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iotrs80.cpp
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iotrs80.cpp
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#include <stdio.h>
#include <ctype.h>
#include "basic.h"
static unsigned short cursor;
static bool cursor_visable = FALSE;
static unsigned char* video_mem;
void IoTrsSetChar(unsigned short loc, unsigned char c)
{
video_mem[loc]=c;
WinDrawRange(video_mem, loc, loc);
}
unsigned char IoTrsPeek(unsigned short p1)
{
/** Video Ram? **/
if (p1>=0x3c00 && p1<=0x3fff)
return video_mem[p1-0x3c00];
else if (p1>=0x3801 && p1<=0x3880)
return WinTrsPeekKeyboard(p1);
else
return 0;
}
bool IoTrsSetReset(short x, short y, bool isset)
{
unsigned short loc = x/2+64*(y/3);
unsigned char cellx = x%2;
unsigned char celly = y%3;
if (loc>1023)
return FALSE;
if (!(video_mem[loc]&128))
video_mem[loc]= 128; /* set to a cleared graphics value */
if (isset)
video_mem[loc]|= (1<<(celly*2+cellx));
else
video_mem[loc]&= ~(1<<(celly*2+cellx));
WinDrawRange(video_mem, loc, loc);
return TRUE;
}
short IoTrsPoint(short x, short y)
{
unsigned short loc = x/2+64*(y/3);
unsigned char cellx = x%2;
unsigned char celly = y%3;
if (loc>1023)
return -1; /* -1 = TRUE, 0 = FALSE */
if (!(video_mem[loc]&128))
return 0; /* not a graphic cell, so false */
if (video_mem[loc]&(1<<(celly*2+cellx)))
return -1; /* -1 - TRS-80 TRUE */
else
return 0;
}
void IoTrsSetCursor(short i)
{
if (i <0) i =0;
else if (i > 1023) i=1023;
cursor = i;
}
short IoTrsGetCursor()
{
return cursor;
}
void IoTrsPutC(char cp)
{
unsigned char c = *((unsigned char*)&cp);
if (c==13 || c==10) // return
{
if (cursor_visable)
IoTrsSetChar(cursor,' ');
cursor = cursor/64;
cursor = cursor*64;
cursor = cursor + 64;
}
else if (c==8) // backspace
{
if (cursor > 0)
{
if (cursor_visable)
IoTrsSetChar(cursor,' ');
cursor--;
IoTrsSetChar(cursor,' ');
}
}
else if (c==0xE) // Turn on cursor
{
cursor_visable = TRUE;
}
else if (c==0xF) // Turn off cursor
{
IoTrsSetChar(cursor,' ');
cursor_visable = FALSE;
}
else if (c >=192) // 192 to 255 are tabs for 0 to 63 spaces, respectively
{
for (int i=0; i < (c-192); i++)
IoTrsPutC(' ');
}
else if (c==24) /* backspace cursor*/
{
if (cursor > 0)
cursor--;
}
else if (c==25) /* advance cursor*/
{
if (cursor < 1023)
cursor++;
}
else if (c==26) /* cursor down one line */
{
if (cursor <= 1023-64)
cursor+=64;
}
else if (c==27) /* acursor up one line */
{
if (cursor >= 64)
cursor-=64;
}
else if (c==28) /* home */
{
cursor=0;
}
else if (c==29) /* beginning of line */
{
cursor=(cursor/64)*64;
}
else if (c==30) /* erase to end of line */
{
for (int i=cursor; i < (cursor/64)*64+64; i++);
IoTrsSetChar(i, ' ');
}
else if (c==31) /* erase to end of frame */
{
for (int i=cursor; i < 1024; i++);
IoTrsSetChar(i, ' ');
}
else
{
IoTrsSetChar(cursor,c);
cursor++;
}
// Do we need to scroll?
if (cursor == 1024)
{
cursor = 1024 - 64;
for (int i=0; i < (1024 - 64); i++)
video_mem[i] = video_mem[i+64];
for (i=0; i < 64; i++)
video_mem[1024-i-1] = ' ';
WinDrawRange(video_mem, 0, 1023);
}
if (cursor_visable)
IoTrsSetChar(cursor, '_');
if (cursor >=1024)
{
cursor=0; // SHOULD NEVER HAPPEN
IoTrsPutC('E');IoTrsPutC('R');
}
}
//*************************************************
void IoTrsCls(void)
{
for (int i=0; i < 1024; i++)
video_mem[i]=' ';
cursor = 0;
cursor_visable = FALSE;
WinDrawRange(video_mem, 0, 1023);
}