unit sio

Serial Input/Ouput interface library.

Set of useful constants, and structures to work with ATARI OS SIO procedures.
This library is a part of 'blibs' - set of custom Mad-Pascal libraries.
https://gitlab.com/bocianu/blibs

Constants:

name:	value:	description:
_R	$40	Read - predefined values for data transfer direction (to be set in DSTATS)
_W	$80	Write
_RW	$C0	Read and Write
_NO	$00	No data transfer
JSIOINT	$E459	SIO OS procedure vector

Types:

name:	type:	description:
DCB_struct	record DDEVIC : byte; // Device Id DUNIT : byte; // Unit number DCMND : byte; // Command DSTATS : byte; // Transfer direction on Input. Status on Output DBUFA : word; // Buffer address DTIMLO : byte; // Timeout in seconds DUNUSE : byte; // Unused DBYT : word; // Data length DAUX1 : byte; // Auxiliary bytes DAUX2 : byte; end;	Device Control Block structure definition

Register Variables:

name:	address:	type:	description:
DCB	$300	DCB_struct	Device Control Block variable
PACTL	$D302	byte	Port A Control Register
PBCTL	$D303	byte	Port A Control Register
VPRCED	$0202	word	Peripheral Proceed IRQ vector
VINTER	$0204	word	Peripheral interrupt IRQ vector
sioStatus	$303	byte	contains last SIO operation result, returned in DSTATS register. 1 is returned if operation was sucessfull, otherwise contains error code

Global Variables:

name:	type:	description:
sioResult	byte	contains last SIO operation result, returned in Y register. 1 is returned if operation was sucessfull, otherwise contains error code

Interface:

name:	description:
ExecSIO	procedure ExecSIO; assembler; Executes SIO operation defined by DCB block. On exit it returns status of operation in sioResult and/or sioStatus. 1 is returned if operation was sucessfull, otherwise variable contains error code.

name:

description:

ExecSIO

procedure ExecSIO; assembler;

Executes SIO operation defined by DCB block. On exit it returns status of operation in sioResult and/or sioStatus. 1 is returned if operation was sucessfull, otherwise variable contains error code.