Com1 (03f8h) rs-232, Default: irq4, Com2 (02f8h) rs-232 – Lynx EPM-4 User Manual
Page 22: Default: irq3, Com3 (03e8h) rs-422/485, Default: disabled, Com4 (02e8h) rs-422/485, Gp timer 0, gp timer 1, watchdog timer, Pci interrupt a, b, c, and d, Default: irq11