Table-of-Contents:

• General Information about Z80-Family
• Basic Information:
  • Architecture
  • Data Sheets
  • Instruction Set
  • Hardware
    • Chip Pinouts
    • Circuit Schematics
  • Software Tutorials
• Special Items:
  • Special Items (Z80)
• Operating Systems for Z80
• System Busses for Z80 Family
• Products based on Z80 Family
  • Boards, Modules and Sub-Systems
  • Computer Systems
  • Game Machines
  • Video Display Terminals
• Source Offers
• Source Requests
• Requests for DocumentsDocuments which would be nice to have online.
• Projects, Homebrew z80 systems
• Software Development ToolsAssemblers, Compilers, Simulators, and more.
• Emulators and I.C.E.
• Chip Distributors
• Miscellaneous and more general Stuff
• Other's Home Pages with Z80 Stuff
• (Z80) Mailing Lists you may subscribe to
• Usenet Newsgroups (somewhat) related to Z80
• Magazines for Z80 Users
• Literature about Z80 (in List Form)Thanks To Leonhard Schneider
• Literature about Z80 (in Table Form)Thanks To Dines
• Various useful z80 related sites

General Information about Z80-Family

• Z80 CPU PicturesSee what we are talking about.
• Zilog inside!An even closer view (for VERY curious folks :-)
• Z80 Lives!by Jack G. Ganssle
• Brief Description and Introduction to the Z80 CPU
• Zilog, Inc.Thanks to Zilog, they made it (the chip)
• Zilog Z80382 8-Bit MicroprocessorBrief Description, Block Diagram and Pinout
• Z80 Family Questions & Answers, from Zilog Product Specs Databook.

Basic Information (Architecture)

• Z80 CPU simplified Block DiagramSee some of the internal stuff in the CPU
• Z80 CPU Architecture Block Diagramwith info about the registers.
• Z80 CPU Architecture Block Diagram ( German ) by
• Z80C015 CPU Architecture Block Diagram ( German ) Integrated Z80 with PIO SIO CTC all in one IC
• PowerPoint Presentation of the Z80 CPU internal block diagram, showing active lines and microinstructions in each T state during execution of 4 assembler instructions and INT request (Italian and English).
• The z80 has a 4-bit ALU, by Ken Shirriff.

Basic Information (Data Sheets)

Basic Information (Instruction Set)

• Introduction into Z80 Instruction SetBe aware of the fact that style how statements are arranged in examples reflects non-standard features offered by ZINT Z80-Interpreter
• Z80 Assembler Syntaxwith detailed information about instructions, still under construction!
• Z80 Instruction Set Summarywith brief explanations
• Z80 OpCode Formation Rulesrudimentary
• Z80 programming guidebased upon the original Zilog manuals and restructuring of the data. Contains both an HTML version of the enclosed table and a GIF image of the z80 machine code quick reference. By Mary Bell.
• Learn TI-83 Plus Assembly In 28 Days- Z80 Instruction Set, by Sean McLaughlin.
• Z80 instruction set table. Set of seven tables organized by opcode for all of the Z80's instructions.
• The Complete Z80 Table(including all undocumented instructions) (XLS and PDF).
• Decoding Z80 Opcodes- of use to disassembler and emulator writers, by Christian Dinu (NEW!!).
• Z80 Instruction Set, sorted in various ways and combinations:
  • Alphabetically sortedShowing # of T-states and brief explanation of instructions
  • Alphabetically sortedshowing flags affected and brief explanation of instructions
  • Alphabetically sortedShowing # of T-states and size of instructions
  • (
  combination of the three texts mentioned above, including some corrections and supplements, NEW!!.)
  • Alphabetically sorted ( HTML )Explaining Flag Affection
  • Alphabetically sorted ( HTML )Showing # of T-states and telling which flags are affected
  • Z80 instruction breakdown by machine codeSee what's goes on in each machine cycle. Thanks to Alvin and Vaggelis.
  • Z80 loading table, by Piotr S.
• Use one of these lists to disassemble "by hand":
  • Z80 Instruction Set, OpCode # sorted (Hex)
  • Z80 Instruction Set, OpCode # sorted (Hex)
  • Z80 Instruction Set, OpCode # sorted (Hex and Decimal)
  • Complete Opcode List (including undocumented ones)Showing # of T-states, M-Cycles, M1-Cycles
  • The Documented un-documented instructions (PDF)Thanks Sean!
  • Full Z80 Opcode List Including Undocumented OpcodesBy J.G.Harston
  • A Word95 document with all the instruction tablesGood reading here.
  • z80 Opcode to Mnemonic Translator, written in C, by James Ball (currently offline)
  • Z80 opcodes Excel sheet.

