MAD EFFECT 1 and 2 do not work correctly

[Archange427]

MAD EFFECT 1 and 2 use a new way to get horizontal synchronization at each frame.
AIPC seems to have timing issues with that and the display is not synchronized.
So I built a special alternative version for AIPC (and previously for AppleWin) to compensate missing cycles (see comments in source code)

download and source code here:
http://fr3nch.t0uch.free.fr/MADEF/MADEF.html
http://fr3nch.t0uch.free.fr/MAD2/MAD2.html

Information from corrected issues that could be useful (from AppleWin's repository):
AppleWin/AppleWin#699
AppleWin/AppleWin#711
AppleWin/AppleWin#724
AppleWin/AppleWin#701

[sosaria7]

Hi, I fixed this problem.
Now, AIPC access memory at the last clock of each instructions.
and fixed some bugs of clock counting of 65c02 and interrupt occurring of 6522.

But there's some problem on MAD2.
To get the exact elapsed clock after interrupt, I needed to modify sub 26 to sub 25 in main.a
I tested on my real Apple IIe, and there's same problem.

        SEC                                                             ; 2
        LDA IntL                                                        ; 3
        SBC $C404           ; get T1 lower value (counter never stop)   ; 4 
                            ; -> read at cycle 18/24
                            ; reset INT too
        ; SEC not needed - never (previous result is always >0)                       
        ;SBC #26             ; = [32-7+1] => get final value from 0-7      ; 2
                            ; value = IntL - T1 lower + 7 - 24
        SBC #25             ; "fixed" value for AIPC / APPLEWIN         ; 2

[Archange427]

Hey @sosaria7
Very happy to see you back in the game!
And yes you're right, the right code is "SUB #25"!
At that time (MAD EFFECT 2), I was "groping" to get the code to work on AppleWin, AiPC and a real Apple II because none of them gave the same result... And some of my comments in my own code are probably wrong!

I've tested the other French Touch releases since then as well as unreleased tests and everything seems to work fine with this new version of AiPC (except for "Digidream" but this has nothing to do with a timing problem and I'll open a new issue for that soon).

Congratulations again for this update!

[tomcw]

@Archange427 - will you be updating the MAD2.DSK (here) with an image that works on the real IIe?

...I may have to revisit this in AppleWin now, as I admit I didn't test with a real IIe. Serves me right!

[tomcw]

Or just hex edit MAD2.DSK at offset $3318: 1A->19
It works on my non-enhanced IIe now :-)

EDIT: This fixed version also works on AppleWin! ...so AppleWin has a bug in that it runs MAD2.DSK with both values (1A and 19). Oh well, something else to fix :-/

[Archange427]

@tomcw : in fact, I plan to make available the sources of all French Touch releases on FT's Github "soon". That way, it will be much easier for updates them.
And on this occasion, I think the code of each release will be updated for the current versions of the emulators.

Btw thanks to @fenarinarsa for kicking my ass and "forcing" me to use some more modern stuff ;)

Edit: but "MAD2.DSK" available on http://fr3nch.t0uch.free.fr/MAD2/MAD2.html is working on a real IIe.
I just tested it... it's ok! So $3318: 1A is OK on my real IIe (PAL).

[tomcw]

No... MAD2.DSK does not work on a real IIe!
I only just tried it for the first time.

NB. I have a standard (non-enhanced) IIe, ie. with NMOS 6502.
What do you and @sosaria7 have?

[Archange427]

@tomcw :

sorry for the confusion but on my real IIe (PAL/unenhanced):

MAD2.DSK is working with SUB #25 OR SUB #26.
($3318: 19/1A)

Both also work on AppleWin.
But only the one with $19 (SUB #25) is working with AiPC.

[tomcw]

Hmm... but for me on my real IIe (PAL/unenhanced):
MAD2.DSK (SUB #26) - crashes!
MAD2.DSK (SUB #25) - working

[Archange427]

I don't know what to say.
I'm not in the habit of releasing stuff that doesn't work - at least - on my own machine.
So I tested it on mine at the time. I've done it again today and it works...

Would this have anything to do with the MegaAudio?

[tomcw]

Would this have anything to do with the MegaAudio?

Yes, maybe (probably?) as this emulates the 6522's using an FPGA - so maybe there's a subtle "out by 1" bug in their emulation?

[sosaria7]

I have NTSC/enhanced version of Apple //e
MAD2.DSK with SBC #26 doesn't work correctly on my Apple //e

[Archange427]

@sosaria7 : I updated MAD 2 DSK with SUB #25.
I think the "problem" (SUB #26 working) is related to the MegaAudio inside my own Apple IIe.
So you can close this issue.
Thanks again!