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2010-03-25 17:01

breeze
Account closed

Registered: Mar 2009
Posts: 20

Kick Assembler & SID Player

In previous work I used the built-in sid-player Kick Assembler and the SID wa play correctly. At least in the rumor was is not noticeable.

Working on new intro, I was encountered a problem with play the SID module. The module has play incorrect sounds with some distortions.

I tried to create an executable PRG-file using PSID64 and found that the sound is clear and correct.

So I formed the opinion that the embedded player in the Kick Assembler is slightly incorrect.

Maybe I am wrong and I do something wrong. But you can show me an example of another SID-player, and that I could test and solve own problem. Maybe somehow i can use the player from PSID64?

p.s. Many thanks in advance. Because of this trouble, we must postpone the our new release.

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2010-03-26 13:04

Skate

Registered: Jul 2003
Posts: 494

while we are talking on irqs, I just wrote an experimental code to see how irq fuckes up register values if we don't save them.

there is a little waiting time in the main loop between lda and sta. irq fucks up register values when waiting time block intersects with irq rasters. not a surprise, that's the expected result. but it also shows that if we always catch $d012 in our main loop and if we are sure main loop and irqs never conflict (rasterwise), then we wouldn't need to save a,x,y registers at all (no pha pla or sta lda stuff). of course main loop should never trust registers from the last frame. that's nothing unknown but I've never thought of getting rid of saving register values. I've always stored and restored register values even if main loop is just "jmp *". I just noticed it's not a must. maybe it can be useful in a very rare case in the future. :)

This information only applies while we are working in disabled kernal mode.

	!to "irqtest.prg",cbm

	* = $0801
	!byte $0c, $08, $00, $00, $9e, $32, $30, $36, $31, $00, $00, $00

	* = $080d
	sei
	lda #$35
	sta $01
	lda #$7f
	sta $dc0d
	sta $dd0d
	lda #$01
	sta $d01a
	lda #$80
	sta $d012
	lda #$1b
	sta $d011
	lda #<irq
	ldx #>irq
	sta $fffe
	stx $ffff
	asl $d019
	bit $dc0d
	bit $dd0d
	cli
-
	lda #$02
	ldx #$00
	dex
	bne *-1
	sta $d021
	jmp -

irq
;	sta toA
;	stx toX
;	sty toY
	inc $d020
	lda #$00 : pnt = *-1
	tax
	tay
	inc pnt
	asl $d019
;	lda #0 : toA = *-1
;	ldx #0 : toX = *-1
;	ldy #0 : toY = *-1
	rti

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