New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
V9990 bug related to R#22 #90
Comments
Hello... Wow, that's odd. Thanks for reporting!
You mean then that it is impossible to disable only the pattern layers A
and/or B and leave the sprites active?
Paulo
…On Wed, Nov 30, 2022 at 7:18 PM André Baptista ***@***.***> wrote:
Hi guys, me and some fellows on MSX.org found a bug on the V9990
implementation, more specifically on R#22:
The two higher bits (bits 7 and 6) are supposed to disable layers AND
sprites, not just the tile patterns layer.
The documentation <http://msxbanzai.tni.nl/v9990/manual.html>states:
SDA: Set to "1" to disable layer "A" and sprites.
SDB: Set to "1" to disable layer "B" and sprites.
The discussion can be viewd here
<https://www.msx.org/forum/msx-talk/development/samurai-shodown-unplayble-demo-on-msxv9990?page=3>
(page 4 onwards).
If necessary I can provide a test ROM showing the bug.
—
Reply to this email directly, view it on GitHub
<#90>, or unsubscribe
<https://github.com/notifications/unsubscribe-auth/AAFOLIE37YPW6RFWCMB54GTWK7HCXANCNFSM6AAAAAASQDWNPY>
.
You are receiving this because you are subscribed to this thread.Message
ID: ***@***.***>
|
I made some ROMs to help openMSX folks to fix this same issue on openMSX: openMSX/openMSX#1466 Maybe it helps here too. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Hi guys, me and some fellows on MSX.org found a bug on the V9990 implementation, more specifically on R#22:
The two higher bits (bits 7 and 6) are supposed to disable layers AND sprites, not just the tile patterns layer.
The documentation states:
SDA: Set to "1" to disable layer "A" and sprites.
SDB: Set to "1" to disable layer "B" and sprites.
The discussion can be viewd here (page 4 onwards).
If necessary I can provide a test ROM showing the bug.
The text was updated successfully, but these errors were encountered: