MEM 0040h:0000h - BASE I/O ADDRESS OF FIRST SERIAL I/O PORTIBM PC Portable (uses same BIOS as XT) Size: WORD Notes: the BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. sets this word to zero if is unable to find any serial ports at the addresses it is programmed to check at boot DOS and BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. serial device numbers may be redefined by re-assigning these values of the base I/O addresses stored here Under DR-OpenDOS 7.02+ this setting can be changed with the undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. CONFIG.SYS COM1=[port_address|logical_no][,[timeout]] directive, whereby port_address = 200h..3F8h, logical_no = 0 or 1..4, timeout=0..255 (default 1). SeeAlso: MEM 0040h:0002h,MEM 0040h:0004h,MEM 0040h:0006h,MEM 0040h:0008h SeeAlso: MEM 0040h:007Ch,INT 14/AH=00h,PORTIBM PC Portable (uses same BIOS as XT) 03F8h"SERIAL"