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<1…14151617181920…34>
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... />
    [QUOTE=kamilb1998;601859]
    Lower memory bank;
    IC6 pin 1 ... ULA is /CAS for the lower RAM and attaching a voltmeter ... the power supply from the lower RAM, either by cutting the ... have gone bad or just replace the lot. They only sometimes ...
    Zorn Zorn February 2012 Hardware
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... one and replace all the caps, chances are some lower memory is also ... a recom off guesser to replace that regulator and do away ...
    Macc Macc February 2012 Hardware
  • ZX81 Internal Memory UpgradeAnyone here ever done it? Im looking to add 16k of internal memory, pretty sure I know how to do it, just what parts do I need? (and where to get t…

    ... of my ZX81's - just 16K because you can do that ... ZX81 software works nicely on 16K ([I]most[/I] software meant ...
    RetroTechie RetroTechie March 2012 Sinclair Miscellaneous
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... to use a SIMM memory module to replace 4116 DRAM's.
    lower-memory/12-a-direct-wired-prototype ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • 48k Speccy chucks a wobblerI've got a problem with my rubber keyed 48k speccy. When it is first switched on everything is fine but after a couple of minutes the picture on scr…

    ... as if the contents of lower memory are becoming corrupted. Once the ... The problem could be the lower RAM ICs themselves, though usually ... switching transistors and consequently the lower RAM too. If this Spectrum ... probably a good idea to replace them all anyway.
    Zorn Zorn March 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... . It's usually wise to replace all the original electrolytic capacitors ... /> I'm recalling those from memory, so I hope I haven ... of the readings is significantly lower, then something that connects between ...
    Zorn Zorn April 2012 Hardware
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... , so I can boot into 16K mode and perform test using ... , this ROM doesn't use lower memory at all (except for image ... can boot a Spectrum with lower RAM bad chips. System variables ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... the moment the ROM's memory test code worked on the ... step a. I confirmed the lower RAM (IC13) was not at ... then initialised properly as a 16K system. Hurrah!

    Sadly ... IC22 still resulted in a 16K Spectrum. POKE and PEEK in ...
    Zorn Zorn April 2012 Hardware
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... they were going to implement memory bankswitching. The method they seemed ... ULA, and fully decoding the lower byte of all the I ... much more suitable size than 16K and having them available across ...
    chev chev May 2012 MIA/STP/SDP
  • Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …

    [QUOTE=RetroTechie;636321]Lower RAM checking is a matter of replace chips, or ... by the ROM's initial memory test then it's usually ...
    Zorn Zorn June 2012 Hardware
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... custom ROM in the first 16K and 16K of RAM at 0x4000 ... the 8K ROM and replace the Timex 16K ROM with a self ... -contained 16K ROM. But having done that ... -Res mode, AY sound chip, memory banks, new commands... way ahead ...
    chev chev August 2012 Sinclair Basic
  • Successfully updated Issue 2 48k to 128k?Thanks to the donation by PMSR and through the very patient teachings of Velesoft, I have updated the Issue 2 to work with 128k. However. I have yet …

    ... at detail of the modified memory map of this arrangement, I ... on, the lower DRAM is just used for the 16k to 32k ... A7 (VRAM A7) of the lower DRAM as the Z80 is ...
    1024MAK 1024MAK August 2012 Hardware
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    ... memory modules for lower ram. Which is why I now try to replace ...
    Johan1973 Johan1973 September 2012 Hardware
  • New Spectrum +2 owner, got problems!Hi everyone, I'm new to the Spectrum scene having grown up a C64 user, I was offered a Spectrum +2a for ?20 with no software. I decided since the div…

    ... next place to look is memory problems. However, if the Speccy ... no DivIDE connected at all) lower memory is probably working fine (which ... your problem if Deathchase - a 16K game - fails to load), but ... course doesn't rule out memory problems - there are types ...
    Winston Winston September 2012 Hardware
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... bytes are now at memory address 33000 by ... = 'enable interrupts'
    Replace line 3 with 'di'. Insert ... /> Delete line30 and replace with the following code ... the car position.
    Replace line 43 with the following ... If it is odd, lower the road position in ...
    buzzy buzzy September 2012 Development
  • BRAND NEW VTX 5000 MODEMSI have for disposal a number of BRAND NEW BOXED PRISM VTX 5000 Modems If tou would like to add one or more VTX 5000 modems to your Sinclair ZX Colle…

    ... specified block of
    memory, so allowing for files etc ... br /> position (silver switch) and replace their telephone
    handsets. From ... areas are 28000 - 32000 on 16k version and
    60000 - ... br /> RANDOMIZE USR 28000 on 16k version
    RANDOMIZE USR ...
    thelasernut thelasernut September 2012 Sales
  • 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…

    ... we are only testing one memory cell here, so I will ... work in 16K mode?

