Z80.info - SEO Checker

Overview of the SEO Check
Meta information
83% 
Page quality
67% 
Page structure
79% 
Link structure
68% 
Server
45% 
External factors
100% 
SEO Score
Response time
0.02 s
File size
22.50 kB
Words
1831
Media files
1
Number of links
144 internal / 47 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Thomas Scherrer Z80-Family Official Support Page
The length of the page title is perfect. (459 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
Thomas Scherrer Z80-Family Official Support Page
The length of the meta description is perfect. (459 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Server location: Germany
One or more of the specified languages are not ISO standard (en, en-us, de, etc.)
The language is not specified in the HTML markup.
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The character encoding is not specified.
The character encoding is not specified in the HTTP header.
Doctype
(Nice to have)
No doctype markup was found.
Favicon
(Nice to have)
No favicon is linked in the HTML code.

Meta tags

NameValue
titleThomas Scherrer Z80-Family HomePage
keywordsZ80,Z180,Z280,Z380,Programming,Hardware,Software,Utilities,FAQ,Support,CPU,assembler,emulators,simulators,Zilog
descriptionThomas Scherrer Z80-Family Official Support Page
authorThomas Scherrer
changedbyGaby Chaudry

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Page quality

Content
(Critically important)
Some words from the page title are not used within the pages content
These Typos were found:
  • infomation => information
  • gameboy => Game Boy
  • offical => official
  • throught => thought, through, throughout
This page contains 1831 words. That's ok.
25.9% of the text are stop words.
The page contains a listing, which indicates a good text layout.
6 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 20.47 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
This page does not require any JavaScript files.
Bold and strong tags
(Somewhat important)
The following tag is repeated too often: new !!
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
The HTTPS protocol for secure data transmission is not used.

Media list

URLAlt attributeTitle
http://www.z80.info/gfx/logotes4.gifNo alt attribute provided

