Sunday, February 19, 2017

Lee Hart's Z80 Membership Card

I bought Lee's Z80 Membership Card as a kit more than a year ago but only just got around to building it.


Instead of trying to build it to fit in an Altoids can as originally designed by Lee, I decided to make the build a little bit more versatile for future expansion and used Arduino-style connectors to enable stacking additional cards below the CPU board.


It's a good thing I did as Lee is working on a Serial/RAM/SD-card board that will allow this little gem to run CP/M!

Along the way, I also discovered the joys of FTDI USB-Serial mini-boards. Yay! No more RS232 voltage converters! And painless serial console from my Mac.


My other touches of "customizations" include IC sockets for the TTL chips and a barrel socket for an external 5V power supply for when the FTDI is not being used. When the FTDI board is used, a short across pins 19 and 20 of J2 connects VIN to VCC, thus powering the whole setup from the USB port of the Mac.


2 comments:

  1. Nice build. Good idea to go below the CPU card, I did not think of that, it might have let me keep the front panel as a debugging aid in the early days of the olduino/Z.

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  2. I like the Z80 membership card too. A few days ago, I soldered the SIO card, CP/M works well from the SD card. Great work from Lee and Josh.

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