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Z80 programming help

Discussion in 'Microcontrollers, Programming and IoT' started by Thedarkb, Sep 7, 2013.

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  1. Thedarkb

    Thedarkb

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    Sep 7, 2013
    Hello, I'm wondering if there's any way to modify the onboard ram on the z80 chip externally is it possible? and if so what pins do i use?
     
  2. Raven Luni

    Raven Luni

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    Oct 15, 2011
    Dam - I got all excited there expecting a good Z80 topic :(
     
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Hello and welcome to the Electronics Point forums :)

    AFAIK the Z80 doesn't have any on-board RAM - unless you consider the registers to be RAM! Perhaps you're talking about some Z80-based device that has on-board RAM? If so, tell us the name of it, and look in its data sheet. If it's less than 15 years old it may have some kind of debugging feature like JTAG or similar, which may support modifying RAM. If not, you're probably out of luck.
     
  4. Thedarkb

    Thedarkb

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    Sep 7, 2013
    Thanks, the chip has 256 bytes if internal ram like all z80s and i'll check the datasheet see if it is possible.
     
  5. p.erasmus

    p.erasmus

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    Jul 18, 2013
    This topic brings a qustion to my mind
    How many people still use these Z80 types to me it seems they are out of the stone age ,Are they still useful for todays applications?
     
  6. Raven Luni

    Raven Luni

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    Oct 15, 2011
    Z80s are single CPUs and do not have on-chip RAM or peripherals, You must be referring to a development board or something. A quick search turns up H-Z80 and Zboard as the top results - one of those perhaps?

    You kids are spoiled these days :p The Z80 will rock for all time! I have 10 of them which I plan to use soon :p
     
  7. p.erasmus

    p.erasmus

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    Jul 18, 2013

    Yea We might be spoiled however did not see much about them going around in the last few years.
    I think the world has move on some how
     
  8. Raven Luni

    Raven Luni

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    Oct 15, 2011
    Theyre used internally in alot of common devices including hard drives ;)
     
  9. p.erasmus

    p.erasmus

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    Jul 18, 2013
    Thanks for the info sure helps to realize that they are still used quite often
     
  10. Solidus

    Solidus

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    Jun 19, 2011
    Yep. They're also used in a lot of simple projects as the lack of standardized bussing protocols that exist in newer chips at the time meant that connecting peripheral chips such as RAM or UART converters (things like that) were a lot easier.

    Z80 had an address bus and a data bus. Get out of my way, PCIe, 4MHz and 8bits should be good enough for anyone.

    Hence why Z80/8080 projects use schematics, not block diagrams, and you don't have to wade through a multi-volume, 750-page datasheet to understand how to use them.

    There's many documented SBCs using Z80s, although I'm rather ashamed of myself for never having the real want to build one.
     
  11. gorgon

    gorgon

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    Jun 6, 2011
    Some 25+ years ago I used several of the Zilog chips, and they are great. Z80 both NMOS and CMOS, Z8 microcontrollers in different variants, and the SUPER8 microcontroller. I simply loved the SUPER8, a great microcontroller, the best I've ever used, but with a sadly short lifetime.
    Z80 is a great workhorse in many products and in several variants.
     
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