VIC-II Kawari 'Large' 6567/6569 Replacement For C64 Breadbins

• Outputs S/LUM + CHROMA (at rear port of machine)

• Micro-HDMI port

• Unpopulated analog RGB header (requires cable building/soldering skills)

• Soft/Hard Switchable between PAL/NTSC

• Programmable/Configurable color palette

• Additional 64k RAM

• 80 column and new hi-res modes

• Vertical white line killer

• Suitable for 250407, 326298, 250425 & KU-14194HB motherboards

NOTE: For 250425 boards, the large RF shield that sits under the keyboard should be left out.  For the other revisions, the cover of the RF shield enclosure must be removed.

This model comes with on-board oscillators for both NTSC and PAL clocks and can therefore bypass broken clock circuits.  However, some specialty cartridges that use pin 6 of the cartridge port will not function unless the motherboard's clock circuit is used (i.e. SuperCPU, Wifi Cartridges, REU). For these cases, the PCB can be configured to use the motherboard clock for one of the video standards (i.e. the machine's native standard).  Normal game cartridges will operate on either pcb or motherboard clocks.

DVI Limitations Summary

1. May not work on older monitors or TVs (non-standard resolutions)
2. You won't get a 4:3 aspect ratio unless your display has the option
3. You may have to turn off the display or use an HDMI switch to boot the C64 or reset changed colors/new hires-modes
4. Using the motherboard oscillator may result in loss of sync

DVI Limitations Details

1. The resolution/timing the board outputs is not a standard resolution. Some older TVs/monitors may not sync to it. Some HD Capture cards only accept standard resolutions as well (like 720p or 1080p) and will also not sync.

2. The display will be horizontally stretched on most HDMI displays. You will not be able to get a perfect 4:3 aspect ratio. Some displays have an aspect ratio option that can yield a better result. There are no plans to do any processing on the output (i.e. scaling).

3. HDMI monitors can power the FPGA core through the HDMI cable. This prevents the core from booting properly (or sometimes booting at all). It's an unwanted side-effect of driving the TMDS lines directly from the FPGA core. This device is not an HDMI device, it is DVI over an HDMI connector. A buffer IC is required to avoid this but would add more cost to the board. The work around is to either power off the monitor or use an HDMI switch.

4. The quality of the motherboard clock is not sufficient to derive the 40x dot clock required for the DVI signals. It appears the high jitter on the crystal is the cause. The motherboard clock was never meant to go through a clock multiplier to high frequencies. This appears to cause sync loss especially on NTSC boards. For this reason, the on-board oscillators should be used to drive the digital display modes.

Soft Reset + HiRes Modes / Color Registers

Please note that if you change color registers or enable hi-res modes, Kawari will not revert back to the default palette or lo-res modes with a soft reset (or even RUN/STOP restore). If you want the Kawari 'Large' model to detect soft resets, you can connect the through hole pad labeled RST in the upper left corner of the board to the 6510's RESET pin (or any other RESET location) using a jumper wire and grabber.

Cartridges that use DOT clock pin (pin 6)

A cartridge that uses the DOT clock signal on pin 6 may not work when the clock source is set to the on-board oscillator. The signal that reaches pin 6 of the cartridge port comes from the motherboard clock circuit and will likely be out of phase/sync with the clock generated by the on-board oscillator. In this case, you can configure your Kawari to use the motherboard's 'native' clock instead of the on-board oscillator. Note, however, that only the machine's 'native' video standard will work with such a cartridge. Since the vast majority of cartridges do not use pin 6, this should not be a problem for most users.

Turn off Pi1541 GraphIEC Feature

The Pi1541 has a feature that displays the IEC bus information to its display. This can interfere with tight timing requirements on some demo fast loaders (even on a genuine VIC-II chip) and can lead to corrupted data loaded into memory. If you are experiencing random crashes on demos like 'Uncensored', 'Edge of Disgrace' or similar demos, this is likely the cause. It is recommended you turn this feature off by adding 'GraphIEC = 0' to your options.txt.