Pins 1 & 2 closed Transmit clock input (TXC in) Pins 3 & 4 closed Terminal timing source from SCC TRXC pin Pins 5 & 6 closed or input to TXC pin 24 on P1 Terminal timing source input to RXC pins Pins 7 & 8 closed is echoed to pin 24 on P1 Receive clock input Pins 11 & 12 closed INPUT/OUTPUT CLOCK MODE SELECTION (PORT 1) Setting E10 Transmit clock output Pins 1 & 2 closed Transmit clock input Pins 3 & 4 closed Not used Pins 5 & 6 open Receive clock input Pins 7 & 8 closed INPUT/OUTPUT CLOCK MODE SELECTION (PORT 2) Setting E2 Transmit clock output Pins 1 & 2 closed Transmit clock input Pins 3 & 4 closed Not used Pins 5 & 6 open Receive clock input Pins 7 & 8 closed SERIAL PORT INTERRUPT SELECTION IRQ E8 2/9 Pins 1 & 2 closed 3 Pins 3 & 4 closed 4 Pins 5 & 6 closed » 5 Pins 7 & 8 closed Normal IRQ mode Pins 9 & 10 closed Multi IRQ mode Pins 11 & 12 closed BASE I/O ADDRESS SELECTION Setting SW1/1 SW1/2 SW1/3 SW1/4 SW1/5 SW1/6 SW1/7 » 238 Off On On On Off Off Off 280 Off On Off On On On On 2A0 Off On Off On Off On On 2E8 Off On Off Off Off On Off 300 Off Off On On On On On 328 Off Off On On Off On Off 3E8 Off Off Off Off Off On Off DMA CHANNEL SELECTION Channel E4 1 – two channel mode Pins 1 & 2 closed 3 – two channel mode Pins 1 & 2 closed Two channel A/B mode A3B1 Pins 3 & 4 closed Two channel A/B mode A1B3 Pins 5 & 6 closed Closed = channel A, Open = channel B Pins 7 & 8 3 – acknowledges channel 3 Pins 9 & 10 closed 1 – acknowledges channel 1 Pins 11 & 12 closed DMA SELECTION Setting E5 SCC channel A/B uses channel 3 Pins 1 & 2 closed SCC channel A uses channel 3 Pins 3 & 4 closed SCC channel A/B uses channel 1 Pins 5 & 6 closed SCC channel A uses channel 1 Pins 7 & 8 closed SCC channel B enabled for half duplex Pins 9 & 10 closed DMA transfers SCC channel A – DMA channel 1/3 for Pins 11 & 12 closed full duplex transfers