Realfun 3

The link works (at least for me), however as it is served over http, rather than httpS, recent versions have started to silently ignore such links due to mixed content when the source page _is_ served over httpS.

Or, as the console in Google Chrome puts it:

One workaround is to right click the link, copy the link, and then 'paste and go' the link directly in your address bar.

(Or, alternatively, xl2s could fix their certificate so a proper certificate is served, rather than one issued for 'localhost', so it could be linked over https)

Alright, I made a couple of changes to the interrupt handling and moved bits of code outside the interrupt and the music playback should be more steady now. It is a bit of compromise on the wave visualizers, but the music is more important.

Also for the fun of it added an cpu use indicator, which gives an idea about the work load on the r800. "Corridors of time" occasionally hits the 7/8, so 80% to 90% cpu load. With the old interrupt handler it was overloading every now and then, resulting in a unsteady tempo.

Furthermore I changed the SN i/o address base to 048h, so the SN76489 extension in openMSX can now be used (as well as franky?).

Finally I added a couple of very basic test tunes (single pattern loops) to the disk. I used these to try out some effects earlier... could be interesting.

Of course I expect to hear some new and proper compositions from you guys

The updated zip file can be downloaded with the same adress (www.xl2s.tk/realfun3trial.zip) or link

Sure, it is OK with me.

This is 49h !

To define the playsoniq port of its SN76489 at 049h:

	ld	a,01Eh		;
	out	(02Ah),a	; Add
	ld	a,049h		; Playsoniq
	out	(02Bh),a	; support

You can also use the MMM using this auto-detection routine:

EXPTBL:	equ	0FCC1h
ENASLT:	equ	00024h

	ld	H,080h
	call	MMM_Srch	; MMM detection
	cp	255
	jr	nz,No_MMM	; Jump if MMM is not found
	ld	a,080h
	out	(03Ch),a
	ld	a,040h
	ld	(0803Ch),a	; Enable the SN76489 port of MMM
No_MMM:
	ret

; Musical Memory Mapper detection

MMM_Srch:
	ld	l,0FFh
	ld	b,16

MMM_Srch_Loop:
	push	hl

	ld	a,b
	dec	a
	and	3

	ld	hl,EXPTBL
	add	a,l
	ld	l,a

	ld	a,b
	dec	a
	or	(hl)

	pop    hl

	jp	m,Sec_SLT	; Jump if secondary Slot

	and	0Fh
	cp	4
	jr	nc,NextMMM_Srch ; Jump if 3-3 Slot

Sec_SLT:
	ld	c,a

	push	bc
	push	hl
	call	ENASLT		; Slot to search
	pop	hl
	pop	bc

	di

	ld	a,080h
	out	(03Ch),a	; Enable acces to registers by memory address mode

	ld	a,(hl)
	and	%00011111
	inc	a

	out	(0FFh),a

	or	0C0h
	cp	(hl)		; Same value?

	ld	a,0
	out	(03Ch),a
	out	(0FFh),a	; Restore initial mapper page on bank 0C000H~0FFFFH 

	ei

	ld	a,c		; A = Found Slot Number (F000SSPP)
	jr	z,MMM_Found

NextMMM_Srch:
	djnz	MMM_Srch_Loop	; Jump if MMM is not found

	ld	a,0FFh		; MMM not found value
	ret

MMM_Found:
	dec	b
	ret

Auto-detection is only needed to change the value 49h to 3Fh, when an MMM is inserted. So your program can be compatible with the three cartridges using only one OUT (C),A.

Great job, now the SN chip works perfectly on my real Turbo R ST with the FlashJacks cartridge.

A small detail, when I access the music loader, the background image of the tracker is still active and the file browser is mixed with the tracker.

My computer is a Turbo R ST with internal 512k and a fat V9990 from Tecnobytes.

Thanks for this great job.