27 March 2019
LM80C: first video image!
Finally, I was able to get a video image! I’ve spent the past 2 weeks fighting with a problem that...
zilog
11 March 2019
LM80C: how to expand the BASIC interpreter
I’ve spent the last 10 days trying to modify the NASCOM BASIC to add new commands to the interpreter. The...
28 February 2019
LM80C: let’s drive the Z80 PIO by BASIC
Assumed that the LM80C is actually fully functioning, we can try to use it as a real computer. The NASCOM...
26 February 2019
LM80C: BASIC!
The next, logic, step for my LM80C, once I’ve been able to set up a functioning serial comm between my...
21 February 2019
LM80C: Z80 SIO and serial communication
After several days since my last article on my Z80-based home-brew computer I came back to talk about my experiences...
11 February 2019
LM80C: let’s add a Z80 CTC
After the last changes, our prototype begins to get a (very far) appearence of a real computer. We have a...
7 February 2019
LM80C: PIO & RAM test
I was at a point where I couldn’t do more of these tests with what I’ve added to my little...
6 February 2019
LM80C: first run! Testing a Z80 PIO
In one of my previous articles I wrote about how I set up an EEPROM programmer to write the code into...
6 February 2019
LM80C: clock & reset
Beyond the power lines, to work properly a CPU need some signals. The very basic ones are the reset and...
7 January 2019
LM80C: the Zilog Z80
Once I chose the CPU, I started studying it. Altough I used 8-bits computers, at the time I was too...