Sa-1 IRQ oddity (SMW modding)

Bio · Post by **Bio** » Thu Mar 06, 2008 6:55 am

I started implenting SA-1 into SMW(mostly because superFX gave me too much trouble). However, when SA-1 is active and the V-counter IRQ is enabled, the SNES randomly get IRQ signal, causing chaotic slowdown and layer 3 displacement(Since SMW use IRQ to make layer 3 at the correct location). Here the code used by both SA-1 and the SNES:

Code: Select all

Define:
!CIE  = $220A  ;ITDNxxxx
;I: Receive SNES' IRQ T:Timer IRQ enable D: DMA IRQ enable N: Receive SNES NMI
!CIC  = $220B  ;ITDNxxxx
;I: Clear IRQ T: Clear Timer IRQ D: Clear DMA IRQ N:Clear NMI
!SNV  = $220C  ;Alternate NMI vector from then SNES
!SNV2 = $220D
!SIV  = $220E  ;Alternate IRQ vector
!SIV2 = $220F
!TMC  = $2210  ;SxxxxxVH
;S: 0:HV timer 1:linear timer V:enable V timer H: enable H timer
!CTR  = $2211  ;Writing here reset timer to 0
!HCNT = $2212
!VCNT = $2214
!VCNT2 = $2215
!CXB  = $2220
!DXB  = $2221
!EXB  = $2222
!FXB  = $2223
!BMAPS = $2224
!BMAP = $2225
!SBWE = $2226
!CBWE = $2227
!BWPA = $2228
!SIWP = $2229
!CIWP = $222A
!DCNT = $2230
!CDMA = $2231
!SDA  = $2232
!DDA  = $2235
!DTC  = $2238
!BBF  = $223F
!BRF  = $2240
!MCNT = $2250
!MA   = $2251
!MB   = $2253
!VBD  = $2258
!VDA  = $2259
!SFR  = $2300
!CFR  = $2301
!HCR  = $2302
!VCR  = $2304
!MR   = $2306
!OF   = $230B
!VDP  = $230C
!VC   = $230E



		    lda #$A0
		    stz !SIE
		    sta !SIC
		    stz !BWPA
		    stz !BMAPS
		    lda #$FF
		    sta !SIWP
		    stz !CXB
		    lda #$01
		    sta !DXB
		    inc a
		    sta !EXB
		    inc a
		    sta !FXB
		    rep #$20
		    lda #SA_1NMI
		    sta !CNV
		    lda #SA_1NMI
		    sta !CIV
		    lda #SA_1_Start      
		    sta !CRV
		    sep #$20
		    lda #$FF
		    sta !SIWP
		    stz !CCNT


SA-1Code:

SA_1NMI:

                              rti

SA_1_Start:

          clc
		    xce
		    sep #$20
		    lda #$f0
		    stz !CIE
		    stz !TMC
		    stz !DCNT
		    stz !SCNT
		    sta !CIC
		    stz !BMAP
		    lda #$00
		    sta !CBWE
		    lda #$FF
		    sta !CIWP
		    rep #$30
		    ldx #$37FF
		    txs
		    PHK
		    PLB
		    bra $FE

Y~K · Post by **Y~K** » Thu Mar 06, 2008 5:18 pm

Any idea why people call it SA-1 instead of SA1 as in the chip & PCB printing?

http://upload.wikimedia.org/wikipedia/c ... SA1_01.jpg

Bio · Post by **Bio** » Thu Mar 06, 2008 10:36 pm

Y~K wrote:Any idea why people call it SA-1 instead of SA1 as in the chip & PCB printing?

http://upload.wikimedia.org/wikipedia/c ... SA1_01.jpg

Because the SNES dev manual refer to it as SA-1

Y~K · Post by **Y~K** » Thu Mar 13, 2008 9:25 am

Bio wrote:
Y~K wrote:Any idea why people call it SA-1 instead of SA1 as in the chip & PCB printing?

http://upload.wikimedia.org/wikipedia/c ... SA1_01.jpg
Because the SNES dev manual refer to it as SA-1

link?

creaothceann · Post by **creaothceann** » Thu Mar 13, 2008 1:37 pm

Might've been this one.

Y~K · Post by **Y~K** » Sat Mar 15, 2008 11:08 pm

Japanese official docs please.

Post by **pagefault** » Sun Mar 16, 2008 1:22 am

Y~K wrote:Japanese official docs please.

Weeaboo.

whicker · Post by **whicker** » Sun Mar 16, 2008 6:23 am

just everyone call it "Super Accelerator One" if you want to be pedantic. Even if there was never a two.

sweener2001 · Post by **sweener2001** » Mon Mar 17, 2008 10:21 am

http://pbfcomics.com/?cid=PBF071-Weeaboo.gif

because it's hilarious. and demanding japanese documents is ridiculous, given what was linked.

