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...
Z80
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...
12 February 2019
LM80C: Z80 CTC and interrupts
Today I had an idea, I thinked that a timer was wasted to just blink a LED. Why didn’t we...
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...
26 January 2019
LM80C: EEPROM programming
Once I chose the CPU and checked that it was OK, I started thinking about my next step. Having a...