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by Lord Nightmare
Mon Mar 07, 2022 7:51 pm
Forum: MAME Discussion
Topic: SN76489 Series LFSR Confusion
Replies: 3
Views: 4876

Re: SN76489 Series LFSR Confusion

We discussed this on IRC last night. In short (and this matches what was posted above): Some of the LFSR variants in sn764xx and other PSG chips have clocked latches after the LFSR causing a 1-3 bit delay before the most recent lfsr bit is actually used. The LFSR is implemented as a rightward-shifti...
by Lord Nightmare
Tue Jul 28, 2020 8:57 pm
Forum: MAME Discussion
Topic: problem compiling
Replies: 10
Views: 18605

Re: problem compiling

You may have a 64-bit only installation of mingw32-w64 then. Try this: pacman -U /var/cache/pacman/pkg/mingw-w64-x86_64-gcc-10.1.0-3-any.pkg.tar.zst /var/cache/pacman/pkg/mingw-w64-x86_64-gcc-libs-10.1.0-3-any.pkg.tar.zst and assuming you had gcc 10.1.0-3 installed, that should work to downgrade you...
by Lord Nightmare
Fri Mar 02, 2018 5:51 pm
Forum: Work In Progress (WIP)
Topic: SH4's FSRRA
Replies: 5
Views: 52159

Re: SH4's FSRRA

Balrog pointed out there are a few Hitachi patents which may cover FSRRA and might explain how the algorithm works:

https://patents.google.com/patent/US5293558
https://patents.google.com/patent/US5631858
https://patents.google.com/patent/US5956263

LN

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