Commodore 64R MK2

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Commodore 64R MK2

Commodore 64 Reloaded MK2 är ett C64 moderkort avsett för ändamålet att kunna bygga din egen C64. Kortet levereras med tomma ZIF-socklar för montering av fundamentala chipset som CPU, port chip, chip för ljud och video. Alla övriga komponenter är redan assemblerade och testade innan leverans.

The Commodore 64 Reloaded MK2 is a C64 Motherboard for building a C64 on your own. The board is shipped with empty ZIF sockets for the key chips such as CPU, port chips, sound/video chips. All other components are already assembled and pre-tested before shipment.
Commodore 64 Reloaded MK2

  1. Product information

  • For building a C64 computer with this board, you need to supply the key chips on your own:
    • CPU 6510 or 8500
    • Two pcs. CIA 6526 or 8521
    • Video chip 6567, 6569, 8565 or 8562
    • One or two sound chips 6581 and/or 8580
  • The Commodore 64 Reloaded MK2 includes the following on the board:
    • All memory
    • Flash rom for Kernal, Basic, Character and your own sets of ROMs
    • Clock generator equivalent to the CSG8701 chip with two custom crystals
    • PLA equivalent to the CSG 906114-01 chip
    • Stereo-SID circuit configurable for three different popular addresses
    • S-Video and 3.5mm stereo outputs
    • USB to serial link for configuring the board with a terminal program
    • High-efficiency power conversion for operation from a single 12V supply
    • Power switch with integrated reset function
    • Six all-black high quality ZIF sockets
  1. Included in package

  • Commodore 64 Reloaded MK2
  • User guide

As opposed to the first C64 reloaded board, the C64 Reloaded MK2 will automatically identify the installed chips. It will not only generate the correct clocking, but also set the right voltages for the chips that you have chosen. Further, it configures the filter-capacitors for your favourite SID combination. This means that the Commodore 64 Reloaded MK2 is a completely jumper-free design.

C64 Reloaded MK2 fits in all original C64 cases: The classic "breadbox" cases and the flat versions of the case that were used in later production years. This includes the brand-new cases that were produced recently in a popular Kickstarter project, and of course our own C64 Cases.

All required voltages (5VDC, 9VAC) are generated on board and are available at external interfaces as expected (tape, userport, expansion port, joystick port). 12VDC is taken directly from the PSU. A protection circuit keeps excess input voltage from valuable chips.

The C64 Reloaded MK2 does not come with a TV-Modulator. There's an S-Video output in it's place, which is located in place of the RF output. At the S-Video output a 330Ohm resistor is installed in the chrominance line, which makes the signal more suitable for modern displays.

Audio is passed to the outside world through a 3.5mm stereo plug, which lets you use standard audio equipment. It is located in place of the channel switch, so no additional holes must be drilled into the computer case.

The known connectors for joysticks, cartridges, monitor, floppy drives, data cassette and userport are of course available on C64 Reloaded MK2.

The processor (CPU), the sound chip (SID), the I/O chips (CIA) and video chip (VIC-II) are in zero-insertion-force sockets, so they can be exchanged easily.

Proper 50/60Hz signal for the CIA TOD clocks is generated on board depending on selected video mode. The time base for this is another crystal oscillator, which is running independent of the main C64 clock circuit.

All ROMs are kept together in one Flash-ROM. The board can be equipped with four Kernal ROMs (three custom) and two character ROMs (one custom).

The power switch is a 3-position switch that has a "momentary" up-position, which is used to reset the machine. This gives you a reset-button without the need to drill a hole into a classic case.

The power button "reset" switch and the RESTORE key can be configured to switch some configuration options

A video effect known as "VSP-effect" to the C64 scene leads to intermittent crashes of some C64 models, which is also known as the "VSP-bug". Since the C64 Reloaded MK2 boards use SRAM instead of DRAM, this problem has been eliminated.

Gold plated user- and tape ports

Comes including metal frame around the expansion port, like the original computer.

The final board is black with white silkscreen print and uses custom black zif sockets. Valid HTML 4.01 Strict

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