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  • Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…

    ... add an interface/expansion (that is not a 32k RAM pack), it ...
    1024MAK 1024MAK January 2016 Hardware
  • How R@RE was the 16k Speccy?I'm curious about the ratio of 16K to 48K models sold - the 16K seems to be a pretty rare beast these days. All the people I knew who had 16K Speccys…

    ... little industry existed for ZX81 RAM packs, so of course there ... were various 32k RAM packs for 16k ZX Spectrums ... party suppliers made internal 32k expansion packs (in the case of ...
    1024MAK 1024MAK March 2016 Hardware
  • SpecNextThis looks interesting... http://www.specnext.com/

    512Kb RAM
    ULA+
    SD card ... & ear sockets
    Original expansion bus port
    Accelerator slave ...
    Strident Strident April 2016 Sinclair Miscellaneous
  • SpecNextThis looks interesting... http://www.specnext.com/

    ... the Next’s expansion port, and monitor the video RAM area for ...
    RMartins RMartins June 2016 Sinclair Miscellaneous
  • SpecNextThis looks interesting... http://www.specnext.com/

    ... the Next’s expansion port, and monitor the video RAM area for ...
    TomD TomD June 2016 Sinclair Miscellaneous
  • DivIDEMy experience with DivIDE over a period of 3 years has been far from happy. DivIDE successfully runs about 20% of files on my +2a and many files e…

    ... the expansion port edge-connector) can and does suffer from "RAM pack ...
    1024MAK 1024MAK July 2016 Hardware
  • Question - SAMS Timex Sinclair 2068 Beginner/Intermediate GuideHi all, I just acquired a T/S 2068 and the a book that came with it is, SAMS Timex Sinclair 2068 Beginner/Intermediate Guide. On page 18 of thi…

    ... is because there is less RAM available for Basic in the ... the system variables for future expansion and pushes the channels area ...
    Alcoholics Anonymous Alcoholics Anonymous August 2016 Hardware
  • 48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…

    ... the "upper" 32k bytes of RAM, you need eight chips, ... , you lose 32k bytes of RAM.

    There ... "upper" 32k bytes of RAM, but either LK3 or LK4 ... with non-functional "upper" RAM as 16k byte machines. It ... mid-use of an an expansion/interface on the edge- ...
    1024MAK 1024MAK August 2016 Hardware
  • What to buy +2, +2A, +2B, +3??Hi all I've always wanted to buy a 128k Spectrum and I've seen some lately in eBay going for cheap. The 128K+ is expensive I understand because of…

    ... someone needs to make an expansion to turn your 48k into ... as is possible from an expansion plugged into the edge-connector ... extra RAM :-)
    What can't be done by an external expansion ... is to give the ULA access to any additional RAM ...
    1024MAK 1024MAK October 2016 Hardware
  • What could've happened to this Spectrum?Just some speculation here. I picked up +2 grey recently, and have been wondering what work may have been done on it, as it has an 'ace repairs' war…

    ... , pulling out an interface or expansion, or plugging one in while ... control bus lines :(. This includes RAM, CPU , and ULA chips.
    RAM chip that failed on it ... own. There were many compatible RAM chips that functioned the same ...
    1024MAK 1024MAK October 2016 Hardware
  • Why do we have to live with colour clash on the Spectrum Next - if it ever gets sold!I can fully sympathize with those who would like to see a 'new' Spectrum, presumably modelled on the last and best version with perhaps the option to…

    ... 7Mhz modes
    Memory: 512Kb RAM
    Video: ULAplus featuring expanded ... saving
    Expansion: Original external bus expansion port and accelerator expansion port
    Accelerator board: GPU / 1Ghz CPU / 512Mb RAM
    BiNMaN BiNMaN November 2016 Chit chat
  • help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…

    Sounds like a "lower" RAM fault.
    It's unusual ... you have.

    An expansion that can replace the Spectrum ...
    1024MAK 1024MAK December 2016 Hardware
  • can a backup device damage the spectrum ROM?as above. been using a specmate device which seems to have corrupted my speccys ROM.