Basic Information (Chips' Pinouts)

Basic Information (Circuit Schematics)

• Digital GATESAll about digital gates, truth tables and schematic symbols.
• Crystal Oscillator CircuitHow to make one yourself
• Z80 testerSchematics over the absolute beginner construction with a Z80 CPU.
• Z80 SchematicThis is a system example with PARALLEL, SERIAL, RAM and ROM
• Z80 Schematic (Protel)The schematic above in the original Protel format
• 3 GIFs with Z80 CircuitsZ80 CPU and Memory, CTC, SIO, and drivers for RS-232 interface
• Z80 system circuitZ80 CPU with EPROM, RAM and PIO, by M.Kimura
• Z80 Nascom 1 Main
• Z80 Nascom 1 Video Section
• Z80 system for HAM radioby Emilio
• Z80 systemby Douglas, with flash rom and Z80 PIO
• Z80 Arcade game"Moon Cresta" by Gremlin Industries
• Sinclair ZX Spectrum+3 and +2A by Amstrad plc.,
part1and part2.
Both parts put together in one schematic: parts 1 and 2.

Software Tutorials

• Z80 ASM LessonsDon't get confused by term "ASM86"
• Introduction into Z80 Instruction Setbased on ZINT
• How to program the z80 SIO, by Mario Blunk.
• How to program the z80 CTC, by Mario Blunk.
• I²C programming using the Z80 PIO, by Mario Blunk.

Special Items (Z80)

• My Z80 FAQ, Frequently Asked Questions
• Z80 InformationRead about the R register, undoc + more
• Z80 & Memory chip select ( GIF )
• Z80 & Memory ( TXT )
• Z80 & Reset ( TXT )
• Z80 DRAM Refresh ( TXT )
• Byte saving, conditional RST7 on Z80
• More byte saving code, by Johan Koelman
• Bugs and Errors in Offical Z80 Documentation:
  • Known BUGS ( HTML )
  • Errors in the Official Z80 Documentation
• Undocumented Z80 Opcodes:
  • Z80 Undocumented Instructions
  • Z80 Undocumented InstructionsEffects on flags, by Mark G. Rison
  • Z80 Undocumented InstructionsSome postings
  • Z80 Undocumented OpcodesBy Sean Young
• 8255 PIO Programming info
• Articlesby Jack G. Ganssle, Search and you will find Z80 stuff
• Z80 Special Reset, by Tony Brewer.
• Interrupt Behaviour of the Z80 CPU - Interrupt and reset timing
• Interrupt mode 2 - what happens to bit 0?
• Zilog Application note "Z80 Family Program Interrupt Structure", May 1978 - thanks to John Gill for that.
  • The above document rewritten by Mario Blunk, now in a searchable PDF format.
• barleywood.comGuide to Z80 I/O Programming: The source of the following documents (link points to a mirror at archive.org)
  • Z80 Family Interrupt Structure
  • Serial Communications using RS232
• Reverse engineering ARM1 instruction sequencing, compared with the Z-80 and 6502.
• Down to the silicon: how the Z80's registers are implemented.

Source Code Examples ...

• Z80 SourceSome routines for beginners (source not yet commented)
• Z80 SourceSome routines for the more trained
• Z80 Programming
• PCDN.ZIPPC Download Z80-ASM. Routines for the Z80 SIO Serial port by Dave Baldwin, The Computer Journal
• Z80 Math.zipFloating-Point Math Package for GameBoy or Z80 in Assembler, by Jeff Frohwein
• Math48.zip48 bit floating point mathematical package for Z-80 based microcomputers, by Anders Hejlsberg.
• Z80 ASM.zipA great Z80 ASM package with: 8251 Uart intel hex transfer, LCD drivers, random, forth.
• A system to receive and transmit packets throught a PCM-30 8bit timeslot using a SIO device, by Riccardo Pompeo.
• Pseudo-random number generator, by A.J.Moss.

Source Code Requests from you:

• Z80 Software Request

Chip Distributors

Various useful sites

• Electronic components data sheets
• Free electronics projects, circuits diagrams and schematics
• PDF-XChange Viewer- PDF reader with OCR function.
• Electronic Component Datasheets and Distributor Pricing