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H2 Official Support-Page: Hardware - Software - Utilities - FAQ - Docs for Z80-Family
H2 Table-of-Contents:
H3 General Information about Z80-Family
H3 Basic Information (Architecture)
H3 Basic Information (Data Sheets)
H3 Basic Information (Instruction Set)
H3 Basic Information (Chips' Pinouts)
H3 Basic Information (Circuit Schematics)
H3 Software Tutorials
H3 Special Items (Z80)
H3 Source Code Examples ...
H3 Source Code Requests from you:
H3 Chip and Component Distributors
H3 Various useful sites
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are too many external links (47) on this page.
LinkAttributesAnchor text
http://www.z80.info/zopy.htmRead the copyright notice.
http://www.z80.info/contact.htmGaby Chaudry
http://www.z80.info/legal.htmYes I have read the legal info
http://www.z80.info/daten.htmData Privacy Policy
/sharp/z80_glas.htmZ80 8-Bit CPU Formed on Glass Substrate
http://www.z80.info/Anchor General Information about Z80-Family
http://www.z80.info/Anchor Architecture
http://www.z80.info/Anchor Data Sheets
http://www.z80.info/Anchor Instruction Set
http://www.z80.info/Anchor Hardware
http://www.z80.info/Anchor Chip Pinouts
http://www.z80.info/Anchor Circuit Schematics
http://www.z80.info/Anchor Software Tutorials
http://www.z80.info/Anchor Special Items (Z80)
http://www.z80.info/z80os.htmOperating Systems for Z80
http://www.z80.info/z80bus.htmSystem Busses for Z80 Family
http://www.z80.info/z80bms.htmBoards, Modules and Sub-Systems
http://www.z80.info/z80cs.htmComputer Systems
http://www.z80.info/z80gm.htmGame Machines
http://www.z80.info/z80vdt.htmVideo Display Terminals
http://www.z80.info/Anchor Source Offers
http://www.z80.info/Anchor Source Requests
http://www.z80.info/z80r4d.htmRequests for Documents
http://www.z80.info/homebrew.htmProjects, Homebrew z80 systems
http://www.z80.info/z80sdt.htmSoftware Development Tools
http://www.z80.info/z80emu.htmEmulators and I.C.E.
http://www.z80.info/Anchor Chip and Component Distributors
http://www.z80.info/uemsc.htmMiscellaneous and more general Stuff
http://www.z80.info/z80ohp.htmOther's Home Pages with Z80 Stuff
http://www.z80.info/z80m_l.htm(Z80) Mailing Lists you may subscribe to
http://www.z80.info/z80nws.htmUsenet Newsgroups (somewhat) related to Z80
http://www.z80.info/z80mag.htmMagazines for Z80 Users
http://www.z80.info/z80lit.htmLiterature about Z80 (in List Form)
http://www.z80.info/z80books.htmLiterature about Z80 (in Table Form)
http://www.z80.info/Anchor Various useful (not only z80 related) sites
http://www.z80.info/z80cpus.htmZ80 CPU Pictures
http://www.z80.info/z80cpue.htmZilog inside!
http://www.z80.info/z80lives.htmZ80 Lives!
http://www.z80.info/z80brief.htmBrief Description and Introduction to the Z80 CPU
http://www.zilog.com/External Zilog, Inc.
http://www.z80.info/z80382bd.htmZilog Z80382 8-Bit Microprocessor
/zip/ZilogProductSpecsDatabook...Z80 Family Questions & Answers
/gfx/z80block.gifZ80 CPU simplified Block Diagram
http://www.z80.info/z80arki.htmZ80 CPU Architecture Block Diagram
/z80architektur.htmZ80 CPU Architecture Block Diagram ( German )
/gfx/z84c015.gifZ80C015 CPU Architecture Block Diagram ( German )
/zip/z80pps.zipPowerPoint Presentation of the Z80 CPU internal block diagram
http://www.righto.com/2013/09/...External The z80 has a 4-bit ALU
/zip/z80data.zipZ80 CPU DATASHEET (ZIP'ed PDF file)
http://www.z80.info/zip/z80.pdfZilog Z80 CPU (PDF)
/zip/z80b8400.pdfSGS Thompson Z80 CPU Data Sheet (PDF)
/zip/z80b8400_OCR.pdfAnd here's the OCR'd version
/zip/z80cpu_um.pdfZilog Z80 CPU user manual (PDF)
/zip/um0081.pdfZilog Z80 CPU Peripherals user manual (PDF)
/zip/z80ctc.pdfZilog Z80 CTC user manual (PDF)
http://www.z80.info/zip/82c55.zipIntel's 82C55 PPI (Zip'ed PDF file)
http://www.z80.info/zip/16550.zip16C550 and SC16C750 UART (ZIP'ed PDF files)
/zip/z80pio.zipZ80 PIO (ZIP'ed GIF files)
/zip/z80piomn.pdfZ80 PIO User's Guide in PDF format
/zip/z80piomn.docZ80 PIO User's Guide in MS Word 97 format
http://www.zilog.com/docs/z80/...External Z8400/Z84C00 Product Specification
http://www.zilog.com/docs/z80/...External Z8410/Z84C10 Product Specification
http://www.zilog.com/docs/z80/...External Z8420/Z84C20 Product Specification
http://www.zilog.com/docs/z80/...External Z8430/Z84C30 Product Specification
http://www.zilog.com/docs/z80/...External Z8440/Z84C40 Product Specification
http://www.zilog.com/docs/z80/...External ps0182.pdf (65 pages)
http://www.zilog.com/docs/z80/...External dc2992.pdf (27 pages)
http://www.zilog.com/docs/z80/...External Z84C90 Product Specification
http://www.z80.info/z80code.htmIntroduction into Z80 Instruction Set
http://www.z80.info/z80sdt.htmZ80-Interpreter
http://www.z80.info/z80syntx.htmZ80 Assembler Syntax
http://www.z80.info/z80-op.txtZ80 Instruction Set Summary
http://www.z80.info/z80opcod.txtZ80 OpCode Formation Rules
/zip/z80prog.zipZ80 programming guide
http://t.eeems.ca/ASMin28Days/...External Subdomain Learn TI-83 Plus Assembly In 28 Days
http://clrhome.org/table/External Z80 instruction set table
/zip/z80table.zipThe Complete Z80 Table
http://www.z80.info/decoding.htmDecoding Z80 Opcodes
http://www.z80.info/z80inst.txtAlphabetically sorted
http://www.z80.info/z80href.txtText duplicate Alphabetically sorted
http://www.z80.info/z80time.txtText duplicate Alphabetically sorted
http://www.z80.info/z80code.txtcombination of the three texts mentioned above
http://www.z80.info/z80sflag.htmAlphabetically sorted ( HTML )
http://www.z80.info/z80flag.htmText duplicate Alphabetically sorted ( HTML )
http://www.z80.info/z80ins.txtZ80 instruction breakdown by machine code
/zip/Z80-LD-table.pdfZ80 loading table
http://www.z80.info/disz80.txtZ80 Instruction Set, OpCode # sorted (Hex)
http://www.z80.info/opcodes.txtText duplicate Z80 Instruction Set, OpCode # sorted (Hex)
http://www.z80.info/z80inst2.txtZ80 Instruction Set, OpCode # sorted (Hex and Decimal)
http://www.z80.info/z80sean.txtComplete Opcode List (including undocumented ones)
/zip/z80-documented.pdfThe Documented un-documented instructions (PDF)