    ... fine), the other the lower RAM.[/quote]
    Keep in mind ... same time, if an interface / expansion is removed or fitted while ... , any device (Z80, ULA, ROM, RAM) can potentially be damaged... So ... and which has a comprehensive RAM test program, even better if ...
    1024MAK 1024MAK January 2017 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... /EEPROM/flash memory). A RAM test program running from ROM ... does not rely on the RAM, so will work even ... if all available RAM has problems. It can ... to work out what the RAM fault is.

    expansion. But there are others.< ...
    1024MAK 1024MAK January 2017 Hardware
  • What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…

    ...
    - 80K RAM (64K of Upper RAM available) allowing 16K for ...
    - 1 x Edge connector expansion slot

    - DE- ... br />
    - 128K base RAM up to 512K internally expandable ... of an additional external RAM extended module mimicking the ...
    retrogod retrogod January 2017 Sinclair Miscellaneous
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... speculated about replacing the internal RAM with a 2MB memory module ... attaching a "hat" expansion unit to the expansion port on the Zx ... literally just fits on the expansion port. He is already ... selling these expansion units for about 25 Euro ...
    kgmcneil kgmcneil February 2017 Hardware
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... />
    [b]Memory: 512Kb RAM (expandable to 1.5Mb internally ... externally):[/b] 512kb of RAM will allow you to ... br /> [b]Expansion: Original external bus expansion port and accelerator expansion port:[/b ... GPU / 1Ghz CPU / 512Mb RAM:[/b] This is enough for ...
    Black_Cat Black_Cat May 2017 Sinclair Miscellaneous
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... at least 1.5Mb of RAM.
    [/quote]

    A ... ]
    [b]Expansion: Original external bus expansion port and accelerator expansion port:[/b ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Sinclair Miscellaneous
  • SD Card Interfaces for the ZX Spectrum : the complete list OK I admit it : this thread will start life as the incomplete list of SD card interfaces but the aim is to list the lot

    ... Spectrum (48,128,+2,+3) expansion device that features the combined ... .
    - Non-volatile 128 KB RAM drive, for application that need ...
    Dan Antohi Dan Antohi June 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... 't already have a suitable expansion interface, is to buy the ... use it to test the RAM in your Spectrum.

    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... IC22, 32k bit DRAM, expansion/"upper" RAM (machine will start without it ... )
    IC23, to IC26 controls expansion ... /"upper" RAM (machine will start without it ...
    1024MAK 1024MAK August 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... test ROM can test the RAM and indicate using coloured stripes ... border which RAM chips tested bad.

    Alternatively any expansion/interface ...
    1024MAK 1024MAK August 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... hardly (unless killed by an expansion being connected or disconnected on ... the ULA that reads the RAM is faulty, the CPU should ... write to the 4116 "lower" RAM. So when it detects a ...
    1024MAK 1024MAK August 2017 Hardware
  • Spectrum repairs[edit - sorry! wrong section, if someone can move please] I'm in contact with a seller on Gumtree. He was selling a 48k Spectrum, fully boxed and…

    ... a fault with the lower RAM (could be just a single ... could also be that the RAM fault took out the DC ... turn killed more of the RAM. Or the Z80 CPU could ... it could be that an expansion/interface was removed or plugged ...
    1024MAK 1024MAK August 2017 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... answer With 2048 K RAM , the expansion board and the WIFI module ...
    harriusherbartio harriusherbartio September 2017 Hardware
  • What's going on inside this ZX Spectrum? [Newbie]Hello folks Last year I got hold of a ZX Spectrum. At the time it appeared to boot up fine, but more recently when I've tried to boot up I've had…

    ... the fault by using an expansion that has a test program ... does not need any working RAM to function. Then as long ... test program can check the RAM and a lot of the ...
    1024MAK 1024MAK October 2017 Hardware
  • Custom Menus on the ZX Spectrum +3Today, my Friends, i have the pleasure of presenting a program i have written which gives a set of custom menus on the +3. The main features of my p…

    ... 16 K-bytes from the RAM Disk, my creative, if somewhat ... , leaving only 26K on the RAM Disc. X_X [/quote]
    Oh ... i added in for future expansion :))
    I guess i'll ...
    The_Bert The_Bert October 2017 Sinclair Basic
  • Spectrum +2 grey ear mod?Is it possible to turn the sound port on the back of a grey Spectrum +2 into an ear input? I know it's possible for the black +2 but I can't find muc…

    ... hardware can map ROM and RAM throughout the Z80 CPU address ... CPU instruction fetches, instead the RAM containing the display data (which ... is lower in the RAM) must respond to CPU instruction ... expansion designs allow a ZX81 to have more than 64k of RAM ...
    1024MAK 1024MAK November 2017 Hardware
  • Third-party ZX81 RAM packsOne of the things that's previously held me back from fishing for a ZX81 on eBay - other than "will the ULA on this machine sold as 'untested' be com…

    I have a Panda ram pack and although it looks ... some equivilant) and has an expansion for an additional 16k via ...
    moggy moggy November 2017 Hardware
  • Third-party ZX81 RAM packsOne of the things that's previously held me back from fishing for a ZX81 on eBay - other than "will the ULA on this machine sold as 'untested' be com…

    ... ;927806"]I have a Panda ram pack and although it looks ... some equivilant) and has an expansion for an additional 16k via ...
    1024MAK 1024MAK November 2017 Hardware
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Latest Posts

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expansion 1.9K 2.3K

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