Single-board at last
To paraphrase Emperor Palpatine...
"And now, witness the power of this fully ARMED and OPERATIONAL ... Z80 computer!"
OK, so running at the current 40kHz system clock, it's got more milliamps than megaflops -- but at least it's running properly on one board (CPU, memory, controls, and LEDs all together.)
More about the milliamps to come: it's currently drawing over half an amp(!) at 5V -- almost all of which is going into keeping the 74LS245s warm. The parts should be in tomorrow to give it a quick "Energy Star" upgrade.
Click the image for a larger version. (The dials on the right are, from top to bottom, address-high-byte, address-low-byte, and data.)
"And now, witness the power of this fully ARMED and OPERATIONAL ... Z80 computer!"
OK, so running at the current 40kHz system clock, it's got more milliamps than megaflops -- but at least it's running properly on one board (CPU, memory, controls, and LEDs all together.)
More about the milliamps to come: it's currently drawing over half an amp(!) at 5V -- almost all of which is going into keeping the 74LS245s warm. The parts should be in tomorrow to give it a quick "Energy Star" upgrade.
Click the image for a larger version. (The dials on the right are, from top to bottom, address-high-byte, address-low-byte, and data.)
posted by M. Eric Carr at
01:20
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