http://www.z80.info/z80oplist.txtFull Z80 Opcode List Including Undocumented Opcodes
/zip/z80sean.zipA Word95 document with all the instruction tables
http://zoofware.com/z80-opcode...External z80 Opcode to Mnemonic Translator
/zip/z80_opcode.xlsZ80 opcodes Excel sheet
http://www.z80.info/zinout.htmZ8400 CPU
http://www.z80.info/8410.txtZ8410 DMA
http://www.z80.info/z80pio.htmZ8420 PIO
http://www.z80.info/z80ctc.htmZ8430 CTC
http://www.z80.info/z80sio.htmZ8440 SIO
http://www.z80.info/z80dart.htmZ8470 DART
http://www.z80.info/8530.txtZ8530 SCC
http://www.z80.info/cpu280.txtZ80280 MPU
http://oldcomputers.dyndns.org...External Subdomain information about the z280
http://www.z80.info/z80gboy.txtInfo about the GAMEBOY CPU
http://www.z80.info/zip/r800.zipDownload full software doc
http://www.z80.info/zinout.htm8255 PPI
http://www.z80.info/zinout.htm16C550 Serial UART Pinout + info
http://www.z80.info/gfx/eprom.gifEPROM
http://www.z80.info/mostek.htmMostek peripheral chips
http://cratel.wichita.edu/crat...External Subdomain Everything You Always Wanted To Know About GAMEBOY
http://www.righto.com/2014/09/...External Why the Z-80's data pins are scrambled
http://www.z80.info/uegates.htmDigital GATES
http://www.z80.info/uexosc.htmCrystal Oscillator Circuit
http://www.z80.info/z80test0.htmZ80 tester
/gfx/z80test.gifZ80 Schematic
http://www.z80.info/zip/z80-2.zipZ80 Schematic (Protel)
http://www.z80.info/z80core3.htm3 GIFs with Z80 Circuits
http://www.z80.info/z80core4.htmZ80 system circuit
/gfx/nascom1main.gifZ80 Nascom 1 Main
/gfx/nascom1video.gifZ80 Nascom 1 Video Section
/gfx/emilio_sch.gifZ80 system for HAM radio
http://www.z80.info/gfx/jean3.gifZ80 system
http://www.z80.info/z80core5.htmZ80 Arcade game
/gfx/plus31.gifpart1
/gfx/plus32.gifpart2
/gfx/Circuit_diagram_2A_3A.gifparts 1 and 2
http://www.z80.info/lesson1.htmZ80 ASM Lessons
http://www.z80.info/z80code.htmText duplicate Introduction into Z80 Instruction Set
http://www.train-z.de/train-z/...External How to program the z80 SIO
http://www.train-z.de/train-z/...External How to program the z80 CTC
http://www.train-z.de/train-z/...External I?C programming using the Z80 PIO
http://www.z80.info/z80_faq.htmMy Z80 FAQ, Frequently Asked Questions
http://www.z80.info/z80info.htmZ80 Information
/gfx/z80mem.gifZ80 & Memory chip select ( GIF )
http://www.z80.info/z80mem.txtZ80 & Memory ( TXT )
http://www.z80.info/z80reset.txtZ80 & Reset ( TXT )
http://www.z80.info/z80_rfrs.txtZ80 DRAM Refresh ( TXT )
http://www.z80.info/sint.htmByte saving, conditional RST7 on Z80
http://www.z80.info/bytesave.htmMore byte saving code
http://www.z80.info/z80bugs.htmKnown BUGS ( HTML )
http://www.msxnet.org/techExternal Errors in the Official Z80 Documentation
http://www.z80.info/z80undoc.htmZ80 Undocumented Instructions
http://www.z80.info/z80undoc.txtText duplicate Z80 Undocumented Instructions
http://www.z80.info/z80undoc2.txtText duplicate Z80 Undocumented Instructions
http://www.z80.info/z80undoc3.txtZ80 Undocumented Opcodes
http://www.z80.info/z255pro.htm8255 PIO Programming info
http://www.ganssle.com/External Articles
http://www.primrosebank.net/co...External Z80 Special Reset
http://www.z80.info/interrup.htmInterrupt Behaviour of the Z80 CPU - Interrupt and reset timing
http://www.z80.info/interrup2.htmInterrupt mode 2 - what happens to bit 0?
/zip/z80-interrupts.pdfZilog Application note "Z80 Family Program Interrupt Structure"
/zip/z80-interrupts_rewritten.pdfThe above document rewritten by Mario Blunk
http://web.archive.org/web/*/w...External Subdomain barleywood.com
http://www.z80.info/1653.htmZ80 Family Interrupt Structure
http://www.z80.info/1656.htmSerial Communications using RS232
http://www.righto.com/search/l...External Reverse engineering ARM1 instruction sequencing
http://www.righto.com/2014/10/...External Down to the silicon: how the Z80's registers are implemented
http://www.z80.info/z80asm.htmZ80 Source
http://www.z80.info/z80sourc.txtText duplicate Z80 Source
http://www.z80.info/z80prog.htmZ80 Programming
http://www.z80.info/zip/pcdn.zipPCDN.ZIP
http://www.z80.info/zip/math.zipZ80 Math.zip
/zip/math48.zipMath48.zip
/zip/z80asm.zipZ80 ASM.zip
http://www.sixtyfourbit.org/Z8...External A system to receive and transmit packets throught a PCM-30 8bit timeslot using a SIO device
/pseudo-random.txtPseudo-random number generator
http://www.z80.info/z80req.htmZ80 Software Request
http://www.stocknsource.com/External Specialized in hard to find ICs and Semiconductors
http://www.futurlec.com/External Electronic Components and Semiconductors
http://www.futurlec.com/ICZ80S...External Z80 Series Microprocessors
http://www.futurlec.com/Z8_Tra...External Training Boards.
http://www.4starelectronics.com/External Obsolete Electronic Components
http://www.o2xygen.com/parts/i...External Component Image List [Z] page 1
http://www.o2xygen.com/parts/i...External Component Image List [Z] page 2
http://www.o2xygen.com/parts/i...External Component Image List [Z] page 3
http://www.proactivecomponents...External ProActiveComponents
http://www.jameco.com/External Jameco Electronics
http://www.galco.com/External Galco Industrial Electronics
http://www.earthtron.com/External EarthTron LLC
http://www.marchelectronics.com/External March Electronics
https://www.mouser.com/External Mouser Electronics
https://www.peigenesis.com/External PEI-Genesis
http://www.datasheetdir.com/External Electronic components data sheets
http://www.electroniq.net/External Free electronics projects, circuits diagrams and schematics
A-TITLE Electronics Projects, Circuits Diagrams and Schematics
http://www.tracker-software.co...External PDF-XChange Viewer
http://www.datasheets360.com/External Electronic Component Datasheets and Distributor Pricing.
https://www.angieslist.com/art...External Electrical Education: Science Lessons and Activities.
https://www.homeadvisor.com/r/...External Residential Electrical Circuits Explained
http://www.z80.info/Anchor Back to Table-of_Contents
http://www.z80.info/Anchor Back to Top

