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Search Again :: Adv Search 1000 results in 0.018s
<1…15161718192021…34>
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... . Recall that I had to replace C8 due to snapping off ... some PEEKing in the video memory to see whether the unwanted ... are also stored in the lower RAM.

    You can ...
    1024MAK 1024MAK July 2013 Hardware
  • US Timex-Sinclair 2068 in EuropeWhilst in the States, I convinced a colleague to bid on a Timex-Sinclair 2068. We won the auction with a price much better than in Europe. Next time …

    ... line that replace /ROMCS. This allows the entire 64k internal memory to ... be disabled rather than just the bottom 16k.
    Alcoholics Anonymous Alcoholics Anonymous July 2013 Hardware
  • US Timex-Sinclair 2068 in EuropeWhilst in the States, I convinced a colleague to bid on a Timex-Sinclair 2068. We won the auction with a price much better than in Europe. Next time …

    ... opposed to just the first 16K. Unfortunately as I never owned ... line that replace /ROMCS. This allows the entire 64k internal memory to ... be disabled rather than just the bottom 16k.[/QUOTE ...
    chev chev July 2013 Hardware
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... restart.

    Removed all lower RAM since it was soldered ... , although only working as a 16K machine (or maybe even less ... if I have an upper memory problem also. I shall finish ...
    DEATH DEATH August 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... />
    But I think the memory is interleaved, so I'm ... , replace them with sockets. Then put in half to the lower memory bank ...
    RobeeeJay RobeeeJay August 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    The memory of a 48k Spectrum is ... chips.
    The so called lower RAM (used for the screen ... bit x 16k chips. Each chip covers 16,384 memory locations but ... to use a ROM based memory test program. There are a ...
    1024MAK 1024MAK August 2013 Hardware
  • Old homemade hardware?Hey there, I've been given a bunch of ZX Spectrum stuff, I've mostly fixed the computer, just need a membrane. But what I was wondering is that there…

    ... , it gives me "out of memory" errors quite a bit too ... intermittent DRAM fault (either the 16k "lower" RAM) or...
    [*]"Upper" (as ...
    1024MAK 1024MAK September 2013 Hardware
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... />
    Working in decimal would lower the barrier to entry for ... . A simple pattern search and replace should be all that's ... has a "load binary into memory" facility (and I'll bet ... straight into the Speccy's memory and run it with "USR ...
    u6c87 u6c87 September 2013 Development
  • Linking spectrums - parralel processing is it possible?Was there any way to do this, (excluding disk, tape and microdrives)?

    ... /> You could create some shared memory with 2 48K machines.
    replace with shared RAM/ROM.
    Part of this memory would ... also be done for the 16K ROM area.

    I ...
    Knik Knik September 2013 Hardware
  • Linking spectrums - parralel processing is it possible?Was there any way to do this, (excluding disk, tape and microdrives)?

    ... /> You could create some shared memory with 2 48K machines.
    replace with shared RAM/ROM.
    Part of this memory would ... also be done for the 16K ROM area.

    I ...
    pmsr pmsr September 2013 Hardware
  • The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…

    ... over two of the four 16K video banks because on ... own they'd be 16K and you have to ... a higher framefrate despite the lower clock frequency of the ... and its weirdly arranged display memory - the C64 also has ... explain why it has four 16K video banks? ...how does ...
    Sokurah Sokurah September 2013 Games
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ...
    You can simply replace it with this:
    < ... screen. Maybe some kind of memory allocation?[/QUOTE]
    < ... content is kept compressed in lower memory, and
    ' only ... ' located in contended memory, thus leaving uncontended memory available for
    ...
    Einar Saukas Einar Saukas September 2013 Development
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... 32kB fitted but disabled, as 16k Spectrums. Did they just leave ... circuits detect a low) and lower than 2.2V (which is ... the lower limit they detect a high), the results of memory reads ...
    skagon skagon October 2013 Hardware
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... , then better replace TR4 before you start killing lower memory chips which experiments ...
    roko roko October 2013 Hardware
  • 128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…

    ... one of the four extra 16k banks at 4000h. There are ... in any of the four 16K 'main' pages (or 2 of ... overscan configuration) and memory contention applies to every memory access regardless of ... support for Lower ROMs and a bunch of payable memory mapped hardware ...
    AndyC AndyC January 2014 Games
  • 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 …

