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1983-09-09
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/*
Osbourne Modem I/O Routines
These routines are the Osbourne
versions of the routines needed
to make TELNET work.
To make TELNET work with the Osb 1
make the obvious modifications to
telnet.c and recompile.
by: Dan Sunday
7473 Broken Staff
Columbia, MD 21044
(301)-730-6838
date: 4-23-82
Note: by suitably resetting the
io byte assignments in this
package, I and Dave Richardson
have successfully used the
modio.c routines to get TELNET
working on the TRS-80 Model 2
using Pickles & Trout
*/
#include "a:osbdscio.h"
/*
Routine to return true if input is present
at the modem port.
*/
miready()
{
char c;
char *iob,sviob;
iob = 3;
sviob = *iob; /* save io byte */
*iob = 1; /* console:= serial port */
c = bios(2); /* get console status */
*iob = sviob; /* restore io byte */
return c; /* return input status */
}
/*
Routine to return true if modem is ready
to output a byte.
*/
moready()
{
char c;
char *iob,sviob;
iob = 3;
sviob = *iob; /* save io byte */
*iob = 0x40; /* list device:= serial port */
c = bios(16); /* get list device status */
*iob = sviob; /* restore io byte */
return c; /* return output status */
}
/*
Get a byte from the modem:
*/
mgetch()
{
char c;
char *iob,sviob; /* I/O Byte */
unsigned n; /* time-out counter */
for (n=20000; !miready() && n; n--)
if (kbabort())
return ABORT; /* Abort Input */
if (!n) return TIMOUT; /* Read Time Out */
iob = 3;
sviob = *iob; /* save io byte */
*iob = 1; /* console:= serial port */
c = bios(3,0); /* get input char */
*iob = sviob; /* restore io byte */
return c; /* return input */
}
/*
Output a byte to the modem:
*/
mputch(c)
char c;
{
char *iob,sviob;
while (!moready())
if (kbabort())
return ABORT; /* Abort Output */
iob = 3;
sviob = *iob; /* save io byte */
*iob = 0x40; /* list:= serial port */
bios(5,c); /* output char */
*iob = sviob; /* restore io byte */
return OK; /* A-OK */
}
mputs(s)
char *s;
{
while (*s)
mputch(*s++);
}
/*-----------------------------------------*/
/*
Return true if keyboard hit and SPECIAL
typed:
*/
kbabort()
{
if (kbready() && getch() == SPECIAL)
return ABORT;
return OK;
}
kbready()
{
return bios(2);
}
/*
Get a character from the keyboard:
(Uses a direct BIOS instead of going through
the BDOS. By naming this the same as the library
version of "getchar", we insure that THIS version
is used by things like "gets" instead of the library
version.)
*/
getchar()
{
char c;
c = getch();
if (c == '\r') c = '\n';
putchar(c);
return c;
}
getch()
{
return bios(3);
}
/*
Write a character to the console.
*/
putchar(c)
char c;
{
if (c == '\n') putch2('\r');
putch2(c);
}
putch2(c)
char c;
{
bios(4,c);
}