Author Archives: M. Eric Carr

Z80 computer LED display

Posted on 2008-10-03 by M. Eric Carr

The Z80 computer now has its name in lights! (See video; I apologize in advance for the horrible low resolution and mp4 artifacts.) Dr. Rosen and I got approval to buy an Alpha 215R single-line LED display as a demo … Continue reading →

Posted in Digital, DrACo/Z80, Drexel, EET325 | Leave a comment

Much Ado About Nothing

Posted on 2008-09-28 by M. Eric Carr

Sometimes, nothing is exactly what you need. A specific amount of nothing, to be precise. Here is a delay library, written in assembly, for PIC microcontrollers running at 8MHZ. If you find it useful, please let me know. Share and … Continue reading →

Posted in Coding, Digital, PIC Microcontrollers | Leave a comment

It works! (again)

Posted on 2008-09-05 by M. Eric Carr

Bill (Dr. Rosen’s independent-study student) stopped by the lab today to work on his Z80 computer. After tracking down a few bugs, we got it working! I loaded the Fibonacci test program into it, and saw it execute the JMP … Continue reading →

Posted in Digital, DrACo/Z80, Drexel, EET325 | Leave a comment

First peripheral

Posted on 2008-08-31 by M. Eric Carr

The first peripheral for the Z80 is working (although still somewhat alpha at this point): a two-line LCD text display. It’s mapped as I/O ports 0x00 and 0x01, with control commands being sent to 0x00 and data to 0x01. It’s … Continue reading →

Posted in Coding, Digital, DrACo/Z80, Drexel, EET325 | 1 Comment