    ... I said, I still play 16k/48k games and love them ... wouldn't like to see lower k games disappear or anything ... models. On the 128ks, contended memory is everywhere, interrupted snow makes ... memory layout even more awkward, some ...
    Timmy Timmy March 2014 Development
  • Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …

    ... even tried to fill the memory.... or maybe it actually filled ... from the CPU to the lower RAM. One of them could ... off the machine inmediately and replace TR4.
    mcleod_ideafix mcleod_ideafix March 2014 Hardware
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... an entirely separate, pageable 16K bank. It can obviously ... screen it has to be memory-mapped to the standard ... to writes in the 16K ROM address space rather ... than the 16K ULA/RAM address space? ... are intended for the lower 8K of RAM and ...
    joefish joefish April 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... the normal screen from the lower to the upper 8K half ... 32K on-board in two 16K chunks. It can then listen ... have to sacrifice your upper memory to exploit it.

    joefish joefish 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…

    ... . It is not a full memory test.

    Some faults ... 16k machine, the stack will be in the "top" of the "lower ...
    1024MAK 1024MAK 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…

    ... . It is not a full memory test.

    Some faults ... 16k machine, the stack will be in the "top" of the "lower ...
    Brian Brian April 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... track to isolate the upper memory. It did'n help (maybe ... />
    This also proves the 16K lower memory is working, and this issue ...
    georgedb georgedb May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... ZX has organised its memory: why can I say ... about the whole upper memory and even more specific ... a potential broken upper memory chip, by just checking ... one memory location (i.e. 32768 ... the extended memory, as the lower RAM is 16K and the ...
    georgedb georgedb June 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... something about the whole upper memory and even more specific a ... potential broken upper memory chip, by just checking one ... of the extended memory, as the lower RAM is 16K and the ROM ... is 16K)[/QUOTE]

    balford balford June 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…

    ... /> So need to order the lower memory.
    Have removed a leg ... ://www.ebay.nl/itm/HYB4116P2-16K-x-1-bit-NMOS-Dynamic ...
    Brian Brian June 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…

    ... RAS/CAS signals on each lower RAM chip in turn (pins ... have found the third bad lower memory chip and swapped it.
    memory disabled I am back to having a booting 16k system ... is finding the bad upper memory chips :D

    I ...
    Brian Brian June 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…

    ... found the third bad lower memory chip and swapped it ... memory disabled I am back to having a booting 16k ... is finding the bad upper memory chips :D
    < ... br /> So working ZX Spectrum 16K when I remove IC 23 ... guessing one of the memory chips is holding output ...
    Brian Brian June 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…

    ... =balford;776008]Are all upper memory IC's socketed at this ... same troubleshooting methods as with lower RAM - watching the RAS/CAS ... more dead lower memory soon.
    Guess I will just replace all and ...
    Brian Brian June 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    ... current falls to a much lower value. Hence limiting the fault ... thing, but I had to replace the wires leading to it ... they were heat damaged. From memory nothing else on the board ...
    1024MAK 1024MAK July 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... got one or more faulty lower RAM ICs. It might be ... set of 4116s or the lower RAM module that I sell ... />
    Thanks Zorn, replacing the lower memory would be my next step ... is: is it safe to replace them at this stage or ...
    Spekkie Spekkie August 2014 Hardware
<1…15161718192021…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
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    John Elliott on April 21
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HitBox

Word Docs Hits
replace 5.4K 6.2K
lower 6.4K 7.8K
16k 5.5K 7.7K
memory 21.8K 32.5K

Related Threads

  • Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
  • New memory model: 16K/48KAs earlier suggested in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=32096"]this thread[/URL], there was also Spectrum software that …
  • Upgrading 16k MemoryHi All<br /> <br /> I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flas…
  • 32k memory Italian memory expansionNot mine but its an [URL="http://www.ebay.co.uk/itm/TENKOLEK-32K-RAM-Expansion-Sinclair-ZX-Spectrum-/320861810075?pt=UK_VintageComputing_RL&amp;hash=…
  • Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic.<br /> …
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ?<br /> <br /> Speccy with a 16K sticker on the base.<br /> <br /> Doing a peek 23733 returns…
  • Another hardware question - lower 16k bad?Like in my last question, I am referring to this video from JoulesperCoulomb (https://www.youtube.com/watch?v=IzgCmldm2H4), this time, it is with the…
  • 16k and PEEK 40000 (on a real 16k Spectrum)?Imagine a real 16k Spectrum (without any RAM expansion or circuits fitted). What would I get if I do a PEEK or try to access memory over 32767?<br />…

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