ADVANCED MICROCOMPUTER SYSTEMS, INC. 422/485PC-40/DB25 Card Type Serial card Chip Set Unidentified Maximum Onboard Memory N/A I/O Options Serial ports (4) Data Bus 16-bit ISA Floppy drives supported N/A [Image] CONNECTIONS Function Label Function Label 37-pin serial port CN1 38-pin serial port CN2 connector interface SERIAL PORT 1 ADDRESS CONFIGURATION Setting J7/A » COM1 (3F8h) Closed Disabled Open SERIAL PORT 2 ADDRESS CONFIGURATION Setting J7/B » COM2 (2F8h) Closed Disabled Open SERIAL PORT 3 ADDRESS CONFIGURATION Setting J7/C » COM3 (3E8h) Closed Disabled Open SERIAL PORT 4 ADDRESS CONFIGURATION Setting J7/D » COM4 (2E8h) Closed Disabled Open SERIAL PORT 1 INTERRUPT SELECTION IRQ SP1/A SP1/B SP1/C SP1/D SP1/E SP1/F 2/9 Closed Open Open Open Open Open 3 Open Closed Open Open Open Open » 4 Open Open Closed Open Open Open 5 Open Open Open Closed Open Open 6 Open Open Open Open Closed Open 7 Open Open Open Open Open Closed 10 Open Open Open Open Open Open 11 Open Open Open Open Open Open 12 Open Open Open Open Open Open 14 Open Open Open Open Open Open 15 Open Open Open Open Open Open SERIAL PORT 1 INTERRUPT SELECTION (CON’T) IRQ SP1/G SP1/H SP1/I SP1/J SP1/K 2/9 Open Open Open Open Open 3 Open Open Open Open Open » 4 Open Open Open Open Open 5 Open Open Open Open Open 6 Open Open Open Open Open 7 Open Open Open Open Open 10 Closed Open Open Open Open 11 Open Closed Open Open Open 12 Open Open Closed Open Open 14 Open Open Open Closed Open 15 Open Open Open Open Closed SERIAL PORT 2 INTERRUPT SELECTION IRQ SP2/A SP2/B SP2/C SP2/D SP2/E SP2/F 2/9 Closed Open Open Open Open Open » 3 Open Closed Open Open Open Open 4 Open Open Closed Open Open Open 5 Open Open Open Closed Open Open 6 Open Open Open Open Closed Open 7 Open Open Open Open Open Closed 10 Open Open Open Open Open Open 11 Open Open Open Open Open Open 12 Open Open Open Open Open Open 14 Open Open Open Open Open Open 15 Open Open Open Open Open Open SERIAL PORT 2 INTERRUPT SELECTION (CON’T) IRQ SP2/G SP2/H SP2/I SP2/J SP2/K 2/9 Open Open Open Open Open » 3 Open Open Open Open Open 4 Open Open Open Open Open 5 Open Open Open Open Open 6 Open Open Open Open Open 7 Open Open Open Open Open 10 Closed Open Open Open Open 11 Open Closed Open Open Open 12 Open Open Closed Open Open 14 Open Open Open Closed Open 15 Open Open Open Open Closed SERIAL PORT 3 INTERRUPT SELECTION IRQ SP3/A SP3/B SP3/C SP3/D SP3/E SP3/F 2/9 Closed Open Open Open Open Open 3 Open Closed Open Open Open Open 4 Open Open Closed Open Open Open » 5 Open Open Open Closed Open Open 6 Open Open Open Open Closed Open 7 Open Open Open Open Open Closed 10 Open Open Open Open Open Open 11 Open Open Open Open Open Open 12 Open Open Open Open Open Open 14 Open Open Open Open Open Open 15 Open Open Open Open Open Open SERIAL PORT 3 INTERRUPT SELECTION (CON’T) IRQ SP3/G SP3/H SP3/I SP3/J SP3/K 2/9 Open Open Open Open Open 3 Open Open Open Open Open 4 Open Open Open Open Open » 5 Open Open Open Open Open 6 Open Open Open Open Open 7 Open Open Open Open Open 10 Closed Open Open Open Open 11 Open Closed Open Open Open 12 Open Open Closed Open Open 14 Open Open Open Closed Open 15 Open Open Open Open Closed SERIAL PORT 4 INTERRUPT SELECTION IRQ SP4/A SP4/B SP4/C SP4/D SP4/E SP4/F 2/9 Closed Open Open Open Open Open 3 Open Closed Open Open Open Open 4 Open Open Closed Open Open Open 5 Open Open Open Closed Open Open 6 Open Open Open Open Closed Open 7 Open Open Open Open Open Closed » 10 Open Open Open Open Open Open 11 Open Open Open Open Open Open 12 Open Open Open Open Open Open 14 Open Open Open Open Open Open 15 Open Open Open Open Open Open SERIAL PORT 4 INTERRUPT SELECTION (CON’T) IRQ SP4/G SP4/H SP4/I SP4/J SP4/K 2/9 Open Open Open Open Open 3 Open Open Open Open Open 4 Open Open Open Open Open 5 Open Open Open Open Open 6 Open Open Open Open Open 7 Open Open Open Open Open » 10 Closed Open Open Open Open 11 Open Closed Open Open Open 12 Open Open Closed Open Open 14 Open Open Open Closed Open 15 Open Open Open Open Closed MISCELLANEOUS TECHNICAL NOTE Note: CN1 is a DB-37 connector which has two DB-25 (port 1 & 2) serial ports connected. CN2 is a 38-pin interface which can be connected to an external DB-37 which splits into two DB-25 serial ports (port 3 & 4) .