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Guy Makes His Own CPU, Running at 2Mhz, can be overclocked! Guy Makes His Own CPU, Running at 2Mhz, can be overclocked!
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Guy Makes His Own CPU, Running at 2Mhz, can be overclocked!
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Old 29th May 2009, 10:42   #1
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Default Guy Makes His Own CPU, Running at 2Mhz, can be overclocked!

BMOW 1 borrows liberally from other homebrew designs, as well as the MAYBE design presented in the book Computation Structures by Stephen Ward and Robert Halstead. Data busses are 8 bits wide, and the address bus is 24 bits. Four 8-bit registers are used for general data, and three 24-bit registers store the program counter, stack pointer, and a scratch/working address pointer. Registers and the arithmetic and logic unit are interconnected by one data bus, while RAM, ROM, and memory-mapped hardware devices use a second data bus. The ALU also has dedicated left and right data input busses.

Machine language instructions are implemented as a series of micro-instructions, stored in three parallel ROMs to create a 24-bit microcode word. One micro-instruction is executed each clock cycle, and the micro-instruction bits are used directly as enable and select inputs to control all the chips in the machine. Up to 16 micro-instructions may be needed to implement a single machine language instruction.

* Current clock speed is 2MHz. It could theoretically go to about 3MHz (untested).
* 512 KBytes of RAM, 512 KBytes of ROM.
* Power draw is 10 Watts, 2.0A at 5V.
* VGA video output is 512480 with two colors, or 128240 with 256 colors.
* Audio and music is provided by a three-voice programmable sound generator.
* Keyboard input is a standard PC keyboard with PS/2 connector.
* Debug display is a 242 character text LCD.
* There are roughly 1250 wires connecting the components, so 2500 individual hand-turned wire wraps.
http://www.stevechamberlin.com/cpu/2...oject-summary/
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Old 29th May 2009, 11:52   #2
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Insane
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Old 29th May 2009, 12:23   #3
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You need quite a big socket to use it, though
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Old 29th May 2009, 12:29   #4
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Don't think this one is build for socket use, it has a direct interface to the rest of the "PC"
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Old 29th May 2009, 12:37   #5
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Yes ... it was a (maybe lame) joke
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