Server configuration

HTTP redirects
(Critically important)
The checked page does not redirect to another URL.
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time is excellent with 0.02 seconds.
This page does not require any CSS files.
This page does not require any JavaScript files.
The file size of the HTML document is fine (23 kB).

HTTP Response Header

NameValue
dateSun, 18 Oct 2020 20:58:21 GMT
serverApache
upgradeh2c
connectionUpgrade
last-modifiedSat, 01 Aug 2020 13:14:48 GMT
etag"5a2b-5abd0b09d6d27"
accept-rangesbytes
content-length23083
content-typetext/html
statuscode200
http_versionHTTP/1.1

External factors

Blacklists
(Critically important)
This website is not classified "for adult only".
This website is not listed on the Shallalist.
This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 689 referring domains.
This page has 35,865 backlinks.
This page has backlinks from 631 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares, comments and likes on Facebook.
Listed on Webwiki
(Nice to have)
This website is listed on Webwiki.

Search preview

www.z80.info
Thomas Scherrer Z80-Family Official Support Page
Thomas Scherrer Z80-Family Official Support Page

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Z8082%Check
Z80 family76%Check
family70%Check
Z80-Family70%Check
Z80 Instruction64%Check
Z80-Family Official Support63%Check
Zilog Z8062%Check
Official62%Check
page61%Check
Z80 Documentation60%Check

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