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	<title>Big Mess o&#039; Wires</title>
	<link>http://www.bigmessowires.com</link>
	<description>A home-built CPU, and other messy electronics adventures</description>
	<lastBuildDate>Tue, 24 Jan 2012 20:02:38 +0000</lastBuildDate>
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		<title>Mouse Freeze Debugging</title>
		<description><![CDATA[Last October, Plus Too first booted successfully into the Macintosh Finder. Ever since then, it&#8217;s exhibited an intermittent mouse freezing bug. The FPGA Mac replica runs normally for a few minutes, during which the mouse works normally, and it&#8217;s possible to exercise menus, run programs, and do everything else you&#8217;d expect from a working Mac. But somewhere after a [...]]]></description>
		<link>http://www.bigmessowires.com/2012/01/24/mouse-freeze-debugging/</link>
			</item>
	<item>
		<title>Plus Too Interrupt Bug</title>
		<description><![CDATA[Mark McDougall (tcdev) discovered what looks like a serious bug in the way Plus Too handles interrupts. It appears my design causes the 68000 CPU to use the wrong interrupt handler vector! How it could work at all under those circumstances isn&#8217;t clear, since I would expect it to crash the moment an interrupt is [...]]]></description>
		<link>http://www.bigmessowires.com/2012/01/21/plus-too-interrupt-bug/</link>
			</item>
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		<title>Ready to Assemble</title>
		<description><![CDATA[It took longer than I&#8217;d expected, but all the parts needed to build three Floppy Emus have finally arrived! That&#8217;s three custom-made circuit boards from Dorkbot PDX, plus the SD card sockets, CPLDs, AVRs, and a whole pile of buttons, LEDs, and other components. Now it needs some soldering love. The boards from Dorkbot are [...]]]></description>
		<link>http://www.bigmessowires.com/2012/01/18/ready-to-assemble/</link>
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		<title>Parts Order By Mail</title>
		<description><![CDATA[Today I ordered the parts needed to build three Floppy Emu boards, the Macintosh floppy disk drive emulator. Everything should be here by next week, so I can start building! In these small quantities, the total cost for the parts is about $47 per board, which is a lot more than I&#8217;d hoped. If I [...]]]></description>
		<link>http://www.bigmessowires.com/2012/01/06/parts-order-by-mail/</link>
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		<title>Floppy Emu Board Layout</title>
		<description><![CDATA[Whew! It took me a long time to do the board layout for the floppy disk emulator, but here it is! The board is about 4 x 1.75 inches, or roughly the size of an elongated credit card. The resistors, LEDs, and odd-sized capacitors are all labeled, so any other small rectangular surface-mount parts you [...]]]></description>
		<link>http://www.bigmessowires.com/2011/12/18/floppy-emu-board-layout/</link>
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		<title>Three Crazy Ideas</title>
		<description><![CDATA[While I&#8217;m optimistic that the floppy write emulation technique described yesterday will work (at least for high speed cards), it would be great if I could buy an extra safety margin of time, or find a way of throttling the incoming data from the Macintosh during a write if it&#8217;s too fast. The biggest challenge [...]]]></description>
		<link>http://www.bigmessowires.com/2011/12/11/three-crazy-ideas/</link>
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