Y~K · Post by **Y~K** » Tue Mar 18, 2008 7:02 pm

How is it ridiculous given the chip was developed and manufactured in Japan.
The japanese docs ought to be more accurate.

sweener2001 · Post by **sweener2001** » Tue Mar 18, 2008 9:23 pm

i'm pretty confident that the documents made the transition to english without any problems. it's not like there's going to be a kaeru issue there. and does it really matter why a hyphen was added?

one would guess readability, something that isn't really needed so much on the chip itself.

declan · Post by **declan** » Sun Mar 23, 2008 8:23 am

What would be the point in implementin SA-1, MARIO CHIP, Super FX GSU-1, Super FX GSU-2, Super FX GSU-2 SP-1 or any other enhancement chip for SMW????????????

I thought this game works fine as is

franpa · Post by **franpa** » Sun Mar 23, 2008 8:38 am

maybe he wants to make his own game and needs that special chip!

declan · Post by **declan** » Sun Mar 23, 2008 10:14 am

franpa wrote:maybe he wants to make his own game and needs that special chip!

Oh.... i didn't think of that.
(keeps quiet)

declan · Post by **declan** » Mon Mar 24, 2008 6:08 am

(not quiet anymore)
I actually don't know much at all (if anything) about programming for the snes.
But just out of curiosity; Bio, what language is that code ,you've provided, in?

EDIT:
Is it assembly? doesn't look familiar, but i have heard (maybe i heard incorrectly) the snes is programmed in assembly

Post by **grinvader** » Mon Mar 24, 2008 11:23 am

... It's sa-1 assembly. Which is also 5a22 assembly.

... programming in assembly is pretty much a must considering there aren't any complete C compilers for these platforms.

Bio · Post by **Bio** » Tue Mar 25, 2008 4:58 pm

declan wrote:What would be the point in implementin SA-1, MARIO CHIP, Super FX GSU-1, Super FX GSU-2, Super FX GSU-2 SP-1 or any other enhancement chip for SMW????????????

I thought this game works fine as is

the original game, not any of his mods. The main issue is that tools just keep stacking new code on it(some of wich are really ineficient). as a result, the game can very easly become laggy when you add too much stuff. I also got some nice effect added with them, such as real-time modification of Mario graphic and creation of HDMA table that get updated when the screen scroll up or down

declan · Post by **declan** » Tue Mar 25, 2008 11:39 pm

Sound's impressive Bio

EDIT:
The SA-1 would be good for what your donig right? 'cause you're not doing anything out of the ordinary (like polygons or somthing), just more of the same "snes stuff", like Donkey Kong (even though it doesn't use the SA-1).
Unless you were trying to make it more like Yoshi's Island, with the sprite stetching, rotating and those mad paralax layers. In which case the Super FX would come in handy right?

creaothceann · Post by **creaothceann** » Wed Mar 26, 2008 12:36 am

declan wrote:those mad paralax layers

?

declan · Post by **declan** » Wed Mar 26, 2008 3:46 am

creaothceann wrote:
declan wrote: those mad paralax layers

?

I'm talking the paralax layers used in Yoshi's Island. and some point there's like four layers, some with animation. Not just still paralax layers, like in Donkey Kong Country

creaothceann · Post by **creaothceann** » Wed Mar 26, 2008 11:05 am

At what point in the game?

(For 4 layers they'd have to use sprites to simulate a background, or use BG mode 0.)

declan · Post by **declan** » Thu Mar 27, 2008 2:55 am

I recon at some points in monkey world there'd be four layers, though maybe your right, probly only 1 or 2 have animation (and of coase, if there's animation, there's spites), the rest are just stills i supose.
Though, in Donkey Country 2: Diddy's Kong Quest, I think its in "Web Woods", world 5, level 5, i spotted i think about 5 layers, though none of them had animation.

Bio · Post by **Bio** » Sun Mar 30, 2008 1:59 am

what animation has to do with all this? the HDMA effect for pseudo multi-layer don't becom harder to do if you add animation.

I already implented said effect with SuperFX(see it here:http://www.youtube.com/watch?v=GKUfY16V7IU)

Can we get back on the main topic? I really to know why timer IRQ get mad if SA-1 is active

Post by **grinvader** » Sun Mar 30, 2008 11:15 am

You do know that the SA-1 has its own irqs, right ?

doktor_kris · Post by **doktor_kris** » Sun Mar 30, 2008 9:43 pm

A splendid piece of work, there! :-)