Monster 6502

Ein riesiger 6502 aka der Prozessor des Apple I, Atari 800 oder des Commodore VC-20. Seine Nachfolger steckten unter anderem im C64 (6510) und im Atari 2600 (6507). Und jetzt gibt's diese Chip-Urmutter aller Heimcomputer in groß zum Andiewandhängen oder so. (via Fabu)

A dis-integrated circuit project to make a complete, working transistor-scale replica of the classic MOS 6502 microprocessor.

The 6502 is the famous processor found at the core of such influential computer systems as the Apple ][, the Commodore PET, the Atari 400 and 800 home video game consoles, the BBC Micro, and the Tamagotchi digital pet. Slight variations of it were found in the Commodore 64, the Atari 2600, and the original Nintendo Entertainment System.

What's with the name and capitalization?
MOnSter 6502 is a play on the original manufacturer and device name (MOS 6502) as well as acknowledging its large size.

How big is it?
It's a four layer circuit board, 12 × 15 inches, 0.1 inches thick, with surface mount components on both sides.

How many components are there on the board?
In total, there are 4769 components on the board. There are 3218 transistors and 1019 resistors that comprise the "functional" part of the 6502. In addition to these, there are also LEDs sprinkled throughout that indicate the values of various control lines, registers, and status bits, as well as additional transistors and resistors (not counted in those "functional" totals) that are necessary to drive those LEDs.
As of the second revision of the board, the design statistics are as follows:

Components that correspond 1:1 with transistors in the original 6502:
Total active transistors: 4237

  • 3218 enhancement mode n-channel MOSFETs (2588 discrete, 630 located on 164 quad transistor array chips [26 of these 656 transistors are not used])
  • 1019 resistors (the original 6502 used depletion mode MOSFETs in place of resistors)

998 Additional parts present only in the MOnSter 6502:

  • 313 LEDs (The first revision board, shown in the video, has only 167 LEDs)
  • 270 extra MOSFETs for driving the LEDs
  • 20 filter capacitors
  • 32 bus capacitors
  • 2 zero-ohm jumpers for net tie reasons
  • 8 current limit resistors
  • 314 resistors for the LEDs
  • 36 diodes for ESD protection
  • 2 jacks for 5 V power: main and alternate location
  • 1 rectangular connector for the 40-pin "ICR" ribbon cable

Total parts: 4769

Are you nuts?