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MJoergen / C64MEGA65

Commodore 64 core for the MEGA65 based on the MiSTer FPGA C64 core
GNU General Public License v3.0
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Internal floppy drive keeps spinning when floppy is inserted #110

Closed MauriceMEGA65 closed 7 months ago

MauriceMEGA65 commented 7 months ago

In C64 core (tested with V5 and 5.1 alpha), the floppy drive keeps spinning when a floppy is inserted. Info here on Discord: https://discord.com/channels/719326990221574164/794775503818588200/1173362893924864061

The floppy drive behaves normally in MEGA65 core.

sy2002 commented 7 months ago

@MJoergen I assume this has something to do with the fact that we are literally not yet connecting ANY of the FPGA's outputs to the floppy drive and therefore we are not telling it to be in a "quiet idle mode". In contrast to the MEGA65 core...

MJoergen commented 7 months ago

Hmm. In V5 the FDC pins are unconnected, and likewise in V5.1A1. However, since V5.1A2 the FDC pins are all tied to ground. So @MauriceMEGA65 , do you know which V5.1 alpha you see this on? It says so in the OSM, on the "about" page at the bottom.

MauriceMEGA65 commented 7 months ago

Version 5.1A3, see also the movie in the link above

MJoergen commented 7 months ago

I've confirmed the same behavior on my R4 board.

MauriceMEGA65 commented 7 months ago

Good to know you can reproduce the issue! And already solved? If you have a new alpha version to test then please let me know if you want me to test it.

sy2002 commented 7 months ago

@MauriceMEGA65 : Yes @MJoergen was able to reproduce it and solved it. If you want to test: @MJoergen Can you post a bitstream here? I can turn it into a .cor for @MauriceMEGA65 .

sy2002 commented 7 months ago

@MauriceMEGA65 Can you confirm that this core fixes the spinning floppy for you? c64m65v51-d4d294b.zip

MauriceMEGA65 commented 7 months ago

Yes, solved!!

But something else I just discovered: Pac-man needed to have the hard reset to be fixed, which is done in one of the alpha versions. However, I just encountered the following:

  1. Hard-reset DOES properly reset the system, I'm back in the BASIC 2 or JiffyDOS screen
  2. When I do a soft-reset AFTER the hard-reset, I'm back in the Pac-man welcome screen!?!?
sy2002 commented 7 months ago

@MauriceMEGA65 Thank you for sharing your feedback about this issue here: Internal floppy drive keeps spinning when floppy is inserted. We cannot mix different topics in one issue. This goes contrary to the concept of an issue tracker, so we will not follow up on your Pacman observations here.