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  • Question about 48K DRAM refreshHi guys. Can anybody tell me how the 48K spectrum refreshes the upper ram. RAS only? CAS before RAS? I've got a bunch of 41256 DRAM that i would lik…

    ... anybody tell me how the 48K spectrum refreshes the upper ram ... to try out in a 48K Spectrum. I've read here ...
    Rorschak Rorschak October 2013 Hardware
  • idea: new gaming interface for ZX Spectrum (48k)First of all, I am not an expert this is just an idea of what I would like to see happening in the modern era of the ZX Spectrum. A compact, small, …

    ... features to your ZX Spectrum (48k):

    - USB ports with ...
    maiki maiki November 2013 Hardware
  • Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …

    ... demo.tap (only works on 48K). The rest of archives are ...
    antoniovillena antoniovillena December 2013 Development
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... saw tonight while fixing a 48K issue 6 board.

    48K board gets shorted. TR4 is ...
    Winston Winston December 2013 Hardware
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... 128K and 14347 on the 48K. The screen bytes are fetched ... 224-128 = 96T on the 48K). Then, the second row of ... 14347+224 = 14571T on the 48K) with the same scheme, and ... ] I once borked up the timing somehow such that it scrolled ...
    Hikaru Hikaru January 2014 Development
  • no color zx spectrum 48k (rubber) composite modI have a problem, I just got my 48k speccy and I am waiting for my keyboard mebrane to arrive, meanwhile I did the composite mod and on startup befor…

    ... problem, I just got my 48k speccy and I am waiting ...
    duro00611 duro00611 January 2014 Hardware
  • 48k Dust Cover proto-typeOk, So BloodBaz asked me if I could come up with a dust cover for his 'Many' 48k Speccys. Well, this is what we've come up with. [URL=https://ima…

    ... cover for his 'Many'
    48k Speccys. Well, this is what ...
    Riggz Riggz January 2014 Sales
  • Quality of component video signals on 48K expansion portHi, What's the quality of the component video signals on the 48K Spectrum expansion port like? Could I directly connect them to three phono sockets…

    ... component video signals on the 48K Spectrum expansion port like?
    mark_k mark_k January 2014 Hardware
  • Spectrum + upgraded and Spectrum 48K case/keyboardHere we have a Spectrum + that says upgraded on the back, it is well used but not for around 15 years or so, but does appear to still fire up so shou…

    ... case and keyboard for a 48K Spectrum photos here together with ...
    Essex Essex January 2014 Sales
  • Weird tv output by spectrum 48kI recently got a spectrum 48k and hooked it up to my tv. After finding channel 36, I get a really weird picture for the spectrum, why is that? Below…

    I recently got a spectrum 48k and hooked it up to ...
    SamTebbs33 SamTebbs33 February 2014 Hardware
  • ZX Spectrum 48K board Issue Two - spider modI have a working Spectrum 48K Issue Two for sale on Amibay. It?s an early version with an ULA 5C102E and the "spider-mod" fitted. [URL="http://www.a…

    I have a working Spectrum 48K Issue Two for sale on Amibay. It?s an early version with an ULA 5C102E and the "spider-mod" fitted.

    [URL="http://www.amibay.com/showthread.php?t=57438"]http://www.amibay.com/showthread.php?t=57438[/URL]
    schombi schombi February 2014 Sales
  • FS: MOSTEK 4116 DRAM for 48k SpeccysHi I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their origin…

    ... 4116 DRAMs here for the 48k Speccy - fits in the lower ...
    JonB JonB February 2014 Sales
  • 48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …

    Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing a few caps. My question is, what behaviour would I expect to see on screen if it was missing?
    Macc Macc February 2014 Hardware
  • ZX Spectrum 48KHi. I am looking for ZX Spectrum 48K (rubber keys) It should be fully working one. I need only main unit. I don?t need PSU or leads. Please, make …

    Hi.

    I am looking for ZX Spectrum 48K (rubber keys)
    It should be fully working one.

    I need only main unit.
    I don?t need PSU or leads.

    Please, make me an offer.

