#25: Z80 Assembly Language Tutorial (ZX Spectrum Game)
The Z80 Assembly Language instructions of a Sinclair ZX Spectrum car racing game are examined in detail. We also explore the ZX Spectrum Display and Screen Attributes as well as learn how to use Assembly Language to read input from the keyboard and pass a value from Machine Code to BASIC.
It's a wild ride so strap in and hang on!
LINKS:
Game Listing:
https://chuntey.wordpress.com/2010/01...
Z80 Instructions:
http://z80-heaven.wikidot.com/instruc...
Keyboard port numbers:
http://www.breakintoprogram.co.uk/com...
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Timestamps:
00:00 Intro
00:16 Welcome & topics
4:00 Copying the Assembly program listing
5:55 Running the program
7:00 Let's get started!
7:36 Opening the Debugger
11:40 Z-80 Heaven website
13:10 Interrupts
15:30 Program Counter register (PC)
17:17 The Stack
21:10 Stack Pointer register (SP)
21:25 Interlude #1
23:18 Logical instructions (AND, OR, XOR)
28:30 Flag register (F)
1:03:05 Reading the keyboard (IN command, Port numbers)
1:11:03 Interlude #2
1:12:30 BASIC Programming
1:14:45 ZX Spectrum Screen Display
1:16:26 ZX Spectrum Screen Attributes
1:19:30 Screen Attributes color byte values
1:27:38 USR to pass the value of BC register from Machine Code to BASIC
1:28:40 My BASIC program to print the instructions and score.
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