User`s manual

System Call Routines

5-2

String Formats for I/O

Within the context of the System Call handler there are two formats

for strings:

A line is defined as a string followed by a carriage return and a line

feed (<CR><LF>).

System Call Routines

The system call routines are described in this chapter, in order by

the 16-bit hex code. Table 5-1 list the routines in code order; Table

5-2 lists them in alphabetical order.

On entry to firmware system call routines, the machine state is

saved so that a subsequent abort or break condition allows you to

resume if you wish.

Pointer/Pointer Format The string is defined by a pointer to

the first character and a pointer to the

last character + 1.

Pointer/Count Format The string is defined by a pointer to a

count byte, which contains the count

of characters in the string, followed

by the string itself.

Table 5-1. System Call Routines -- Hex Code Order

Code Routine Description

$0000 .INCHR Input character

$0001 .INSTAT Input serial port status

$0002 .INLN Input line (pointer/pointer format)

$0003 .READSTR Input string (pointer/count format)

$0004 .READLN Input line (pointer/count format)

$0005 .CHKBRK Check for break

$0010 .DSKRD Disk read

$0011 .DSKWR Disk write