how can i activate snes enhancement chips - ASM & Related Topics

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how can i activate snes enhancement chips

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oderjunks
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Posted on 2020-08-09 07:22:52 PM | Last edited 2020-08-09 07:32:49 PM by oderjunks

Code
Why do you PRINT SMWC THREADS?!?!?!? anyway
----------------------------

the code works but bizhawk thinks the chip doesn't exist.
uberasm file:

Code

main:
  lda $002800
  and #$0F
  sta $7E1DEF

in bizhawk i looked at ram addr 7e1def and found that it stayed at 00.
how do i activate the chip emulation? the one i'm using is s-rtc chip, but ideally i want to enable any chip made for the snes at all
i know snes9x supports srtc so i'm gonna check that.
it's 10:20 pm and i just can't anymore, i'll probably be back tomorrow

edit: i don't know how, but it bizhawk and snes9x store null in that addr, if i change it to 7e0019 [ mario powerup state ] for example, it crashes.

edit 2: i changed the addr to 7E0DBF [ coin counter ] and its not crashing anymore, am i losing my mind?

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Thomas
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Posted on 2020-08-09 11:21:09 PM | Last edited 2020-08-10 02:50:12 PM by Thomas

Well, unless you have an RTL after that code, of course it's gonna crash. You need to return the code or else it's just gonna keep going into garbage.

Anyway, to activate chip emulation, you have to mess with the ROM's header. That's where emulators get information about the expansion chips installed on the current ROM; specifically, they get it from a single byte at $00FFBF. See the chipset info on fullsnes for more information, for S-RTC in particular you probably want $55.

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oderjunks
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Posted on 2020-08-10 08:13:11 AM | Last edited 2020-08-10 12:35:34 PM by oderjunks

Code
Why do you PRINT SMWC THREADS?!?!?!? anyway
----------------------------

Originally posted by Thomas

Well, unless you have an RTL after that code, of course it's gonna crash. You need to return the code or else it's just gonna keep going into garbage.

$#smw{-_-2}$

Originally posted by Thomas

Anyway, to activate chip emulation, you have to mess with the ROM's header. That's where emulators get information about the expansion chips installed on the current ROM; specifically, they get it from a single byte at $00FFBF. See the chipset info on fullsnes for more information, for S-RTC in particular you probably want $55.

Oh! i'll check that out...

Ok i'm back and found 55h to be the one

55h ROM+S-RTC+RAM+Battery

aand i just noticed you already said that.

Thank you so so much for the help!

EDIT:
Ok it's... uhhhhhhhh..... doing something?
i have not a single clue what is going on send help
Asar patch:

Code

assert read1($00FFD6) == 55, "Patch has already been used!"
org $00FFD6
  db $55

UBERasm patch:

Code

main:
  LDA $2800
  STA $7E1DEF
  RTL

EDIT 2:
55h actually kinda sucks ngl.
i'm switching to 39h

39h ROM+RAM+Battery+SA-1+RTC-4513

I'm reading about RTC-4513 here.
Hope this helps anybody in the future as ambitious as me.

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