    I will indeed replace the caps ...
    vext01 vext01 October 2012 Hardware
  • Query about memorySo I know this has been asked a lot and I beg your brief indulgence. I have scanned through a lot of old threads already but I'm trying to improve m…

    ... always memory, address decoder chips may be also faulty, resulting in 16k ... , so not so easy to replace.
    ZX Spectrum is really ...
    kpuchatek kpuchatek October 2012 Hardware
  • Faulty French +2 grayA friend of mine has a faulty french +2 grey model. The picture its giving out is this... [URL=http://imageshack.us/photo/my-images/19/post2036357600…

    This is certainly a memory fault - but to its cause ... clearly a fault with the lower-half of ram. if not ... will most likely have to replace some of the RAM chips ...
    Zetr0 Zetr0 January 2013 Hardware
  • Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…

    ... try and work with just 16K to run everything. It' ... in at the bottom of memory; only at the top ... library unpacker in the middle 16K and unpack the necessary ... take up a lot of memory. Add that to a ... memory since it'll mostly be running in uncontended time (lower ...
    joefish joefish February 2013 New game ideas
  • Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…

    ... the 16K -> 48K extension (IC15-IC22), only half the memory is ... you just swapped. If you replace multiple chips at once and ... that's more trouble than replace chip-by-chip.

    RetroTechie RetroTechie March 2013 Hardware
  • Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…

    ... the 16K -> 48K extension (IC15-IC22), only half the memory is ... you just swapped. If you replace multiple chips at once and ... that's more trouble than replace chip-by-chip.

    xaris_sm xaris_sm March 2013 Hardware
  • ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…

    ... 's needed in terms of memory;

    * The first original ... be completely redone with a lower amount of tiles. Luckily there ... then replace all the tiles one by one with the lower-number ...
    Sokurah Sokurah March 2013 New game ideas
  • Sixword SwiftdiskI just got hold of a Sixword Swiftdisk interface, which seems to be a very interesting piece of hardware. It looks almost identical to an IF1, can co…

    ... /> It should be possible to replace a 2.3 ROM with ... 2.4 ROM and a 16K 3.4 ROM. (The 2 ... appears to have the same 16K twice).

    If you ... 32K of ROM, but some memory-mapped accesses in the ROMs ...
    Jmk Jmk April 2013 Hardware
  • SAM Coupe - a video problemHi mates. Lately I managed to acquire a SAM Coupe 512K. There are, however, certain problems that - I thought - You might help me with, in a mome…

    ... one or both of the lower DRAM is faulty. If ... is broken and if I replace them with those from 256K ... you would still need to replace those DRAM that you had ... use any of it's memory for the video display, ... if the SAM then uses lower memory for video.

    ...
    Quazar Quazar April 2013 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    ... were 4 out of 8 memory ICs in the uncontended bank ... regulator 78S05 and TR8/TR9 (replace them)

    critical RAM ... try to start system on 16k mode

    what exactly ...
    xaris_sm xaris_sm April 2013 Hardware
  • Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…

    ... And what about accessing memory? DRAM memory installed in the ... cycles, though). Either you replace that memory with faster equivalents, or ... down the processor when performing memory cycles.[/QUOTE]
    ... better machine now, for lower price and all open-source ...
    Alone Coder Alone Coder June 2013 Development
  • 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…

    ... /> Have just ordered a 4116 lower memory replacement module from Zorn, so ... I can go ahead and replace the capacitors as well. Voltages ...
    Trafferth Trafferth June 2013 Hardware
  • 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…

    ... a similar board to replace the non contended memory bank?

    lower-memory/13-making-it-pretty[/url ...
    mcleod_ideafix mcleod_ideafix July 2013 Hardware
  • 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…

    ... a similar board to replace the non contended memory bank?[/QUOTE]
    lower RAM faults. Perhaps because they ...
    Zorn Zorn July 2013 Hardware
<1…14151617181920…34>

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  • 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…
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  • 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…
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  • 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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