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progtool
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jazlib.arc
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JZSCROFF.C
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1986-05-06
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916b
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29 lines
#include <jaz.h>
/*
┌────────────────────────────────────────────────────────────────────────────┐
│jzscroff.c │
│Turn the display screen off. When turned back on the screen will be as it │
│was before. There is no need to save the data. │
│ │
│ (C) JazSoft Software by Jack A. Zucker (301) 794-5950 │
└────────────────────────────────────────────────────────────────────────────┘
*/
jzscroff()
{
#define CPORT 0x3D8 /* address of mode select register */
#define MPORT 0x3B8 /* address of CRT control port */
unsigned int PORTADDR; /* hold address of port */
unsigned int wport; /* hold original contents */
if (MEMB(0x40,0x49) == 7) /* mono card */
PORTADDR = MPORT;
else
PORTADDR = CPORT;
wport = inp(PORTADDR); /* get original contents */
outp(PORTADDR,wport & 0xF7); /* disable the display bit */
}