Minimig AGA update


I’ve just released an updated version of the MinimigAGA core for all three of my current target platforms – TC64 version 1, TC64 version 2, and MiST.

The core doesn’t have 100% feature parity between the three platforms, since the MiST has an onboard microcontroller to handle input and storage, while the Chameleon doesn’t. Having to implement an equivalent microcontroller in the FPGA makes some things harder – but other things easier.

For this reason, this time around the TC64 ports have a feature not yet available on MiST – experimental floppy drive sounds. To enable this, simply copy the drivesnd.bin file onto the SD card. If you don’t like it, just delete the file again – there isn’t (yet) a way to turn it on and off from the menus.

Other changes this time include the addition of a very basic LED Audio filter implementation – not accurate, but just good enough to make the going-through-tunnels sound effect in Lotus II work, and Slingshot on Atari-Forum has put some hard work into debugging the CPU core, and found an issue with stack frames which was preventing certain Graftgold games from working in ‘020 mode. His fixes to the CPU are included.

I’ve also made some timing tweaks on all three platforms so that all of them build with clean timing reports.

Turbo Chameleon 64 users can find the latest version of the core here

MiST users can find the latest core here

4 thoughts on “Minimig AGA update

  1. Hello,

    it seems that the MinimigAGA cores (I tested MinimigAGA_TC64V1_20200921 and MinimigAGA_TC64V1_20200823) are unstable when using the Chameleon V1 in the docking station and accessing an ADF-file. Tested multiple configurations (68000, 68020, Kickstart 1.3, Kickstart 3.1, no fast ram, max fast ram).

    Problem: When accessing df0: in docking station mode random crashes (reboots) can be observed.

    When using the Chameleon V1 in standalone mode, floppy access seems to be stable in docking station mode.

    There is a minor index glitch in the menu. When returning from the About or Supporters section back to the superior menu level, the highligted selection is only visible when you navigate up or down with the arrow keys. When returning from the Reboot section, Reset is highlighted.

    Great work! Do you plan to include a “Return to Chameleon” menu point like in the non-AGA-core (Minimig_TC64V1_2019-11-16)?

    Best wishes,


    • Thanks for the bug report – I’ll see if I can reproduce it. I will attempt to add the return-to-chameleon option at some stage – however it wasn’t reliable on the ECS core, so I clearly need to put more effort into making it work properly if I do add it again.

    • I wrote nonsense:

      When using the Chameleon V1 in standalone mode, floppy access seems to be stable (delete “in docking station mode”).


      • It’s OK, I understood you. I think I’ve found the problem – it seems to be related to the reset pin from the Amiga keyboard header. I’ll release an updated core soon, so you can see if ignoring this signal fixes the problem.

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