Electronics

Z80 Project Mark 2: More UART Shenanigans Mon, 01/18/2010 - 22:38 — nathan

A couple of minor updates you might be interested in. I got a quick demo echoing characters back to the PC working last week. This uses the interrupt on receive feature of the UART setup to trigger a send routine as soon as a character is received. The demo code is available on the Z80 Project page.

Nathan's Z80 Project Mark 2: Serial bug killer Sun, 01/10/2010 - 21:50 — nathan

I left my Z80 project behind when I went to see family over Christmas, I did do a tiny bit of coding while I was on holiday but not much. Back in snowy Bath this weekend I got some more done on the project. I've spent a lot of time on the documentation. The main reason for this is the fact that I keep doing bits then not looking at it for a couple of weeks and I forget where I was and what changes I'd made.

Nathan's Z80 Project Mark 2: An actual Z80!! Sun, 12/06/2009 - 18:20 — nathan

At long last I've fitted a Z80 into the Z80 computer. I know shocking isn't it. After months of tinkering with it and fiddling with things using the on-board PIC I finally got the boot code sorted out and the clock generation (in the new file called boot.asm). After some serious head scratching about why id didn't work, I got it all running smoothly and counting on the debug port LEDs.

New Code

Nathan's Z80 Project Mark 2: Memory Installed! Sun, 10/18/2009 - 21:08 — nathan

More progress on the Z80 project; I have fitted the first RAM chips tonight. After sorting the code so far into 3 source files, I implemented the memory read and memory write functions. These appeared to work on single memory locations, so I implemented the block read and write functions. Using a Python script (see the Z80 Project page for the file) I wrote the XOR combination of the high and low address bytes to each memory location, then read the memory back and tested it against this value.

Nathan's Z80 Project Mark 2: Tidying and Sorting Wed, 10/14/2009 - 22:36 — nathan

I've re-arranged the site a bit. I've added a new section with its own link at the top of the site entitled "Z80 Project". This page gives quick access to all the information on the project and links to downloads. At the moment I've not put much on the page, but I'll add stuff as I get it sorted enough to publish.