cbmeeks cbmeeks

Replace Default IRQ Handler

We are used to inserting small routines at the beginning of the default interrupt handler as an IRQ wedge. This has an advantage of being easy and not requiring any modifications to the part of memory occupied by the ROM.

But the default handler is responsible for cursor blinking, handling the screen editor and few other things. As we don't usually need them in our sprite animation, the default handler's code is just a waste of cycles and memory for us.

We have a simple routine wedged into the interrupt handler. It changes the border and the background color, executes a hundred nops and changes the colors back.

This allows us to see how much raster time it takes to run this routine.

	Yacht
	(Yet Another Cycle Hunting Table)


	-------------------------------------------------------------------------------
	Forewords :
	-------------------------------------------------------------------------------
	This document is based on :
	- 9th Edition of M68000 8-16-32-bit Microporcessor User's Manual
	(Motorola, 1993) (laterly refered as M68000UM)

	; v0.2.2
	;
	; Bill O'Neill - Last update: 2011/11/11
	;
	; Monitor code is Open License and can be used freely
	; Tiny Basic code is Copyright, Tom Pitman
	;
	; Consist of a minimal terminal monitor and Tom
	; Pitman's Tiny Basic as a high-level
	; programming language

	;************************************************************************************
	;************************************************************************************
	; This file was included in the Project 64 Repository after all efforts to contact
	; Lee Davison, the original author, were proven unsuccessful. The inclusion is meant
	; to honour his sterling work on providing us with the very best document on every
	; bit of the Commodore 64's firmware content. We want this to remain available to
	; the public and allow other members to benefit from Lee's original, excellent job.
	;************************************************************************************
	; $VER:C64LD11.S, included on 2014-11-12
	;************************************************************************************

	; https://www.folklore.org/html/BootBeep.html

	; Boot beep routine
	;
	; Called with RTS6 A3 must be set up w/ memory offset (overlay)
	; D3 contains the duration: 40 is boot beep

	; make an attractive beep to tell the world that the CPU works. Use
	; Charlie Kellner's filter algorithm. First fill the waveForm buffer
	; with the initial waveForm.

	8 REM MINNESOTA EDUCATIONAL COMPUTING CONSORTIUM STAFF
	9 REM PROGRAMMING REVISIONS BY DON RAWITSCH - 1975
	11 REM CURRENT VERSION - 3/27/75
	15 REM FOR THE MEANING OF THE VARIABLES USED, LIST LINES 4900-4960
	25 PRINT "DO YOU NEED INSTRUCTIONS (YES/NO)";
	30 DIM C$[5]
	35 INPUT C$
	40 IF C$="NO" THEN 400
	45 PRINT LIN(2)
	59 REM *INSTRUCTIONS*


	SELECT
	sc.name, p.name, st.last_execution_time
	FROM sys.procedures AS p
	INNER JOIN sys.schemas AS sc ON p.[schema_id] = sc.[schema_id]
	LEFT OUTER JOIN sys.dm_exec_procedure_stats AS st ON p.[object_id] = st.[object_id]
	ORDER BY
	p.name, st.last_execution_time DESC


	===========================
	SID FILE FORMAT DESCRIPTION
	===========================

	AUTHORS:
	Michael Schwendt (PSID v1 and v2)
	Simon White (PSID v2NG, RSID)
	Dag Lem (PSID v2NG)
	Wilfred Bos (PSID v3, RSID v3, PSID v4, RSID v4)

	;-------------------------------------------------------------------------
	;
	; The WOZ Monitor for the Apple 1
	; Written by Steve Wozniak 1976
	;
	; Converted to assemble with ca65 by cbmeeks
	;
	; Original code with comments taken from
	; http://www.sbprojects.com/projects/apple1/wozmon.php
	;

	: HELLO-WORLD ." Hello world!" ;
	HELLO-WORLD