Ascii Control Codes; Ascii Control Codes; Extended Function Calls - NEC CP/M-86 System Reference Manual

Advanced BIOS Functions
ASCII CONTROL CODES
Table 6-1 summarizes the ASCII control codes which are available for the
CONOUT routine in the BIOS.
Table 6-1 ASCII Control Codes
CONTROL HEX
CHARACTER
CODE ACTION TAKEN
BEL
07H Sound bell tone
BS 08H Cursor backward
LF OAH
Cursor down
VT OBH
Cursor up
FF
OCH Cursor forward
CR ODH Cursor to left margin
SUB lAH Erase screen
ESC IBH Introduce an escape sequence
RS
lEH Cursor home
~
EXTENDED FUNCTION CALLS
Entry to the extended BIOS is accomplished through the 8086 software interrupt
#220. The extended function code is passed in register CL. Registers DX, DS, and
AX contain additional parameters as necessary. The status of the GRAPH1,
GRAPH2, CAPS, and AL T keys are returned in register AH for direct CBIOS calls.
All registers are automatically saved upon entry and restored upon exit from the
CBIOS. Table 6-2 lists the extended function calls.
6-9