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Search Again :: Adv Search 1000 results in 0.021s
<1234567…34>
  • 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…

    ... were possible to replace the lower 16K RAM of a 16K/48K Spectrum with ...
    RetroTechie RetroTechie February 2009 Hardware
  • Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…

    ... it seems to fail the lower 16K memory test.

    Does anyone ...
    bagpuss22 bagpuss22 January 2015 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    I had the same problem (lower 16K memory bad) and tried replacing ... reads / writes to the lower RAM. Snow gone, normal ... memory for a TMS9918 chip).

    To do:
    * Replace ... (if average current is lower)
    * Replace +5 regulator with switching ...
    RetroTechie RetroTechie December 2008 Hardware
  • repaired a 48K, yay :)I just managed to repair one 48K. After socketing all eight lower RAM chips (hard work!) and replacing few of them, it showed the familiar "Sinclair …

    ... tried this myself for the lower (16K memory). The lower 16K of RAM is problematic ... (32-64K) memory area, it's quite easy to replace the DRAM ... best bet. If you do replace them, make sure you fit ...
    RST#08 RST#08 January 2011 Hardware
  • 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…

    ... 48k Speccy - fits in the lower 16k memory bank. They look like NOS ...
    JonB JonB February 2014 Sales
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…

    ... 's also got a 32kb memory expansion, but with or without ... />
    That'll be the lower 16K memory gone. As others will point ...
    csmith csmith November 2007 Sinclair Miscellaneous
  • Some ROM/EPROM questions...I've got a ZX Spectrum +, a +2A and +3 computers, and I've been using +3e project ROMS for a while in my +3. I was thinking about using an EEPROM or…

    ... in and out in the lower 16K memory map by software.

    Winston Winston June 2010 Hardware
  • Issue 2 Speccy faultHi Guys, I'm really hoping someone can help me with a fault that has just developed on my issue 2 speccy. After perservering for some time with usi…

    ... one or more of the lower 16K memory chips shorting. These 4116 ... rest.

    Higher Memory Faults
    These problems often ... To check that the entire memory is operational enter the ... for a 16K model. Any shortfall (lower number) indicates a memory fault.
    Macc Macc December 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... UHF these days).
    [*] Replace lower 16K RAM with an SRAM (because ... that uses it.
    [*] Replace Z80 with faster version + ... or ZXMMC+.
    [*] Replace keyboard foil with new one ... than not).
    [*] Replace 7805 with efficient switching regulator ...
    RetroTechie RetroTechie December 2010 Hardware
  • try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…

    If voltages ok, then 4116 lower 16K memory (most likely) or ROM.

    It's tricky to tell.... Do the 4116's get hot?
    csmith csmith August 2011 Hardware
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... /> Remember that it's only lower 16K memory read/writes that are delayed ... per line there is no memory interference whatsoever, and the CPU ... the screen; synchronising itself with memory writes. You see, you can ...
    joefish joefish August 2019 Development
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... I'd modify some serial memory to a microdrive array, with ... to work even if the lower 16K memory is faulty and the ULA ... tracks I started with a 16K rom, then figured I might ...
    cj7hawk cj7hawk February 2021 Hardware
  • Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…

    ... /> 1. Remove the 16K Spectrum ROM
    2. Replace it with a ... CPU is making a memory access to the lower 16K of address space ...
    Winston Winston August 2012 Hardware
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... RAM ( 16K dual-ported memory ) that maps over the Spectrum lower 16K, and ... of the video memory area ( or, potentially, replace the lower 16kb entirely, ... will have it's own memory, in parallel to the ... In fact, it could probably replace much of the ULA, perhaps ...
    cj7hawk cj7hawk December 2020 Hardware
  • Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…

    ... the circuit - however, those lower 8 memory ICs can often blow and ... on the output before you replace it, or it might just ... an upper memory fault will not stop it booting in 16k mode ... you find the culprit - the lower memory (4116 ICs) will almost certainly ...
    GP GP April 2003 Sinclair Miscellaneous
  • Broken ZX 48kHey all. I have acquired a broken ZX 48k. It looks in good condition - tried the membrane and it is working with my other 48k very well. When you tu…

    ... with one of the memory chips belonging to lower 16K pretty often, but ... . If the -5V is faulty, replace the ZTX650. If the machine ... work properly afterwards, check the lower memory ICs.

    [ This Message ...
    J?rg Pleumann J?rg Pleumann September 2004 Sinclair Miscellaneous
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... bother with eprom. You can replace the ROM by making an ...
    Winston Winston March 2007 Development
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... border color indicates you what memory bank is faulty (which I ... VRAM pages, and some more memory. This bank is contended. The ... features, the memory map you have contains a lower RAM region (16K) which ... performed to the ROM and replace the damaged memory chip.
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…

    ... Spectrum memory model? If you are, then you replace the 16K ram ... with a 64K memory bank (all ... 32K RAM with another 64K memory bank, plus a bit ... in knowing how the lower bank in such a ... is the rest of the memory, so i'm trying ...
    spodula spodula January 2011 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... first thing to do is replace all electrolytic capacitors. 30 ... one! :smile: ). You might replace the 7805 regulator too as ... (especially -5V missing can kill lower 16K chips in short order).
    memory chip(s?) are failing. Depending on results you can replace ...
    RetroTechie RetroTechie October 2012 Hardware
  • Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…

    ... RAM chips that provide the lower 16K of memory require three different supply ... might be faulty - you can replace these with ZTX651/653 (TR4 ... one or more of the lower RAM chips (these are at ... new ones. A modern replacement lower RAM board is also available ...
    balford balford January 2015 Hardware
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... SRAM chip is used to replace the existing ROM, the parasite ... to respond at the Z80 memory cycle timing. Using the Z80 ... try to write to the "lower" 16k RAM area (which contains the ... down loader program into the "lower" RAM, then once the new ...
    1024MAK 1024MAK June 2017 Hardware
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... the contention timing to the lower 16k of memory, since the system uses ... if you think about it... Replace the 64K chips with 256K ... can find an existing extended memory paging system, I'll probably ... always be mapped to the lower memory, but I intend to find ...
    cj7hawk cj7hawk February 2021 Hardware
  • Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…

    ... it would have needed to replace a few items. Like the ... and CGA cards used different memory space and you could install ... were using games in the lower 16K of memory space lol!. Later I ... as addons... Disk, Video, Sound, Memory expansion in 0000 to 4000 ...
    cj7hawk cj7hawk September 2021 Hardware
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... the RAMTOP a bit lower with POKE 16389,n ... lt; 77 (76 and lower) and then do NEW then ... if I didn't have 16k memory pack present). AND
    ... than 3.5k of memory free (RAMTOP lower than ROM + 3 ... the lower
    addresses ? or even a possibility of 16k RamPack ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …

    ... what appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • Adventures in Programmable Logic, Part 1So I have a couple of Xilinx CPLDs, and I've downloaded the Xilinx programmable logic IDE (WebKit ISE, they call it). All 1.2 gigabytes of it. Plus S…

    ... allow memory to be paged in in 4K pages into the lower 16K ...
    Winston Winston October 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... CMOS which has much lower output impedances, and strong ... the registers in the lower 16K and buffers in the ... t need to be memory mapped. This will reduce ... arrange the lower 16K of the Speccy's memory, and it ... much slower than one memory access. However, copying ...
    Winston Winston November 2007 Hardware
<1234567…34>

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HitBox

Word Docs Hits
replace 5.4K 6.2K
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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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