Erick Presents: Z80 CPU Homemade Computer

Description

Let me explore what of most amazing things I can do with obsolete and old technology looking through the eyes of its future, our present, to discover some hiden secrets, features and capabilities of those lovely and old things...

I am ALWAYS assembling and disassembling it... hahaha
Actually I am programing it in Z80 Assembly Language Syntax and recently I have started to study C Language. At the very beginning of it, I really was programing bit by bit as a really "Machine Language / Binary / Hex" programmer!!!...

Components

1 × CPU ZiLOG Z80 CPU - Z84C0020PEC - 20MHz

1 × Memory EPROM AT28C64-15PC

1 × LCD 20x4 - 2004A-V1.1

Project Logs

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Z80 on TV via AV
Erick M.B. d. S. • 11/27/2022 at 01:47 • 0 comments

One day I shall teach you how to do this only using a Z80 CPU without any special chip...
#z80 #tv
ZiLOG Z80 - curiosities
Erick M.B. d. S. • 11/27/2022 at 01:41 • 0 comments
Z80 CPU - Have you ever seen one?
Curiosities here:

Release:
- May 1976 by ZiLOG.
Number of transistors:
1. ZiLOG Z80 CPU: 8500.
2. Intel 8085 CPU: 6500.
3. Intel 8080 CPU: 4500.
Instructions:
- 158 different "instruction types" (FUNCTIONS) including all 78 of the Intel 8080A CPU [datasheet].
- Intel 8080 CPU instructions: 256.
  - 196 fully compatible with Z80;
  - 58 DIFFERENT intructions opcodes;
  - 2 UNCOMPATIBLE FUNCTIONS.
  - Z80 compatibility: 76,56%.
- Z80 CPU:
  - Documented instructions: 694;
  - Undocumented instructions: 710;
  - Total instructions: 1404.
My model:
- Part No. Z84C0020PEC.
  "84C00" means "CMOS technology".
  "20" means "20MHz max frequency".
  "PEC" means "unfilled Poly(ethylene carbonate)" - therefore: Temperature range: Extended industrial: −40 °C to 85 °C.
- "1822 GZ" = UNKNOWN DATA.
My Instagram: https://www.instagram.com/herr_marr/