    Thanks!
    Vipered80 Vipered80 February 2014 Wanted
  • 48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …

    I've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working 48k pluses now. :)

    Anyone else come across this?
    owdeuk owdeuk March 2014 Hardware
  • New games - should they be 48K or 128K?Here's a question for new games - which machine should they be developed on? If I write a game for the 48K Spectrum, is it appreciated that it will …

    ... write a game for the 48K Spectrum, is it appreciated that ... will not run on a 48K original Spectrum, which is a ...
    joefish joefish March 2014 Development
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... sure I got the ULA timing 100% right. We know when ... uses early or late CPU timing, please run the btime test ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ... 254 every two lines for 48K sound (at expense of full ... -time.
    ;
    ;+2A timing and 128K timing tested.
    ;Full 16x16 ...
    joefish joefish March 2014 Development
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... Issue 2 Sinclair ZX Spectrum 48K, Upon first powering up the ... chip are. Are there any tests I can carry out to ...
    CornishManicMiner CornishManicMiner March 2014 Hardware
  • Spectrum + 48k-Diagnosing a dead keyboard/membraneJust purchased a Spectrum Plus (48k), and the keyboard was faulty (for example, when I pressed the " key, a 'p' was displayed on screen, and lots of …

    Just purchased a Spectrum Plus (48k),
    and the keyboard was ...
    MetalKitten MetalKitten March 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... modification on an Issue two 48K Spectrum so I made a ...
    rga24 rga24 April 2014 Hardware
  • Learning Machine Code the +2a wayHello again all, I thought I'd ask in this forum as the other categories seem less relevant. I keep re-reading the thread below with the advice given…

    ... it is written for the 48k. There is one great book ... has sound routines for the 48k but my reading level at ... +2A/+3 share the same timing information, sound chip, etc as ...
    sliderules sliderules April 2014 Sinclair Basic
  • Why didnt 48k ingame music work?There were very few games that had ingame 48k music, a couple I can think of were Kung Fu Master and Manic Miner but it always sounded drained and no…

    There were very few games that had ingame 48k music, a couple I can think of were Kung Fu Master and Manic Miner but it always sounded drained and not very good. Did the 48k speccy have an issue with moving graphics and music at the same time?
    spainboy spainboy April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... to fix my old Spectrum 48K.
    Looks like my dad ...
    Brian Brian April 2014 Hardware
  • How to run games from mp3 player to a real 48K machine?Hi! I would like to test the homebrew games that was "released" in 2013. As far as I know there haven't been made any real tapes for these games so …

    ... Spectrum and not on a 48K machine?

    I also ... that are listed for a 48K machine but the games won ...
    NickArrow NickArrow April 2014 Emulators
  • 48k no beeper sound (again!)Got three 48k+ here, all of which have the same exact problem, no sound out the beeper, same problem as detailed [URL="http://www.worldofspectrum.org…

    Got three 48k+ here, all of which have ...
    Macc Macc April 2014 Hardware
  • Interface 1 putting me in 48kHi All, I have a 128 toasty with interface 1 connected to a PC via serial. If I save a basic program using 'SAVE *"b" LINE 10', all is well. If I …

    ... , I end up in the 48k editor and not the 128k ...
    jagman5994 jagman5994 May 2014 Hardware
  • 48k memory dump to 128k???Having problems getting a 48k snapshot to load into 128k mode using ZX Spin. Tried saving 48k memory as a binary file and loading it back in 128k mo…

    Having problems getting a 48k snapshot to load into 128k ... Spin.

    Tried saving 48k memory as a binary file ...
    daveysludge daveysludge May 2014 Development
  • Power connector for 48K SpectrumI need a new power connector for an Issue Two 48K Spectrum board, quite an early one. Where can these things be obtained? Someone must know! There mu…

    I need a new power connector for an Issue Two 48K Spectrum board, quite an early one. Where can these things be obtained? Someone must know! There must have been a load of these sourced for Harlequin projects, and also for Spectrum fixes.
    rga24 rga24 May 2014 Hardware
  • ZX Spectrum 48k / +Hello, Does exist some indestructible keyboard membrane for Speccy 48k, or 48k+ ? I would like to purchase speccy, but I would like to avoid the m…

    ... indestructible keyboard membrane for Speccy 48k, or 48k+ ?

    I would ...
    wlcina wlcina May 2014 Sinclair Miscellaneous
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