Problem with NTSC VIC-20 Core

garlicspy
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Problem with NTSC VIC-20 Core

Unread post by garlicspy »

In NTSC, the VIC-20 core is no longer functioning correctly. Many games lock up when they shouldn't.

Simple illustration: Dig Dug cartridge. Although the code is NTSC, it locks up in NTSC fairly quickly after booting up. It functions well in PAL.

Somewhere there's a timing problem.

VIC20_20200504.rbf is the latest version that doesn't do this. It does, however, suffer from sound distortion.

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LamerDeluxe
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Re: Problem with NTSC VIC-20 Core

Unread post by LamerDeluxe »

I will check this out.

I just received my RetroCastle YC adapter and the VIC-20 core with composite output looks impressively accurate.

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Re: Problem with NTSC VIC-20 Core

Unread post by Stinky »

Are you sure you have the latest release 20231208? There were NTSC issues prior to this release which were ironed out.

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Chris23235
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Re: Problem with NTSC VIC-20 Core

Unread post by Chris23235 »

garlicspy wrote: Tue Jan 23, 2024 4:51 am

In NTSC, the VIC-20 core is no longer functioning correctly. Many games lock up when they shouldn't.

Simple illustration: Dig Dug cartridge. Although the code is NTSC, it locks up in NTSC fairly quickly after booting up. It functions well in PAL.

Somewhere there's a timing problem.

VIC20_20200504.rbf is the latest version that doesn't do this. It does, however, suffer from sound distortion.

What are your core settings? Which version of Dig Dug did you try? I just tried the version on the MegaCart in NTSC mode and was able to play up to Round 6 without any issues.

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