UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

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darleiv
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Joined: Wed Feb 23, 2022 10:55 pm

UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by darleiv »

project finish ( REVERSE ENGINE PCB VRCX )
all queues are for download
notes on the vrc2a mapper:
note that A10 CHR VRC addresses are NC. and ROM address CHR A10 A11 A12 A13 A14 A15 A16 are connected with 1 bit + in VRC. VRC CHR A18 on GND. (VRC support 512k CHR lol o0)
https://drive.google.com/drive/folders/ ... sp=sharing
img08052022_002.jpg
img08052022_001.jpg
pcb scan KONAMI 351618 front back contribution mapper VRC 2A

I came across differences in the chr rom of the konami vrc2a mapper and I decided to maper a pcb is not finished yet , concluding post here
1a.JPG

PROJECT FINISH - PCB VRC2A
twinbe3.JPG
twinbe3 SPRINT.LAY6.rar
(45.85 KiB) Downloaded 6 times
BY: NinjaGamer BRASIL
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Ben Boldt
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Location: Minnesota, USA

Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by Ben Boldt »

Looks good. What software did you use? Please also check out Krzysiopcb. Krzysiobal made it for this purpose. It interfaces to Eagle, works with the last free version of Eagle.
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aquasnake
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Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by aquasnake »

Sprint Layout???
darleiv
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Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by darleiv »

vrc2x compatible games ( note . vrc2a does not run on vrc2b. )
and not the other way around either
vrc2b is connected a10 on a10 a11 on a11 chr etc
mapper 22 uses unique vrc connections in chr rom

https://nescartdb.com/search/advanced?unif=KONAMI-VRC-2
darleiv
Posts: 24
Joined: Wed Feb 23, 2022 10:55 pm

Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by darleiv »

Ben Boldt wrote: Wed May 11, 2022 3:24 pm Looks good. What software did you use? Please also check out Krzysiopcb. Krzysiobal made it for this purpose. It interfaces to Eagle, works with the last free version of Eagle.

I also made kid dracula was posted on the forum. I don't know if the post is still active
my chanel https://www.youtube.com/channel/UCGY_Lr ... XiA/videos
I make the drawings in any software. I mess with this for 15 years
example in the next photo
kid_dracula (2).jpg
NEXT >>>
01 (46).jpg
01 (42).jpg
01 (18).jpg
DSP1-KART3.png
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Ben Boldt
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Location: Minnesota, USA

Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by Ben Boldt »

darleiv wrote: Thu May 12, 2022 2:37 pm vrc2x compatible games ( note . vrc2a does not run on vrc2b. )
and not the other way around either
vrc2b is connected a10 on a10 a11 on a11 chr etc
mapper 22 uses unique vrc connections in chr rom

https://nescartdb.com/search/advanced?unif=KONAMI-VRC-2
Hackable though, it isn't too bad to find all the registers and flip the bits. I did that with at least 1-2 of these when I made a VRC2/4 multicart years ago. I think some games can mix VRC2 and 4 pretty much too, I can't remember the differences but they are really similar.
lidnariq
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Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by lidnariq »

Ben Boldt wrote: Thu May 12, 2022 3:36 pm Hackable though, it isn't too bad to find all the registers and flip the bits. I did that with at least 1-2 of these when I made a VRC2/4 multicart years ago. I think some games can mix VRC2 and 4 pretty much too, I can't remember the differences but they are really similar.
VRC4 was clearly intended to be upwards compatible with VRC2, but the wiki documents the one buggy VRC2 game that has issues with it (where it writes $FF to the mirroring control register by accident but wants VRC2's $01 = Horz instead of VRC4's $03 = 1scB)
darleiv
Posts: 24
Joined: Wed Feb 23, 2022 10:55 pm

Re: UPD-FINISH-reverse engine: pcb scan KONAMI 351618 front back contribution mapper VRC 2A

Post by darleiv »

lidnariq wrote: Thu May 12, 2022 10:01 pm
Ben Boldt wrote: Thu May 12, 2022 3:36 pm Hackable though, it isn't too bad to find all the registers and flip the bits. I did that with at least 1-2 of these when I made a VRC2/4 multicart years ago. I think some games can mix VRC2 and 4 pretty much too, I can't remember the differences but they are really similar.
VRC4 was clearly intended to be upwards compatible with VRC2, but the wiki documents the one buggy VRC2 game that has issues with it (where it writes $FF to the mirroring control register by accident but wants VRC2's $01 = Horz instead of VRC4's $03 = 1scB)

excellent. I'm still looking for the AX5208C documentation (AX5208P is different) I noticed that my kid dracula cart doesn't work with the ax5208C. (AX5208P works) weird right?
002 (9).jpg
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