Z80 Computer - Part 16 Live Coding

Let's do some live coding. What is the worst that could happen?
In this video I try coding a short Z80 assembly program to read input from the trainer board's on-board push buttons. Depending upon which button is pressed we should send a number from 0 to 7 to an output port.
I have an idea how I might be able to use something like this to control part of the system in the future.

[@kaylanrocha9645]

I'm following the series with enthusiasm, I even incorporated the idea of ​​the 7-segment display into my project

[@SteveRaynerMakes]

That's awesome to hear. Let me know if there is anything you want to see in upcoming videos.

[@SteveRaynerMakes]

Ok, that didn't go as smooth as I had expected. I want to use this program to control a latch, and I figured we could test it with the output 7-segment LEDs, as they have latches on their driver chips. Which also gives us a bonus of displaying the value that is in the latch.

[@SteveRaynerMakes]

I was watching this on a mobile phone, and clearly the font size is too small and unreadable. I'll try to make it bigger if I ever do this again.

[@mikekaffetzakis]

Hello Steve the subroutine found_bit is wasting memory and speed on line 21 put JR NC, OUTPUT, add on OUTPUT the DEC B and get rid of the found_bit sub

[@tiborbogi7457]

I like your step by step approach. Really not that easy to read text even on 27" monitor. I am only hobby programmer, made some asm programs for PIC controllers. You use call - ret even if you use subroutine only once (for labeling the function instead of using comments) , clearly a professional programmer style. I am able to follow, what you doing, that's nice.

[@SteveRaynerMakes]

Thanks. Yeah, we didn't really need subroutines here. I think I'm so used to programming in higher level languages. When it comes to Z80 it's better to be as efficient as possible, which this is not. But it's not too important at this early stage.

[@SteveRaynerMakes]

I went back and looked at the text size on ASM80.com. This is the largest you can set it to which is a real shame because I want to keep using it.

[@SteveRaynerMakes]

Although being a web application we can adjust the CSS to anything we want. So I'll try to set the font size higher in any future videos (if I remember).

[@tiborbogi7457]

@aynerMakesThank for answers. You are right for all points you made. Do, how you like it, its your project. Recently I made a VGA raster generator with PIC, then I tried used timers. Then I abandoned that project. PIC 18f2550 is not fast enough to generate VGA picture. DrMattRegan has some ideas how to generate VGA picture, so may be I become inspired and resume and continue my 8 bit comp build.