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diff --git a/16/tweak16/SCREEN.CPP b/16/tweak16/SCREEN.CPP
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+/*
+	Screen.CPP version 1.0
+	by Robert Schmidt of Ztiff Zox Softwear 1993
+
+	Defines some primitives for handling the screen, some screen
+		buffer pointers, and the functions that handle the single
+		temporary screen used in TWEAK.
+
+*/
+
+#include <conio.h>
+#include <mem.h>
+#include <dos.h>
+#include <iostream.h>
+#include <stdlib.h>
+#include "Screen.HPP"
+
+char palette16[16];
+char palette256[768];
+
+// editHeight and editWidth hold the dimensions of the editing screen.
+//	Not everything is formatted according to those horizontally, but
+//	vertically it should work fine.
+
+unsigned editMode, editHeight, editWidth, editSize;
+
+// Now for the screens used in TWEAK.
+
+// This one points to the standard VGA text screen buffer.  textscr[80]
+//	addresses the first character/attribute pair on the second line
+//	if the current mode is an 80-column one, for example.
+
+unsigned *textScr = (unsigned far *)MK_FP(0xb800,0);
+
+// graphScr points to the standard VGA graphics buffer, being 64Kb.
+
+char *graphScr = (char far *)MK_FP(0xa000,0);
+
+// setBiosMode() sets the given standard BIOS mode.
+
+void setBiosMode(int modeno)
+	{
+	_AX = modeno;
+	geninterrupt(0x10);
+	}
+
+// getBiosMode() returns the current BIOS mode.
+
+int getBiosMode(void)
+	{
+	_AH = 0x0f;
+	geninterrupt(0x10);
+	return _AL;
+	}
+
+// The following two functions saves and restores the temporary screen.
+//	The tempScr buffer is allocated and destroyed each time.
+
+void tempBuffer::save(void)
+	{
+	if (temp)
+		delete[] temp;
+	if (!(temp = new unsigned[editSize]))
+		{
+		cout << "Out of memory for swap screen!" << endl;
+		exit(1);
+		}
+	memcpy(temp, link, sizeof(unsigned)*editSize);
+	}
+
+void tempBuffer::restore(void)
+	{
+	setBiosMode(3);
+	textmode(editMode);
+	if (temp)
+		{
+		memcpy(link, temp, sizeof(unsigned)*editSize);
+		delete[] temp;
+		temp = NULL;
+		}
+	}
+
+void getPalette16()
+	{
+	for (int c=0; c<16; c++)
+		{
+		outp(0x3c0, 0x20 | c);
+		palette16[c] = inp(0x3c0);
+		}
+	}
+
+void setEgaPalette(char *p)
+	{
+	inp(0x3da);
+	for (int c=0; c<16; c++)
+		{
+		outp(0x3c0, c);
+		outp(0x3c0, p[c]);
+		}
+	outp(0x3c0, 0x20);
+	}
+
+void setPalette16()
+	{
+	char egaPal[] = {0,1,2,3,4,5,0x14,7,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f};
+	setEgaPalette(egaPal);
+	for (int c=0; c<16; c++)
+		{
+		outp(0x3c0, 0x20 | c);
+		outp(0x3c0, palette16[c]);
+		}
+	}
+
+void getPalette256()
+	{
+	outp(0x3c7, 0);
+	for (int c=0; c<768; c++)
+		palette256[c] = inp(0x3c9);
+	}
+
+void setPalette256()
+	{
+	char egaPal[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+	setEgaPalette(egaPal);
+	outp(0x3c8, 0);
+	for (int c=0; c<768; c++)
+		outp(0x3c9, palette256[c]);
+	}
+
+void preparePalettes()
+	{
+	int m=getBiosMode();
+	setBiosMode(0x13);
+	getPalette256();
+	setBiosMode(0x12);
+	getPalette16();
+	setBiosMode(m);
+	}
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