CEF32

VDM1 Screen


This is a S-100 VDM-1 video and screen emulator.  Two  fonts are supplied for this component named 6574.c and  6575.c. 

Startup commands:



	
	
	

		
			
Command

				
		
			
Description

				
	

	

		
			
CLEAR

				
		
			
Initializes display memory to spaces.

				
	

	

		
			
CONTROL

				
		
			
Display controls.  This is the default.

				
	

	

		
			
CURSOR x

				
		
			
Sets the cursor mode to "x", where "x" is one of the following:
NONE = No cursor
BLINK = Blinking cursor
SOLID = Solid cursor

				
	

	

		
			
FONT x

				
		
			
use character set "x", where "x" is 6574 (the default) or 6575.

				
	

	

		
			
INVERT

				
		
			
Sets the screen to inverted video.  The default is normal video.

				
	

	

		
			
NOPARALLEL

				
		
			
The screen is updated sychronously with the rest of the program.

				
	

	

		
			
PARALLEL

				
		
			
The screen is managed in a separate thread (default).

				
	

	

		
			
PORT n

				
		
			
Sets the current port to address n (default is C8 hex).

				
	

	

		
			
NOCONTROL

				
		
			
Don't display controls.  The default is to display controls.

				
	

	

		
			
NORMAL

				
		
			
Sets the screen to normal video.

				
	

	

		
			
START n

				
		
			
Sets the lowest memory address mapped to the screen.  The value is assumed to be hexadecimal unless it is terminated with a period (.) - indicating a decimal value.

				
	

	

		
			
TEST

				
		
			
Fills the screen with a test pattern.

				
	

	

		
			
TTILE x

				
		
			
Sets the screen window caption to "x".

				
	

	

		
			
TOP n

				
		
			
Sets the top line counter to n.