Octagon PC-510, Руководство пользователя

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11-10
EZ I/O PC-510 user’s manual
Return registers: Carry flag cleared if successful
Carry flag set if error
AL Error code
Comments: This function is used to initialize the second EZ I/O
(i.e., the EZ I/O that has the lower I/O address
when two EZ I/O chips are present on a board)
before normal use.
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
asm {
mov ax,0ef03h
mov di,00ffh /*port A all outputs, init data=all 0’s */
mov bx,55ffh /*port B all outputs, init data=55h*/
mov cx,0000h /*port C all inputs*
mov dx,0ffffh
int 17h
}
Write EZ I/O 2
Function: efh
Subfunction: 04h
Purpose: To write a value to an EZ I/O port.
Calling registers:
AH efh
AL 04h
DI Port A mask and data
xxxxxxxx xxxxxxxxB
xxxxxxxx Mask for port A; 1->bit to be changed
xxxxxxxxB Data for port A
BX Port B mask and data
xxxxxxxx xxxxxxxxB
xxxxxxxx Mask for port B; 1->bit to be changed
xxxxxxxxB Data for port B
CX Port C mask and data
xxxxxxxx xxxxxxxxB
xxxxxxxx Mask for port C; 1->bit to be changed
xxxxxxxxB Data for port C
DX ffffh
Return registers: Carry flag cleared if successful
Carry flag set if error
AL Error code
Comments: This function is used to write to the second EZ I/O
(i.e., the EZ I/O that has the lower I/O address
when two EZ I/O chips are present on a board).
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
asm {