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README.md

C16 for MiST

This is the MiST port of Istvan Hegedus' FPGATED project.

The source code of the modified version is available in the mist-board repository.

Usage

Copy the latest core version onto a SD card and rename it to core.rbf. Also copy C16.ROM to the root of the SD card.

ROMs

From 20190504 release, C16.ROM is required to put at the root directory of the SD-Card. The format of this file is C1541 + Kernal + Basic + (Function LOW + Function HIGH). Function ROMs are optional.

PAL/NTSC version

The TED chip can switch PAL/NTSC modes on the fly. The Kernal sets the appropriate register, so with changing the Kernal ROM, it is possible to switch the video standard. The default is PAL mode. You can load a new Kernal from the OSD menu, or permamently replace it with alternative versions with the method described above.

Loading and running programs

You probably also want to put some games in c16/plus4 PRG format onto the SD card, preferably into a c16 subdirectory. Once the c16 has booted use F12 to open the on screen display (OSD), select Load PRG and the PRG you want to load. The screen will flicker for a fraction for a second while the program is being loaded directly into the C16 ram.

Afterwards type RUN to run the game.

Using the 1541 floppy

You can also load from floppy images in D64 format using the built-in 1541. Use Mount D64 from the OSD to insert a floppy disk image in D64 format. The simply use the regular C16 methods to access the floppy disk. In most cases LOAD "*",8 and a subsequent RUN will be what you want.

SID extension

Selectable SID versions are in the OSD menu. Enabling one of them maps the SID to the FD40-FD5F and FE80-FE9F addresses.

Using a SCART TV

The C16 core supports the MiST's ability to disable the built-in VGA scandoubler. Using the appropriate cable the C16 core can thus drive a standard SCART TV. You can use component output, too.

History

  • c16_190921.rbf

    • TED fixes (Alpharay scrolling, Pets Rescue title screen, Adventure Park loading)

  • c16_190507.rbf

    • Fix a ROM corruption issue

  • c16_190504.rbf

    • Fix composite sync for scandoubled display
    • ROM is moved to SDRAM to free up FPGA BRAM. This means C16.ROM is now mandatory, no more built-in ROMs!
    • Function ROMs can be used
    • SID 6581 filters are enabled
    • TED sounds are a bit louder now

  • c16_190502.rbf

    • TAP file playback
    • SID extension

  • c16_190214.rbf

    • One core version for PAL/NTSC
    • Loadable Kernal ROM from the OSD menu
    • Disk change detection fix
    • Bigger OSD on VGA

  • c16_180905_PAL.rbf, c16_180905_NTSC.rbf

    • Updates and bug fixes to C1541 makes it work with every tested fastloader without timing hacks
    • Fixed PRG loader
    • All ROMs are replaceable

  • c16_180830_PAL.rbf, c16_180830_NTSC.rbf

    • Updated C1541 to a read-write version
    • Updated the CPU to an improved version of the T65 (both the machine and C1541)

  • c16_160811.rbf

    • Fixed C1541 disk image change detection

  • c16_160801-2.rbf

    • C1541 floppy disk implementation (read only)

  • c16_160801.rbf

    • OSD option to switch between 16k and 64k

  • c16_160729.rbf

    • Initial release