homebrewcpu - Slashdot User

Comment Re:But does it run.... ? (Score 1) 313

by homebrewcpu on Monday November 05, 2007 @06:13PM (#21247109) Attached to: DIY CPU Demo'd Running Minix

Thuktun writes:

However, I'm curious to know if it supports an HCF (Halt and Catch Fire) opcode

As a matter of fact, one of my earliest Magic-1 ISA designs included an HCF instruction along with an external output bit (similar to the 1802's Q bit) that HCF would set. My plan was to use that bit to trigger a flashing red fire alarm on the front panel. Sadly, I dropped HCF in a later revision.

Submission + - DIY CPU Demo'd Running Minix

Submitted by __aajbyc7391 on Sunday November 04, 2007 @02:43AM

__aajbyc7391 writes: Bill Buzbee offered the first public demonstration of the open-source Minix OS — a cousin of Linux — running on his homebrew minicomputer, the Magic-1, today at the Vintage Computer Festival in Mountain View, Calif. The Magic-1 minicomputer is built with 74-series TTL ICs using wire-wrap construction, and implements a homebrew, 8086-like ISA. Rather than using a commercial microprocessor, Buzbee created his own microcoded CPU that runs at 4.09 MHz, and is in the same ballpark as an old 8086 in performance and capabilities. The CPU has a 22-bit physical address bus and an 8-bit data bus.

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